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https://hdl.handle.net/20.500.14279/3207
Τίτλος: | Altered apoplastic ascorbate redox state in tobacco plants via ascorbate oxidase overexpression results in delayed dark-induced senescence in detached leaves | Συγγραφείς: | Fotopoulos, Vasileios Kanellis, Angelos K. |
Major Field of Science: | Natural Sciences | Field Category: | Biological Sciences | Λέξεις-κλειδιά: | Oxidative stress;Senescence;Ascorbate oxidase;Transgenic plants;Hydrogen peroxide | Ημερομηνία Έκδοσης: | Δεκ-2013 | Πηγή: | Plant Physiology and Biochemistry,2013, vol. 73, pp. 154-160 | Volume: | 73 | Start page: | 154 | End page: | 160 | Περιοδικό: | Plant Physiology and Biochemistry | Περίληψη: | Ascorbate oxidase (AO) is an apoplastic enzyme that uses oxygen to catalyse the oxidation of ascorbate (AA) to dehydroascorbate (DHA) via the unstable radical monodehydroascorbate (MDHA). Here, we report that transgenic tobacco plants (Nicotiana tabacum L. cv. Xanthi) with an in vivo lowered apoplastic AA redox state through increased AO expression demonstrate signs of delayed dark-induced senescence compared with wild-type plants, as shown by chlorophyll loss assay. In situ localization of hydrogen peroxide (H2O2) suggests that, although transgenic plants have higher constitutive levels of H2O2 under normal growth conditions, imposed dark-induced senescence results in smaller induction levels of H2O2, an observation which correlates with increased antioxidant enzyme activities and an induction in the expression of AA recycling genes compared with that in wild-type plants. Our current findings, combined with previous studies which showed the contribution of AO in the regulation of AA redox state, suggest that the reduction in AA redox state in the leaf apoplast of these transgenic plants results in an increase in the endogenous levels of H2O2, which provides a form of ‘acquired tolerance’ to oxidative stress imposed by dark-induced senescence. | URI: | https://hdl.handle.net/20.500.14279/3207 | ISSN: | 09819428 | DOI: | 10.1016/j.plaphy.2013.09.002 | Rights: | © Elsevier | Type: | Article | Affiliation: | Cyprus University of Technology Aristotle University of Thessaloniki |
Publication Type: | Peer Reviewed |
Εμφανίζεται στις συλλογές: | Άρθρα/Articles |
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