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Heterologous expression of OsWRKY23 gene enhances pathogen defense and dark-induced leaf senescence in Arabidopsis

Heterologous expression of OsWRKY23 gene enhances pathogen defense and dark-induced leaf... WRKY proteins are a superfamily of plant transcriptional factors with potential regulatory roles pertaining to a variety of biotic and abiotic stress responses. In this study, we investigated the expression profiles of OsWRKY23 under different developmental stages, pathogen infection, continuous-dark and hormone treatments. Under normal growth conditions, OsWRKY23 expressed exclusively in roots and senescing leaves. Under biotic and abiotic stresses treatments, OsWRKY23 was markedly induced by continuous-dark-induced leaf senescence and infection by rice pathogen Pyricularia oryzae Cav as well as salicylic acid (SA). Further analysis of 35S:OsWRK23 Arabidopsis plants showed that over-expression of OsWRKY23 resulted in enhanced expression of the pathogenesis-related (PR) genes and increased resistance to the bacterial pathogen Pseudomanas syringae. Furthermore, over-expression of OsWRKY23 accelerated leaf senescence in darkness. The senescence-associated marker genes SAG12 and SEN1 were altered in darkness in 35S:WRKY23 Arabidopsis plants. In conclusion, these results suggest that OsWRKY23 is a novel modulator of pathogen responses as well as dark-induced leaf senescence. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Growth Regulation Springer Journals

Heterologous expression of OsWRKY23 gene enhances pathogen defense and dark-induced leaf senescence in Arabidopsis

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References (52)

Publisher
Springer Journals
Copyright
Copyright © 2009 by Springer Science+Business Media B.V.
Subject
Life Sciences; Agriculture; Plant Physiology; Plant Anatomy/Development; Plant Sciences
ISSN
0167-6903
eISSN
1573-5087
DOI
10.1007/s10725-009-9366-z
Publisher site
See Article on Publisher Site

Abstract

WRKY proteins are a superfamily of plant transcriptional factors with potential regulatory roles pertaining to a variety of biotic and abiotic stress responses. In this study, we investigated the expression profiles of OsWRKY23 under different developmental stages, pathogen infection, continuous-dark and hormone treatments. Under normal growth conditions, OsWRKY23 expressed exclusively in roots and senescing leaves. Under biotic and abiotic stresses treatments, OsWRKY23 was markedly induced by continuous-dark-induced leaf senescence and infection by rice pathogen Pyricularia oryzae Cav as well as salicylic acid (SA). Further analysis of 35S:OsWRK23 Arabidopsis plants showed that over-expression of OsWRKY23 resulted in enhanced expression of the pathogenesis-related (PR) genes and increased resistance to the bacterial pathogen Pseudomanas syringae. Furthermore, over-expression of OsWRKY23 accelerated leaf senescence in darkness. The senescence-associated marker genes SAG12 and SEN1 were altered in darkness in 35S:WRKY23 Arabidopsis plants. In conclusion, these results suggest that OsWRKY23 is a novel modulator of pathogen responses as well as dark-induced leaf senescence.

Journal

Plant Growth RegulationSpringer Journals

Published: Feb 26, 2009

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