25 results on '"Tuula Puhakainen"'
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2. Acknowledgement of referees
- Author
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Tuula Puhakainen
- Subjects
Agriculture ,Agriculture (General) ,S1-972 - Abstract
Agricultural and Food Science expresses its sincere thanks to the following referees for their constructive critical reviews of one or more manuscripts during the year 2022.
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- 2023
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3. Acknowledgement of referees
- Author
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Tuula Puhakainen
- Subjects
Agriculture ,Agriculture (General) ,S1-972 - Abstract
xxx
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- 2022
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- View/download PDF
4. Acknowledgements
- Author
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Tuula Puhakainen
- Subjects
Agriculture ,Agriculture (General) ,S1-972 - Abstract
Acknowledgements
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- 2021
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5. Acknowledgements
- Author
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Tuula Puhakainen
- Subjects
Agriculture ,Agriculture (General) ,S1-972 - Abstract
Acknowledgement
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- 2020
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6. Acknowledgements
- Author
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Tuula Puhakainen
- Subjects
Agriculture ,Agriculture (General) ,S1-972 - Abstract
Agricultural and Food Science expresses its sincere thanks to the referees for their constructive critical reviews of one or more manuscripts during the year 2018.
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- 2019
- Full Text
- View/download PDF
7. Acknowledgements
- Author
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Tuula Puhakainen
- Subjects
Agriculture ,Agriculture (General) ,S1-972 - Abstract
Agricultural and Food Science expresses its sincere thanks to the following referees for their constructive critical reviews of one or more manuscripts during the year 2017.
- Published
- 2018
- Full Text
- View/download PDF
8. Acknowledgements
- Author
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Tuula Puhakainen
- Subjects
Agriculture ,Agriculture (General) ,S1-972 - Abstract
Agricultural and Food Science expresses its sincere thanks to the referees for their constructive critical reviews of one or more manuscripts during the year 2016.
- Published
- 2017
- Full Text
- View/download PDF
9. Acknowledgements
- Author
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Tuula Puhakainen
- Subjects
Agriculture ,Agriculture (General) ,S1-972 - Abstract
Acknowledgements to the referees and a member of Advisory Board
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- 2016
- Full Text
- View/download PDF
10. Acknowledgements
- Author
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Tuula Puhakainen
- Subjects
Agriculture ,Agriculture (General) ,S1-972 - Abstract
Agricultural and Food Science expresses its sincere thanks to the following referees for their constructive critical reviews of one or more manuscripts during the year 2014.
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- 2015
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11. Author Correction: Genome sequencing and population genomic analyses provide insights into the adaptive landscape of silver birch
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Balamuralikrishna Jayaprakash, Kurt V. Fagerstedt, Jorma Vahala, Saijaliisa Kangasjärvi, Courtney A. Hollender, Moona Rahikainen, Peter J. Gollan, Tiina Blomster, Ville Pennanen, Alexey Shapiguzov, Matti Rousi, Adrien Gauthier, Sirpa Kärenlampi, Raili Ruonala, Timo Sipilä, Mikael Brosché, Leila Kauppinen, Juan de Dios Barajas-López, Tuula Puhakainen, Kirk Overmyer, Airi Lamminmäki, Omid Safronov, Ari Pekka Mähönen, Kean-Jin Lim, Annikki Welling, Ykä Helariutta, Martin Lascoux, Colin T. Kelleher, Ali Amiryousefi, Katriina Mouhu, Fred O. Asiegbu, Johanna Leppälä, Ülo Niinemets, Pezhman Safdari, Pauliina Halimaa, Sari Kontunen-Soppela, Gugan Eswaran, Pekka Heino, Juan Antonio Alonso Serra, Fuqiang Cui, Juha Mikola, Jarkko Salojärvi, Lidia Vetchinnikova, Sacha Escamez, Hiroaki