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181 results on '"Hodkinson, Trevor R."'

1. Phylogenomics and the rise of the angiosperms

Author

Zuntini, Alexandre R., Carruthers, Tom, Maurin, Olivier, Bailey, Paul C., Leempoel, Kevin, Brewer, Grace E., Epitawalage, Niroshini, Françoso, Elaine, Gallego-Paramo, Berta, McGinnie, Catherine, Negrão, Raquel, Roy, Shyamali R., Simpson, Lalita, Toledo Romero, Eduardo, Barber, Vanessa M. A., Botigué, Laura, Clarkson, James J., Cowan, Robyn S., Dodsworth, Steven, Johnson, Matthew G., Kim, Jan T., Pokorny, Lisa, Wickett, Norman J., Antar, Guilherme M., DeBolt, Lucinda, Gutierrez, Karime, Hendriks, Kasper P., Hoewener, Alina, Hu, Ai-Qun, Joyce, Elizabeth M., Kikuchi, Izai A. B. S., Larridon, Isabel, Larson, Drew A., de Lírio, Elton John, Liu, Jing-Xia, Malakasi, Panagiota, Przelomska, Natalia A. S., Shah, Toral, Viruel, Juan, Allnutt, Theodore R., Ameka, Gabriel K., Andrew, Rose L., Appelhans, Marc S., Arista, Montserrat, Ariza, María Jesús, Arroyo, Juan, Arthan, Watchara, Bachelier, Julien B., Bailey, C. Donovan, Barnes, Helen F., Barrett, Matthew D., Barrett, Russell L., Bayer, Randall J., Bayly, Michael J., Biffin, Ed, Biggs, Nicky, Birch, Joanne L., Bogarín, Diego, Borosova, Renata, Bowles, Alexander M. C., Boyce, Peter C., Bramley, Gemma L. C., Briggs, Marie, Broadhurst, Linda, Brown, Gillian K., Bruhl, Jeremy J., Bruneau, Anne, Buerki, Sven, Burns, Edie, Byrne, Margaret, Cable, Stuart, Calladine, Ainsley, Callmander, Martin W., Cano, Ángela, Cantrill, David J., Cardinal-McTeague, Warren M., Carlsen, Mónica M., Carruthers, Abigail J. A., de Castro Mateo, Alejandra, Chase, Mark W., Chatrou, Lars W., Cheek, Martin, Chen, Shilin, Christenhusz, Maarten J. M., Christin, Pascal-Antoine, Clements, Mark A., Coffey, Skye C., Conran, John G., Cornejo, Xavier, Couvreur, Thomas L. P., Cowie, Ian D., Csiba, Laszlo, Darbyshire, Iain, Davidse, Gerrit, Davies, Nina M. J., Davis, Aaron P., van Dijk, Kor-jent, Downie, Stephen R., Duretto, Marco F., Duvall, Melvin R., Edwards, Sara L., Eggli, Urs, Erkens, Roy H. J., Escudero, Marcial, de la Estrella, Manuel, Fabriani, Federico, Fay, Michael F., Ferreira, Paola de L., Ficinski, Sarah Z., Fowler, Rachael M., Frisby, Sue, Fu, Lin, Fulcher, Tim, Galbany-Casals, Mercè, Gardner, Elliot M., German, Dmitry A., Giaretta, Augusto, Gibernau, Marc, Gillespie, Lynn J., González, Cynthia C., Goyder, David J., Graham, Sean W., Grall, Aurélie, Green, Laura, Gunn, Bee F., Gutiérrez, Diego G., Hackel, Jan, Haevermans, Thomas, Haigh, Anna, Hall, Jocelyn C., Hall, Tony, Harrison, Melissa J., Hatt, Sebastian A., Hidalgo, Oriane, Hodkinson, Trevor R., Holmes, Gareth