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13 results on '"Tisi, Alessandra"'

9. Synthesis and Biological Evaluation of Guanidino Compounds Endowed with Subnanomolar Affinity as Competitive Inhibitors of Maize Polyamine Oxidase

Author

Manetti, Fabrizio, primary, Cona, Alessandra, additional, Angeli, Lucilla, additional, Mugnaini, Claudia, additional, Raffi, Francesco, additional, Capone, Caterina, additional, Dreassi, Elena, additional, Zizzari, Alessandra Tania, additional, Tisi, Alessandra, additional, Federico, Rodolfo, additional, and Botta, Maurizio, additional

Published
2009
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13. The MeJA-inducible copper amine oxidase AtAO1 is expressed in xylem tissue and guard cells

Author

Renato A. Rodrigues-Pousada, Riccardo Angelini, Andrea Carucci, Alessandra Cona, Sandip A. Ghuge, Paraskevi Tavladoraki, Alessandra Tisi, Stefano Franchi, Ghuge, SANDIP ANNASAHEB, Carucci, Andrea, Rodrigues Pousada, Renato A, Tisi, Alessandra, Franchi, Stefano, Tavladoraki, Paraskevi, Angelini, Riccardo, and Cona, Alessandra

Subjects
Polyamine, Amine oxidases, Arabidopsis, Polyamines, Hydrogen Peroxide, Xylem differentiation, Cell wall, Stomata, Methyl Jasmonate, Plant Science, Cyclopentanes, Flowers, Acetates, Amine oxidase, Plant Roots, chemistry.chemical_compound, Xylem, Putrescine, Arabidopsis thaliana, Oxylipins, Glucuronidase, Methyl jasmonate, biology, Arabidopsis Proteins, Lateral root, fungi, Amine oxidase (copper-containing), food and beverages, Water, Plant Transpiration, biology.organism_classification, Hydrogen peroxide, Plants, Genetically Modified, Apoplast, Article Addendum, Plant Leaves, chemistry, Biochemistry, Plant Stomata, Amine Oxidase (Copper-Containing), Oxidoreductases, Methyl sasmonate
Abstract

Copper amine oxidases oxidize the polyamine putrescine to 4-amino-and guard cells during acclimation to adverse environmental conditions. butanal with the production of the plantsignal molecule hydrogen peroxide (H2O2) and ammonia. The Arabidopsis (Arabidopsis thaliana) gene At4g14940 (AtAO1, previously referred to as ATAO1) encodes an apoplastic copper amine oxidase expressed in lateral root cap cells and developing xylem, especially in root protoxylem and metaxylem precursors. In our recent study, we demonstrated that AtAO1 expression is strongly induced in the root vascular tissues by the wound-signal hormone methyl jasmonate (MeJA). Furthermore, we also demonstrated that the H2O2 derived by the AtAO1-driven oxidation of putrescine, mediates the MeJA-induced early protoxylem differentiation in Arabidopsis roots. H2O2 may contribute to protoxylem differentiation by signaling developmental cell death and by acting as co-substrate in peroxidase-mediated cell wall stiffening and lignin polymerization. Here, by the means of AtAO1 promoter:: green fluorescent protein-b-glucuronidase (AtAO1::GFP-GUS) fusion analysis, we show that a strong AtAO1 gene expression occurs also in guard cells of leaves and flowers. The high expression levels of AtAO1 in tissues or cell types regulating water supply and water loss may suggest a role of the encoded protein in water balance homeostasis, by modulating coordinated adjustments in anatomical and functional features of xylem tissue

Published
2015

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