Fujii, Daniel Blande, Juha Immanen, Péter Poczai, Viivi Ahonen, Alan H. Schulman, Pasi Rastas, Chris Dardick, Matleena Punkkinen, Kristiina Himanen, Jaakko Tanskanen, Christiaan van der Schoot, Sanna Ehonen, Elina Oksanen, Anna Kärkönen, Victor A. Albert, Suvi Sutela, Olli-Pekka Smolander, Lee Macpherson, Michael Wrzaczek, E. Tapio Palva, Maija Sierla, Boy J.H.M. Possen, Juhana Kammonen, Sitaram Rajaraman, Paula Elomaa, Tianying Lan, Enjun Xu, Olga Blokhina, Suvi K. Broholm, Kaisa Nieminen, J. Patrik Koskinen, Jaakko Kangasjärvi, Risto Hagqvist, Lars Paulin, Arja Tervahauta, Aleksia Vaattovaara, Andriy Kovalchuk, Leila Pazouki, Petri Auvinen, Teemu H. Teeri, Department of Plant Molecular Biology, Université de Lausanne (UNIL), SUNY Buffalo, Dept Biol Sci, Buffalo, NY 14260 USA, Université Paris Diderot - Paris 7 (UPD7), Department of Zoology [Cambridge], University of Cambridge [UK] (CAM), Ecophysiologie Végétale, Agronomie et Nutritions (EVA), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut National de la Recherche Agronomique (INRA), Division of Plant Physiology, University of Helsinki, Plante - microbe - environnement : biochimie, biologie cellulaire et écologie (PMEBBCE), Etablissement National d'Enseignement Supérieur Agronomique de Dijon (ENESAD)-Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Molecular Plant Biology, University of Turku, University of Turku, University of Eastern Finland, Department of Forest Sciences [Helsinki], Faculty of Agriculture and Forestry [Helsinki], University of Helsinki-University of Helsinki, Estonian University of Life Sciences, Viikki Plant Science Centre (ViPS), Faculty of Biological and Environmental Sciences [Helsinki], Natural Resources Institute Finland, University of Oulu, Department of Ecology and Genetics [Uppsala] (EBC), Uppsala University, Department of Biological Sciences [Buffalo], University at Buffalo [SUNY] (SUNY Buffalo), State University of New York (SUNY)-State University of New York (SUNY), Institut National de la Recherche Agronomique (INRA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU), Centre National de la Recherche Scientifique (CNRS)-Université de Bourgogne (UB)-Institut National de la Recherche Agronomique (INRA)-Etablissement National d'Enseignement Supérieur Agronomique de Dijon (ENESAD), Estonian University of Life Sciences (EMU), and Natural resources institute Finland more...
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Mutation rate ,Fitness landscape ,Population ,Adaptation, Biological ,Mistake ,Computational biology ,Biology ,Polymorphism, Single Nucleotide ,DNA sequencing ,Interpretation (model theory) ,[SDV.GEN.GPL]Life Sciences [q-bio]/Genetics/Plants genetics ,03 medical and health sciences ,0302 clinical medicine ,Gene Duplication ,Genetics ,Author Correction ,education ,Betula ,Finland ,Phylogeny ,ComputingMilieux_MISCELLANEOUS ,Plant Proteins ,030304 developmental biology ,Population Density ,0303 health sciences ,education.field_of_study ,[SDV.GEN]Life Sciences [q-bio]/Genetics ,[SDV.GEN.GPO]Life Sciences [q-bio]/Genetics/Populations and Evolution [q-bio.PE] ,Notice ,Published Erratum ,Genetics, Population ,Genome, Plant ,030217 neurology & neurosurgery - Abstract
Silver birch (Betula pendula) is a pioneer boreal tree that can be induced to flower within 1 year. Its rapid life cycle, small (440-Mb) genome, and advanced germplasm resources make birch an attractive model for forest biotechnology. We assembled and chromosomally anchored the nuclear genome of an inbred B. pendula individual. Gene duplicates from the paleohexaploid event were enriched for transcriptional regulation, whereas tandem duplicates were overrepresented by environmental responses. Population resequencing of 80 individuals showed effective population size crashes at major points of climatic upheaval. Selective sweeps were enriched among polyploid duplicates encoding key developmental and physiological triggering functions, suggesting that local adaptation has tuned the timing of and cross-talk between fundamental plant processes. Variation around the tightly-linked light response genes PHYC and FRS10 correlated with latitude and longitude and temperature, and with precipitation for PHYC. Similar associations characterized the growth-promoting cytokinin response regulator ARR1, and the wood development genes KAK and MED5A. more...