D., Hopkins, Helen C. F., Jackson, Christopher J., James, Shelley A., Jobson, Richard W., Kadereit, Gudrun, Kahandawala, Imalka M., Kainulainen, Kent, Kato, Masahiro, Kellogg, Elizabeth A., King, Graham J., Klejevskaja, Beata, Klitgaard, Bente B., Klopper, Ronell R., Knapp, Sandra, Koch, Marcus A., Leebens-Mack, James H., Lens, Frederic, Leon, Christine J., Léveillé-Bourret, Étienne, Lewis, Gwilym P., Li, De-Zhu, Li, Lan, Liede-Schumann, Sigrid, Livshultz, Tatyana, Lorence, David, Lu, Meng, Lu-Irving, Patricia, Luber, Jaquelini, Lucas, Eve J., Luján, Manuel, Lum, Mabel, Macfarlane, Terry D., Magdalena, Carlos, Mansano, Vidal F., Masters, Lizo E., Mayo, Simon J., McColl, Kristina, McDonnell, Angela J., McDougall, Andrew E., McLay, Todd G. B., McPherson, Hannah, Meneses, Rosa I., Merckx, Vincent S. F. T., Michelangeli, Fabián A., Mitchell, John D., Monro, Alexandre K., Moore, Michael J., Mueller, Taryn L., Mummenhoff, Klaus, Munzinger, Jérôme, Muriel, Priscilla, Murphy, Daniel J., Nargar, Katharina, Nauheimer, Lars, Nge, Francis J., Nyffeler, Reto, Orejuela, Andrés, Ortiz, Edgardo M., Palazzesi, Luis, Peixoto, Ariane Luna, Pell, Susan K., Pellicer, Jaume, Penneys, Darin S., Perez-Escobar, Oscar A., Persson, Claes, Pignal, Marc, Pillon, Yohan, Pirani, José R., Plunkett, Gregory M., Powell, Robyn F., Prance, Ghillean T., Puglisi, Carmen, Qin, Ming, Rabeler, Richard K., Rees, Paul E. J., Renner, Matthew, Roalson, Eric H., Rodda, Michele, Rogers, Zachary S., Rokni, Saba, Rutishauser, Rolf, de Salas, Miguel F., Schaefer, Hanno, Schley, Rowan J., Schmidt-Lebuhn, Alexander, Shapcott, Alison, Al-Shehbaz, Ihsan, Shepherd, Kelly A., Simmons, Mark P., Simões, André O., Simões, Ana Rita G., Siros, Michelle, Smidt, Eric C., Smith, James F., Snow, Neil, Soltis, Douglas E., Soltis, Pamela S., Soreng, Robert J., Sothers, Cynthia A., Starr, Julian R., Stevens, Peter F., Straub, Shannon C. K., Struwe, Lena, Taylor, Jennifer M., Telford, Ian R. H., Thornhill, Andrew H., Tooth, Ifeanna, Trias-Blasi, Anna, Udovicic, Frank, Utteridge, Timothy M. A., Del Valle, Jose C., Verboom, G. Anthony, Vonow, Helen P., Vorontsova, Maria S., de Vos, Jurriaan M., Al-Wattar, Noor, Waycott, Michelle, Welker, Cassiano A. D., White, Adam J., Wieringa, Jan J., Williamson, Luis T., Wilson, Trevor C., Wong, Sin Yeng, Woods, Lisa A., Woods, Roseina, Worboys, Stuart, Xanthos, Martin, Yang, Ya, Zhang, Yu-Xiao, Zhou, Meng-Yuan, Zmarzty, Sue, Zuloaga, Fernando O., Antonelli, Alexandre, Bellot, Sidonie, Crayn, Darren M., Grace, Olwen M., Kersey, Paul J., Leitch, Ilia J., Sauquet, Hervé, Smith, Stephen A., Eiserhardt, Wolf L., Forest, Félix, and Baker, William J.