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- 2019
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12. Genome sequencing and population genomic analyses provide insights into the adaptive landscape of silver birch
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Airi Lamminmäki, Colin T. Kelleher, Petri Auvinen, Olga Blokhina, Peter J. Gollan, Jaakko Kangasjärvi, Pekka Heino, Hiroaki Fujii, Suvi K. Broholm, Mikael Brosché, Adrien Gauthier, Victor A. Albert, Juhana Kammonen, Suvi Sutela, Leila Pazouki, Olli-Pekka Smolander, Paula Elomaa, Tianying Lan, Ykä Helariutta, Sitaram Rajaraman, Risto Hagqvist, Ali Amiryousefi, Péter Poczai, Maija Sierla, Viivi Ahonen, Jorma Vahala, Fred O. Asiegbu, Enjun Xu, Leila Kauppinen, Jarkko Salojärvi, Ülo Niinemets, Sari Kontunen-Soppela, Alan H. Schulman, Arja Tervahauta, Aleksia Vaattovaara, Kristiina Himanen, Lars Paulin, Johanna Leppälä, E. Tapio Palva, Annikki Welling, Jaakko Tanskanen, Juha Mikola, Daniel Blande, Raili Ruonala, Teemu H. Teeri, Christiaan van der Schoot, Sanna Ehonen, Kaisa Nieminen, Fuqiang Cui, Kurt V. Fagerstedt, Katriina Mouhu, Michael Wrzaczek, Pezhman Safdari, Gugan Eswaran, Andriy Kovalchuk, Elina Oksanen, Lee Macpherson, Pauliina Halimaa, Anna Kärkönen, Kean-Jin Lim, Balamuralikrishna Jayaprakash, J. Patrik Koskinen, Chris Dardick, Matleena Punkkinen, Saijaliisa Kangasjärvi, Juan de Dios Barajas-López, Pasi Rastas, Ari Pekka Mähönen, Courtney A. Hollender, Tiina Blomster, Timo Sipilä, Lidia Vetchinnikova, Tuula Puhakainen, Moona Rahikainen, Sirpa Kärenlampi, Omid Safronov, Ville Pennanen, Alexey Shapiguzov, Matti Rousi, Sacha Escamez, Juha Immanen, Kirk Overmyer, Martin Lascoux, Juan Antonio Alonso Serra, Boy J.H.M. Possen, Department of Plant Molecular Biology, Université de Lausanne (UNIL), SUNY Buffalo, Dept Biol Sci, Buffalo, NY 14260 USA, Université Paris Diderot - Paris 7 (UPD7), Department of Zoology [Cambridge], University of Cambridge [UK] (CAM), Ecophysiologie Végétale, Agronomie et Nutritions (EVA), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut National de la Recherche Agronomique (INRA), Division of Plant Physiology, University of Helsinki, Plante - microbe - environnement : biochimie, biologie cellulaire et écologie (PMEBBCE), Etablissement National d'Enseignement Supérieur Agronomique de Dijon (ENESAD)-Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Molecular Plant Biology, University of Turku, University of Turku, University of Eastern Finland, Department of Forest Sciences [Helsinki], Faculty of Agriculture and Forestry [Helsinki], University of Helsinki-University of Helsinki, Estonian University of Life Sciences, Viikki Plant Science Centre (ViPS), Faculty of Biological and Environmental Sciences [Helsinki], Natural Resources Institute Finland, University of Oulu, Department of Ecology and Genetics [Uppsala] (EBC), Uppsala University, Department of Biological Sciences [Buffalo], University at Buffalo [SUNY] (SUNY Buffalo), State University of New York (SUNY)-State University of New York (SUNY), Institut National de la Recherche Agronomique (INRA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU), Centre National de la Recherche Scientifique (CNRS)-Université de Bourgogne (UB)-Institut National de la Recherche Agronomique (INRA)-Etablissement National d'Enseignement Supérieur Agronomique de Dijon (ENESAD), Estonian University of Life Sciences (EMU), Natural resources institute Finland, Ympäristö- ja biotieteiden laitos / Toiminta, Biosciences, Institute of Biotechnology, Bioinformatics for Molecular Biology and Genomics (BMBG), Plant-Fungal Interactions Group, Plant ROS-Signalling, Department of Forest Sciences, Frederick Asiegbu / Principal Investigator, Forest Ecology and Management, Department of Agricultural Sciences, Plant stress and natural variation, Plant Biology, Ecosystem processes (INAR Forest Sciences), Asteraceae developmental biology and secondary metabolism, Plant Production Sciences, Pekka Heino / Principal Investigator, Tapio Palva Research Group, Genetics, Environmental Sciences, Terrestrial Interactions Research Group, Ari Pekka Mähönen / Principal Investigator, Finnish Museum of Natural History, Botany, Embryophylo, Teemu Teeri / Principal Investigator, Receptor-Ligand Signaling Group, Alan Schulman / Principal Investigator, DNA Sequencing and Genomics, and Yrjö Helariutta / Principal Investigator more...
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0301 basic medicine ,Germplasm ,FLOWERING TIME ,Plant genetics ,Population genetics ,Population ,Genomics ,CAMBIAL ACTIVITY ,Genome ,DNA sequencing ,[SDV.GEN.GPL]Life Sciences [q-bio]/Genetics/Plants genetics ,03 medical and health sciences ,Botany ,Genetics ,[SDV.BV]Life Sciences [q-bio]/Vegetal Biology ,PHYTOCHROME-C ,CYTOKININ ,PLANTS ,TRANSCRIPTION FACTOR ,education ,ComputingMilieux_MISCELLANEOUS ,education.field_of_study ,[SDV.GEN]Life Sciences [q-bio]/Genetics ,BETULA-PUBESCENS ,[SDV.GEN.GPO]Life Sciences [q-bio]/Genetics/Populations and Evolution [q-bio.PE] ,biology ,ta1184 ,ta1183 ,fungi ,1184 Genetics, developmental biology, physiology ,food and beverages ,Betula pubescens ,15. Life on land ,biology.organism_classification ,EVOLUTION ,SIZE ,030104 developmental biology ,Betula pendula ,ARABIDOPSIS-THALIANA - Abstract
Silver birch (Betula pendula) is a pioneer boreal tree that can be induced to flower within 1 year. Its rapid life cycle, small (440-Mb) genome, and advanced germplasm resources make birch an attractive model for forest biotechnology. We assembled and chromosomally anchored the nuclear genome of an inbred B. pendula individual. Gene duplicates from the paleohexaploid event were enriched for transcriptional regulation, whereas tandem duplicates were overrepresented by environmental responses. Population resequencing of 80 individuals showed effective population size crashes at major points of climatic upheaval. Selective sweeps were enriched among polyploid duplicates encoding key developmental and physiological triggering functions, suggesting that local adaptation has tuned the timing of and cross-talk between fundamental plant processes. Variation around the tightly-linked light response genes PHYC and FRS10 correlated with latitude and longitude and temperature, and with precipitation for PHYC. Similar associations characterized the growth-promoting cytokinin response regulator ARR1, and the wood development genes KAK and MED5A., published version, peerReviewed more...
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- 2017
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13. Non-Cell-Autonomous Postmortem Lignification of Tracheary Elements inZinnia elegans
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Bo Zhang, Sacha Escamez, Odile Barbier, Hannele Tuominen, András Gorzsás, Edward Alatalo, Lorenz Gerber, Charleen L. Courtois-Moreau, Lars Paulin, Edouard Pesquet, Jaakko Kangasjärvi, Deborah Goffner, Tuula Puhakainen, Henrik Serk, and Björn Sundberg more...
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0106 biological sciences ,Cinnamyl-alcohol dehydrogenase ,Arabidopsis ,Thiosulfates ,Apoptosis ,Plant Science ,Asteraceae ,Biology ,Benzoates ,Lignin ,01 natural sciences ,Gas Chromatography-Mass Spectrometry ,Cell wall ,03 medical and health sciences ,chemistry.chemical_compound ,Onium Compounds ,Cell Wall ,Gene Expression Regulation, Plant ,Xylem ,Spectroscopy, Fourier Transform Infrared ,Arabidopsis thaliana ,Cells, Cultured ,Research Articles ,030304 developmental biology ,0303 health sciences ,Plant Stems ,Reverse Transcriptase Polymerase Chain Reaction ,fungi ,food and beverages ,Zinnia elegans ,Cell Biology ,Plants, Genetically Modified ,biology.organism_classification ,Aldehyde Oxidoreductases ,Acetylcysteine ,Alcohol Oxidoreductases ,chemistry ,Biochemistry ,Cinnamoyl-CoA reductase ,010606 plant biology & botany - Abstract
Postmortem lignification of xylem tracheary elements (TEs) has been debated for decades. Here, we provide evidence in Zinnia elegans TE cell cultures, using pharmacological inhibitors and in intact Z. elegans plants using Fourier transform infrared microspectroscopy, that TE lignification occurs postmortem (i.e., after TE programmed cell death). In situ RT-PCR verified expression of the lignin monomer biosynthetic cinnamoyl CoA reductase and cinnamyl alcohol dehydrogenase in not only the lignifying TEs but also in the unlignified non-TE cells of Z. elegans TE cell cultures and in living, parenchymatic xylem cells that surround TEs in stems. These cells were also shown to have the capacity to synthesize and transport lignin monomers and reactive oxygen species to the cell walls of dead TEs. Differential gene expression analysis in Z. elegans TE cell cultures and concomitant functional analysis in Arabidopsis thaliana resulted in identification of several genes that were expressed in the non-TE cells and that affected lignin chemistry on the basis of pyrolysis–gas chromatography/mass spectrometry analysis. These data suggest that living, parenchymatic xylem cells contribute to TE lignification in a non-cell-autonomous manner, thus enabling the postmortem lignification of TEs. more...
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- 2013
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14. Short-Day Potentiation of Low Temperature-Induced Gene Expression of a C-Repeat-Binding Factor-Controlled Gene during Cold Acclimation in Silver Birch
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Pekka Heino, Tuula Puhakainen, E. Tapio Palva, Jaakko Kangasjärvi, Maria Boije-Malm, and Chunyang Li
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0106 biological sciences ,Physiology ,Acclimatization ,Photoperiod ,Molecular Sequence Data ,Arabidopsis ,Plant Science ,Genes, Plant ,01 natural sciences ,03 medical and health sciences ,chemistry.chemical_compound ,Gene Expression Regulation, Plant ,Gene expression ,Botany ,Genetics ,Cold acclimation ,Amino Acid Sequence ,Desiccation ,Abscisic acid ,Betula ,Plant Proteins ,030304 developmental biology ,Regulation of gene expression ,photoperiodism ,0303 health sciences ,Sequence Homology, Amino Acid ,biology ,Plant physiology ,Plants, Genetically Modified ,biology.organism_classification ,Cell biology ,Cold Temperature ,Plant Leaves ,chemistry ,Signal Transduction ,Research Article ,010606 plant biology & botany - Abstract
Development of winter hardiness in trees is a two-stage process involving sequential perception of distinct environmental cues, short-day (SD) photoperiod and low temperature (LT). We have shown that both SD and LT are recognized by leaves of silver birch (Betula pendula cv Roth) leading to increased freezing tolerance, and thus leaves can be used as an experimental model to study the physiological and molecular events taking place during cold acclimation. To obtain a molecular marker for the acclimation process in birch we cloned a gene, designated Bplti36, encoding a 36-kD acidic SK2 type of dehydrin. The gene was responsive to LT, drought, salt, and exogenous abscisic acid. This responsiveness to abiotic stresses and abscisic acid was retained when Bplti36 was introduced to Arabidopsis (Arabidopsis thaliana). The LT induction of the gene appeared to be under the control of the C-repeat-binding factor pathway as suggested by the presence of several C-repeat/dehydration-responsive element/LT-responsive elements in the Bplti36 promoter and its constitutive expression in C-repeat-binding factor overproducing Arabidopsis. In birch SD photoperiod at normal-growth temperature did not result in significant induction of Bplti36. However, preexposure to SD followed by LT treatment resulted in a remarkable increase in Bplti36 transcript accumulation as compared to LT-treated plants grown at long-day photoperiod. This suggests that SD photoperiod potentiates the LT response by conditioning the leaf tissue to be more responsive to the LT stimulus. more...