Published
2024
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2. Global gene flow releases invasive plants from environmental constraints on genetic diversity

Author

Smith, Annabel L, Hodkinson, Trevor R, Villellas, Jesus, Catford, Jane A, Csergő, Anna Mária, Blomberg, Simone P, Crone, Elizabeth E, Ehrlén, Johan, Garcia, Maria B, Laine, Anna-Liisa, Roach, Deborah A, Salguero-Gómez, Roberto, Wardle, Glenda M, Childs, Dylan Z, Elderd, Bret D, Finn, Alain, Munné-Bosch, Sergi, Baudraz, Maude EA, Bódis, Judit, Brearley, Francis Q, Bucharova, Anna, Caruso, Christina M, Duncan, Richard P, Dwyer, John M, Gooden, Ben, Groenteman, Ronny, Hamre, Liv Norunn, Helm, Aveliina, Kelly, Ruth, Laanisto, Lauri, Lonati, Michele, Moore, Joslin L, Morales, Melanie, Olsen, Siri Lie, Pärtel, Meelis, Petry, William K, Ramula, Satu, Rasmussen, Pil U, Enri, Simone Ravetto, Roeder, Anna, Roscher, Christiane, Saastamoinen, Marjo, Tack, Ayco JM, Töpper, Joachim Paul, Vose, Gregory E, Wandrag, Elizabeth M, Wingler, Astrid, and Buckley, Yvonne M

Subjects
Genetics, Demography, Gene Flow, Genetic Variation, Introduced Species, Phylogeny, Plantago, plant invasion, adaptation, global change, population genetics, demography
Abstract

When plants establish outside their native range, their ability to adapt to the new environment is influenced by both demography and dispersal. However, the relative importance of these two factors is poorly understood. To quantify the influence of demography and dispersal on patterns of genetic diversity underlying adaptation, we used data from a globally distributed demographic research network comprising 35 native and 18 nonnative populations of Plantago lanceolata Species-specific simulation experiments showed that dispersal would dilute demographic influences on genetic diversity at local scales. Populations in the native European range had strong spatial genetic structure associated with geographic distance and precipitation seasonality. In contrast, nonnative populations had weaker spatial genetic structure that was not associated with environmental gradients but with higher within-population genetic diversity. Our findings show that dispersal caused by repeated, long-distance, human-mediated introductions has allowed invasive plant populations to overcome environmental constraints on genetic diversity, even without strong demographic changes. The impact of invasive plants may, therefore, increase with repeated introductions, highlighting the need to constrain future introductions of species even if they already exist in an area.

Published
2020

36. Marriage exchanges, seed exchanges, and the dynamics of manioc diversity

Author

Hodkinson, Trevor R., Deletrea, Marc, McKey, Doyle B., and Hodkinson, Trevor R

Subjects
Crops, Agricultural, social reproduction, Genetic diversity, Multidisciplinary, Ecology, business.industry, media_common.quotation_subject, Agricultural biotechnology, Biodiversity, Metapopulation, Biological Sciences, Geography, Crop diversity, Agriculture, Kinship, Gabon, seed transmission, business, Diversity (politics), media_common
Abstract

The conservation of crop genetic resources requires understanding the different variables-cultural, social, and economic-that impinge on crop diversity. In small-scale farming systems, seed exchanges represent a key mechanism in the dynamics of crop genetic diversity, and analyzing the rules that structure social networks of seed exchange between farmer communities can help decipher patterns of crop genetic diversity. Using a combination of ethnobotanical and molecular genetic approaches, we investigated the relationships between regional patterns of manioc genetic diversity in Gabon and local networks of seed exchange. Spatially explicit Bayesian clustering methods showed that geographical discontinuities of manioc genetic diversity mirror major ethnolinguistic boundaries, with a southern matrilineal domain characterized by high levels of varietal diversity and a northern patrilineal domain characterized by low varietal diversity. Borrowing concepts from anthropology-kinship, bridewealth, and filiation-we analyzed the relationships between marriage exchanges and seed exchange networks in patrilineal and matrilineal societies. We demonstrate that, by defining marriage prohibitions, kinship systems structure social networks of exchange between farmer communities and influence the movement of seeds in metapopulations, shaping crop diversity at local and regional levels. The conservation of crop genetic resources requires understanding the different variables-cultural, social, and economic-that impinge on crop diversity. In small-scale farming systems, seed exchanges represent a key mechanism in the dynamics of crop genetic diversity, and analyzing the rules that structure social networks of seed exchange between farmer communities can help decipher patterns of crop genetic diversity. Using a combination of ethnobotanical and molecular genetic approaches, we investigated the relationships between regional patterns of manioc genetic diversity in Gabon and local networks of seed exchange. Spatially explicit Bayesian clustering methods showed that geographical discontinuities of manioc genetic diversity mirror major ethnolinguistic boundaries, with a southern matrilineal domain characterized by high levels of varietal diversity and a northern patrilineal domain characterized by low varietal diversity. Borrowing concepts from anthropology-kinship, bridewealth, and filiation-we analyzed the relationships between marriage exchanges and seed exchange networks in patrilineal and matrilineal societies. We demonstrate that, by defining marriage prohibitions, kinship systems structure social networks of exchange between farmer communities and influence the movement of seeds in metapopulations, shaping crop diversity at local and regional levels. Teagasc IRCSET