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- 2004
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15. Overexpression of Multiple Dehydrin Genes Enhances Tolerance to Freezing Stress in Arabidopsis
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Pekka Heino, Pirjo Mäkelä, Tuula Puhakainen, Michael W. Hess, Jan T. Svensson, and E. Tapio Palva
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0106 biological sciences ,Arabidopsis ,Plant Science ,Genetically modified crops ,Chimeric gene ,Biology ,01 natural sciences ,03 medical and health sciences ,Gene Expression Regulation, Plant ,Freezing ,Botany ,Genetics ,Cold acclimation ,Microscopy, Immunoelectron ,Gene ,Plant Proteins ,030304 developmental biology ,Regulation of gene expression ,0303 health sciences ,General Medicine ,Plants, Genetically Modified ,biology.organism_classification ,Adaptation, Physiological ,Cell biology ,Plant Leaves ,Cytosol ,Cauliflower mosaic virus ,Agronomy and Crop Science ,010606 plant biology & botany - Abstract
To elucidate the contribution of dehydrins (DHNs) to freezing stress tolerance in Arabidopsis, transgenic plants overexpressing multiple DHN genes were generated. Chimeric double constructs for expression of RAB18 and COR47 (pTP9) or LTI29 and LTI30 (pTP10) were made by fusing the coding sequences of the respective DHN genes to the cauliflower mosaic virus 35S promoter. Overexpression of the chimeric genes in Arabidopsis resulted in accumulation of the corresponding dehydrins to levels similar or higher than in cold-acclimated wild-type plants. Transgenic plants exhibited lower LT50 values and improved survival when exposed to freezing stress compared to the control plants. Post-embedding immuno electron microscopy of high-pressure frozen, freeze-substituted samples revealed partial intracellular translocation from cytosol to the vicinity of the membranes of the acidic dehydrin LTI29 during cold acclimation in transgenic plants. This study provides evidence that dehydrins contribute to freezing stress tolerance in plants and suggests that this could be partly due to their protective effect on membranes. more...
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- 2004
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16. Ecotype-dependent control of growth, dormancy and freezing tolerance under seasonal changes in Betula pendula Roth
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E. Tapio Palva, Pekka Heino, Olavi Junttila, Anneli Viherä-Aarnio, Tuula Puhakainen, and Chunyang Li
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photoperiodism ,Ecology ,Ecotype ,Physiology ,Growing season ,Plant physiology ,Forestry ,Plant Science ,Biology ,chemistry.chemical_compound ,chemistry ,Botany ,Cold acclimation ,Dormancy ,Hardiness (plants) ,Abscisic acid - Abstract
Woody plants in the temperate and boreal zone undergo annual cycle of growth and dormancy under seasonal changes. Growth cessation and dormancy induction in autumn are prerequisites for the development of substantial cold hardiness in winter. During evolution, woody plants have developed different ecotypes that are closely adapted to the local climatic conditions. In this study, we employed distinct photoperiodic ecotypes of silver birch (Betula pendula Roth) to elucidate differences in these adaptive responses under seasonal changes. In all ecotypes, short day photoperiod (SD) initiated growth cessation and dormancy development, and induced cold acclimation. Subsequent low temperature (LT) exposure significantly enhanced freezing tolerance but removed bud dormancy. Our results suggested that dormancy and freezing tolerance might partially overlap under SD, but these two processes were regulated by different mechanisms and pathways under LT. Endogenous abscisic acid (ABA) levels were also altered under seasonal changes; the ABA level was low during the growing season, then increased in autumn, and decreased in winter. Compared with the southern ecotype, the northern ecotype was more responsive to seasonal changes, resulting in earlier growth cessation, cold acclimation and dormancy development in autumn, higher freezing tolerance and faster dormancy release in winter, and earlier bud flush and growth initiation in spring. In addition, although there was no significant ecotypic difference in ABA level during growing season, the rates and degrees of ABA alterations were different between the ecotypes in autumn and winter, and could be related to ecotypic differences in dormancy and freezing tolerance. more...
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- 2003
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17. Cold acclimation in silver birch (Betula pendula). Development of freezing tolerance in different tissues and climatic ecotypes
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Anneli Viherä-Aarnio, Chunyang Li, Tuula Puhakainen, Annikki Welling, Pekka Heino, E. Tapio Palva, Olavi Junttila, and Arild Ernstsen
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0106 biological sciences ,photoperiodism ,0303 health sciences ,Ecotype ,Physiology ,Cell Biology ,Plant Science ,General Medicine ,15. Life on land ,Biology ,01 natural sciences ,Subarctic climate ,03 medical and health sciences ,chemistry.chemical_compound ,chemistry ,Boreal ,13. Climate action ,Betula pendula ,Botany ,Genetics ,Cold acclimation ,Abscisic acid ,Freezing tolerance ,030304 developmental biology ,010606 plant biology & botany - Abstract
A number of environmental cues including short day photoperiod (SD) and low temperature (LT) are known to interact in triggering growth cessation, cold acclimation and other adaptive responses in temperate-zone tree species. Proper timing of these responses is particularly important for survival of trees in the boreal and subarctic regions. Therefore, we used a northern tree species, silver birch (Betula pendula Roth) as an experimental model to investigate the effect of SD and LT on development of freezing tolerance and on levels of endogenous abscisic acid (ABA) in short-term experiments under controlled conditions. We characterized differences in SD and LT-induced cold acclimation between three different climatic ecotypes from southern, central and northern habitats. The results demonstrated that cold acclimation was rapidly triggered by exposing the plants to SD or LT, and that a combination of the different treatments had an additive effect on freezing tolerance. Freezing tolerance induction was not uniform in the different tissues, the buds and leaves developed freezing tolerance more rapidly than the stem, and the young leaves had a higher freezing tolerance than the old leaves. The ability of the leaves to respond to SD and LT and similarity of the bud and leaf responses indicate that birch leaves provide a rapid and convenient system for studies on molecular mechanisms of cold acclimation. Development of freezing tolerance was dependent on the climatic ecotype, the northern ecotype was clearly more responsive to both SD and LT than the two more southern ecotypes. Development of freezing tolerance induced by SD and LT was accompanied by transient changes in ABA levels. These alterations in ABA levels were ecotype-dependent, the northern ecotype reacting more strongly to the environmental cues. more...
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- 2002
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18. Cold acclimation enhances the activity of plasma membrane Ca2+ ATPase in winter rye leaves
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Marianne Sommarin, Susanne Widell, Kaarina Pihakaski-Maunsbach, and Tuula Puhakainen
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Secale ,biology ,Calmodulin ,Physiology ,Chemistry ,ATPase ,chemistry.chemical_element ,Plant Science ,Calcium ,biology.organism_classification ,Membrane ,Biochemistry ,ATP hydrolysis ,Genetics ,Cold acclimation ,biology.protein ,Plasma membrane Ca2+ ATPase - Abstract
Exposure of plant cells and tissues to low or freezing temperatures often lead to uncontrolled and detrimental ion leakage. Therefore, when plants acclimate to low temperatures, processes that control ionic homeostasis are important. Here we characterized H + ATPase and ATP-dependent Ca 2+ transport activities in isolated plasma membranes of cold-acclimated and non-acclimated winter rye leaves ( Secale cereale L. cv. Voima). Cold acclimation resulted in a two-fold higher Ca 2+ transport activity, significantly different ( P = 0.021) from that of non-acclimated rye, whereas only a small increase in H + ATPase activity, measured as ATP hydrolysis, was observed in cold-acclimated compared to non-acclimated preparations. In plasma membranes, extensively washed with EDTA and Brij 58 to remove endogenous calmodulin, Ca 2+ transport activity increased to about double by calmodulin addition, with both non-acclimated and cold-acclimated material. Uptake of Ca 2+ was seen within the pHrange analyzed (pH 6–8), with an optimum at pH 7.2 with both materials, and both in the absence and in the presence of calmodulin. The increase in activity of ATP-dependent Ca 2+ transport in cold-acclimated rye plasma membranes probably reflects the capacity needed to sustain the resting level of cytosolic Ca 2+ concentration that is characteristic to the cold-acclimated situation. more...