Published
2011

37. Phylogenetics of Taxus Using the Internal Transcribed Spacers of Nuclear Ribosomal DNA and Plastid trnL-F Regions.

Author

Coughlan, Patricia, Carolan, James C., Hook, Ingrid L. I., Kilmartin, Lisa, and Hodkinson, Trevor R.

Subjects
PLANT phylogeny, RIBOSOMAL DNA, PLASTIDS, TAXUS, PACLITAXEL
Abstract

Taxus is a genus of trees and shrubs with high value in horticulture and medicine as a source of the anticancer drug paclitaxel. The taxonomy of the group is complex due to the lack of diagnostic morphological characters and the high degree of similarity among species. Taxus has a wide global geographic distribution and some taxonomists recognize only a single species with geographically defined subgroups, whereas others have described several species. To address these differences in taxonomic circumscription, phylogenetic analyses were conducted on DNA sequences using Maximum Likelihood, Bayesian Inference and TCS haplotype networks on single and combined gene regions obtained for the nuclear ribosomal ITS region and the plastid trnL intron and trnL-F intergenic spacer. Evidence is presented for the sister group status of Pseudotaxus to Taxus and the inclusion of Amentotaxus, Austrotaxus, Cephalotaxus and Torreya within Taxaceae. Results are consistent with the taxonomic recognition of nine species: T. baccata, T. brevifolia, T. canadensis, T. cuspidata, T. floridana, T. fuana, T. globosa, T. sumatrana and T. wallichiana, but evidence is found for less species distinction and considerable reticulation within the T. baccata, T. canadensis and T. cuspidata group. We compare the results to known taxonomy, biogeography, present new leaf anatomical data and discuss the origins of the hybrids T. Xmedia and T. Xhunnewelliana. [ABSTRACT FROM AUTHOR]

Published
2020
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40. Dimeria Brown 1810

Author

Teerawatananon, Atchara, Boontia, Veeraya, Chantarasuwan, Bhanumas, Hodkinson, Trevor R., and Sungkaew, Sarawood

Subjects
Tracheophyta, Dimeria, Poales, Liliopsida, Biodiversity, Plantae, Poaceae, Taxonomy
Abstract

Key to Thai species of Dimeria 1. Racemes solitary................................................................................................................................................................................2. - Racemes more than one.....................................................................................................................................................................4. 2. Spikelets 4.5–5 mm long. Rhachis 0.8–1.2 mm wide....................................................................................... D. kurumthotticalana - Spikelets 3–4 mm long. Rhachis 0.4–0.7 mm wide..........................................................................................................................3. 3. Upper glumes wingless........................................................................................................................................................... D. kurzii - Upper glumes winged......................................................................................................................................................... D. sinensis 4. Racemes with filiform rhachis............................................................................................................................................ D. velutina - Racemes with flattened or triangular rhachis....................................................................................................................................5. 5. Spikelets 1–3(–4.5) mm long; upper glumes wingless. Rhachis 0.2–0.4 mm wide.................................................... D. ornithopoda - Spikelets 4–6 mm long; upper glumes winged. Rhachis 0.6–1.2 mm wide......................................................................................6. 6. Upper glumes broadly winged. Wings rugose........................................................................................................................ D. kerrii - Upper glumes narrowly winged. Wings not rugose..........................................................................................................................7. 7. Rhachis 0.7–0.8 mm wide, rhachis internodes 1.5–2(–2.5) mm long. Upper glumes acute, narrowly winged all along the keel.............................................................................................................................................................................................. D. fuscescens - Rhachis 0.8 − 1.2 mm wide, rhachis internodes 0.8–1.5 mm long. Upper glumes acuminate to long acuminate and slightly recurved, narrowly winged in the upper one third of glume to the apex........................................................................... D. kurumthotticalana, Published as part of Teerawatananon, Atchara, Boontia, Veeraya, Chantarasuwan, Bhanumas, Hodkinson, Trevor R. & Sungkaew, Sarawood, 2014, A taxonomic revision of the genus Dimeria (Poaceae: Panicoideae) in Thailand, pp. 137-147 in Phytotaxa 186 (3) on page 138, DOI: 10.11646/phytotaxa.186.3.2, http://zenodo.org/record/5147015