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- 1999
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19. Effect of cold exposure on cortical microtubules of rye (Secale cereale) as observed by immunocytochemistry
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Tuula Puhakainen and Kaarina Pihakaski-Maunsbach
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Secale ,Physiology ,fungi ,Immunocytochemistry ,food and beverages ,Cell Biology ,Plant Science ,General Medicine ,Biology ,Protoplast ,biology.organism_classification ,Microtubule ,Botany ,Osmoregulation ,Biophysics ,Cold acclimation ,Genetics ,Tonicity ,Cortical microtubule - Abstract
The responses of cortical microtubules to sub-zero temperatures were examined in non-acclimated (NA) and cold-acclimated (CA) rye (Secale cereale L. cv. Voima) leaf and root cells, and in protoplasts isolated enzymatically from leaves. Responses of leaf and root cells to hypertonic solutions equivalent to the dehydration response of freezing (P. L. Steponkus and D. V. Lynch 1989. J. Bioenerg. Biomembr. 21: 21–41) were also examined. At the respective growth temperatures both NA and CA leaf and root cells had typical organization and abundance of cortical microtubules as observed by indirect immunofluorescence (IIF) staining. Unchanged microtubule arrays were still present in CA leaf cells after -4°C treatment, while in leaf cells of NA plants and in the root cells of both NA and CA plants microtubules were shorter and less abundant. After -10°C treatment the cortical microtubules were almost totally depolymerized in both types of root cells and in leaf cells of NA plants, while CA leaf cells still had abundant cortical microtubule arrays. Semiquantitative analyses of cortical microtubules (MTs) of protoplasts confirmed the findings with intact leaf cells. Hypertonic treatment of NA and CA leaf cells gave similar effects as exposure of cells to sub-zero temperatures. However, after the hypertonic treatment, more microtubules remained present in the CA root cells than in the NA root cells, suggesting that also in root cells cold acclimation increases the dehydration stability of MTs. In conclusion, cold acclimation induces both greater frost stability and greater osmotic tolerance in the cortical microtubules of the leaf cells, and greater osmotic tolerance in the microtubules of the root cells in winter rye. more...
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- 1995
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20. Differential responses of silver birch (Betula pendula) ecotypes to short-day photoperiod and low temperature
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Annikki Welling, Tuula Puhakainen, Chunyang Li, Anneli Viherä-Aarnio, E. Tapio Palva, Pekka Heino, Arild Ernstsen, and Olavi Junttila
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Time Factors ,Physiology ,Photoperiod ,Plant Science ,Biology ,chemistry.chemical_compound ,Botany ,Freezing ,Cold acclimation ,Abscisic acid ,Freezing tolerance ,Betula ,Ecosystem ,photoperiodism ,Ecotype ,fungi ,food and beverages ,Environment, Controlled ,Adaptation, Physiological ,Cold Temperature ,Horticulture ,chemistry ,Betula pendula ,Dormancy ,Bud dormancy ,Abscisic Acid - Abstract
We investigated interrelations of dormancy and freezing tolerance and the role of endogenous abscisic acid (ABA) in the development of silver birch (Betula pendula Roth) ecotypes in controlled environments. Short-day treatment induced growth cessation, bud set and dormancy development, as well as initiation of cold acclimation and an increase in freezing tolerance. Subsequent low temperature and short days (12-h photoperiod) resulted in a significant increase in freezing tolerance, whereas bud dormancy was gradually released. The concentration of ABA increased in response to short days and then remained high, but ABA concentrations fluctuated irregularly when the dormant plants were subsequently exposed to low temperature during short days. Although there was a parallel development of freezing tolerance and bud dormancy in response to short days, subsequent exposure to low temperature had opposite effects on these processes, enhancing freezing tolerance and releasing dormancy. Compared with the southern ecotype, the northern ecotype was more responsive to short days and low temperature, exhibiting earlier initiation of cold acclimation, growth cessation and an increase in ABA concentrations in short days, and higher freezing tolerance, faster dormancy release and greater alteration in ABA concentrations when subsequently exposed to low temperature during short days. The rates and extent of the increases in ABA concentration may be related to increases in freezing tolerance and dormancy development during short days, whereas the extent of the fluctuations in ABA concentration may play an important role in enhancing freezing tolerance and releasing dormancy during a subsequent exposure to low temperature during short days. more...
- Published
- 2005
21. Engineering Trehalose Biosynthesis Improves Stress Tolerance in Arabidopsis
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Kjell-Ove Holmström, Tuula Puhakainen, Pekka Heino, Pirjo Mäkelä, E. Tapio Palva, Joachim Müller, and Ilkka Tamminen
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0106 biological sciences ,2. Zero hunger ,0303 health sciences ,biology ,Abiotic stress ,business.industry ,Drought tolerance ,15. Life on land ,biology.organism_classification ,01 natural sciences ,Biotechnology ,Stress (mechanics) ,03 medical and health sciences ,Arabidopsis ,Cold acclimation ,Plant breeding ,Agricultural productivity ,business ,Productivity ,030304 developmental biology ,010606 plant biology & botany - Abstract
Environmental stresses caused by drought and extremes of temperature are main factors limiting plant growth, productivity and distribution and up to 80 % of the total crop losses are caused by such climatic factors (Boyer, 1982). Consequently, increase in plant stress tolerance could have a major impact on agricultural productivity. Genetic engineering has recently been shown to provide new approaches for plant breeding and considerable efforts has been made to design strategies for genetic engineering of stress tolerance (Thomashow, 1999; Nuotio et al., 2001). Unfortunately, developmental, structural and physiological adaptations to stresses are often based on complex mechanisms involving a number of different genes (McCue and Hanson, 1990) and therefore not amenable to genetic engineering. However, some of the responses to abiotic stress appear to be based on relatively simple metabolic traits governed by a limited number of genes. more...
- Published
- 2002
- Full Text
- View/download PDF
22. Endocytosis in cold acclimated and non-acclimated protoplasts
- Author
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Kaarina Pihakaski-Maunsbach and Tuula Puhakainen
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Chemistry ,Anatomy ,Protoplast ,Endocytosis ,Cell biology - Published
- 1992
- Full Text
- View/download PDF
23. Tutkimus raivaa tietä palkokasvien viljelylle
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Fred Stoddard, Anna Kristina Lindström, Asko Simojoki, Tuula Puhakainen, and Arja Nykänen
24. Adaptation of boreal field crop production to climate change
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Pirjo Mäkelä, Frederick L. Stoddard, Tuula Puhakainen, Blanco, J., Kheradmand, H., Department of Agricultural Sciences, Legume science, Plant Production Sciences, and Crop Science Research Group
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0106 biological sciences ,education ,Permafrost ,Atmospheric sciences ,01 natural sciences ,4111 Agronomy ,heat stress ,03 medical and health sciences ,genetic modification ,Precipitation ,030304 developmental biology ,2. Zero hunger ,0303 health sciences ,Global temperature ,epigenetics ,Global warming ,drought stress ,414 Agricultural biotechnology ,15. Life on land ,Snow ,waterlogging ,Agronomy ,Boreal ,13. Climate action ,frost stress ,Soil water ,Environmental science ,daylength ,crop breeding ,management ,010606 plant biology & botany ,Waterlogging (agriculture) - Abstract
The average annual global temperature increased by 0.76°C during the past century (Intergovernmental Panel on Climate Change (IPCC), 2007) and climate modelling results show an increase in annual temperature in boreal regions of 0.1 – 0.4°C/decade over the 21st century, depending on the scenario and model. Warming will be unevenly distributed, being greater in summer in lower and middle latitudes but greater in winter at higher latitudes, and this differential will increase. Mean annual precipitation is projected to increase in the North and decrease in the South, and winter precipitation will increase in northern and central Europe, continuing the trends established in the 20th century of a 10 – 40% increase in northern Europe and a decrease of up to 20% in southern Europe (IPCC, 2007). The increase in winter precipitation is due to the increased water carrying capacity of the atmosphere resulting from the higher temperature. Global warming will increase the frequency of soil freeze-thaw cycles (FTCs) in cooltemperate and high-latitude regions previously subject to prolonged winter soil frost (Kreyling et al., 2007; Henry, 2008). Warmer winters will result in fewer soil freezing days and in boreal Europe, lowland permafrost is expected to eventually disappear (Harris et al., 2009). The length of the frost-free season has already increased in most midand highlatitude regions of both hemispheres over the values established in the middle of the 20th century. In the Northern Hemisphere, this is mostly manifested as an earlier start to spring, which will arrive progressively earlier in Europe by 2.5 d per decade (Menzel et al., 2006). Increased precipitation in winter, when there is little plant growth, increases the probability of leaching, runoff and erosion from unprotected boreal soils. Climatic warming can paradoxically lead to colder soil temperatures in winter when it reduces the thickness of the insulating snow cover (Henry, 2008 and references therein) leading to root injury (Kreyling, 2010). Increased soil freezing when snow was removed led to root injury, increased leaching of C, N and P, and decreased soil microarthropod abundance (Groffman et al., 2001; Weih & Karlsson, 2002; Henry, 2008), but it is unclear what impacts FTCs and lower soil temperature will have on soil biological and physical processes. Observed nitrate losses to the groundwater after deep soil frost events are attributable more to reduced root uptake due to root injury than to increased N net mineralization (Matzner & Borken, 2008) (Figure 1). The intensity and frequency of summer heat waves is likely to increase (IPCC, 2007). Between 1977 and 2000, these trends were more extreme in central and north-eastern Europe and in mountainous regions than in the Mediterranean region. Temperatures are increasing more...
25. Cold acclimation and development of freezing and drought tolerance in plants
- Author
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O. Aalto, Pekka Heino, Pirjo Mäkelä, M. Boije, S. Taehtiharju, Annikki Welling, E. T. Palva, Tuula Puhakainen, K. Aspegren, Chunyang Li, Elina Helenius, Roosa A. E. Laitinen, and Ilkka Tamminen
- Subjects
Agronomy ,Drought tolerance ,Cold acclimation ,Horticulture ,Biology
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