Published
2014
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41. Nuclear SSR markers for Miscanthus, Saccharum, and related grasses (Saccharinae, Poaceae)1

Author

Hodkinson, Trevor R., de Cesare, Mariateresa, and Barth, Susanne

Subjects
SSRs, food and beverages, Miscanthus, Primer Note, cross-species amplification, Poaceae, microsatellites, Saccharum
Abstract

• Premise of the study: We developed nuclear simple sequence repeat (SSR) markers for the characterization of the biomass crop Miscanthus, especially M. sacchariflorus, M. sinensis, and M. ×giganteus, and tested for cross-species amplification. • Methods and Results: Twenty-nine SSR markers (di- and tetranucleotide repeats) were developed from DNA sequences obtained from 192 clones from an enriched genomic library of M. sinensis. All markers were successfully amplified in M. sacchariflorus, M. sinensis, and M. ×giganteus, and 19 amplified across a broad range of Miscanthus species. Polymorphism information content and expected heterozygosity values (19 locus sample) were 0.88 and 0.89, respectively, for M. sinensis, 0.48 and 0.54 for M. sacchariflorus, and were the lowest in M. ×giganteus (0.33, 0.41). Thirteen out of 19 primer pairs showed cross-species amplification in non-Miscanthus sensu stricto taxa. • Conclusions: The new set of 29 SSR markers will be of high value for characterizing Miscanthus germplasm collections, for prebreeding, and for assessing variation in natural populations.

Published
2013

46. Hybrids and the flora of Thailand

Author

Parnell, John A. N., Pedersen, Henrik Ærenlund, Hodkinson, Trevor R., Balslev, Henrik, van Welzen, Peter C., Simpson, David, Middleton, David J., Esser, Hans-Joachim, Pooma, Rachun, Utteridge, Timothy, and Staples, George

Published
2013

49. Environmental risk assessment of genetically modified crops: The use of molecular markers to trace insect and wind dispersal of Brassica napus pollen

Author

Flannery, M.L., Mitchell, F.J.H., Hodkinson, Trevor R, Kavanagh, T., Dowding, P., Coyne, S., and Burke, James I.

Subjects
Genetically modified crops, fungi, Pollen dispersal, Brassica napus, isolation distances, food and beverages, environmental risk assessment, Molecular markers, Gene flow, Oilseed rape
Abstract

End of Project Report This project aimed to develop a better understanding of the potential risks of gene flow and to generate isolation distances required for genetically modified (GM) OSR. The study examined biotic (insect) and abiotic (wind) pollen dispersal over two seasons. A considerable portion of work was devoted to the development of molecular markers, to differentiate Brassica napus varieties from each other to distinguish them from their wild relatives. The project broadly aimed to study gene flow, via pollen movement, from OSR but specifically aimed to: ! Characterise B. napus cv. Marinka using molecular markers. ! Elucidate the distance travelled by OSR pollen by biotic dispersal. ! Elucidate the distance travelled by OSR pollen by abiotic dispersal. ! Elucidate pollination/seed set at various distances from a source crop using male sterile bait plants. ! Develop risk assessment/containment strategies.

Published
2004

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