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WRKY54 and WRKY70 co-operate as negative regulators of leaf senescence in Arabidopsis thaliana by Sébastien Besseau; Jing Li; E. Tapio Palva is a Agricultural and Biological Sciences article available to read on EtoBox.

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The plant-specific WRKY transcription factor (TF) family with 74 members in __Arabidopsis thaliana__ appears to be involved in the regulation of various physiological processes including plant defence and senescence. WRKY53 and WRKY70 were previously implicated as positive and negative regulators of senescence, respectively. Here the putative function of other WRKY group III proteins in __Arabidopsis__ leaf senescence has been explored and the results suggest the involvement of two additional WRKY TFs, WRKY 54 and WRKY30, in this process. The structurally related __WRKY54__ and __WRKY70__ exhibit a similar expression pattern during leaf development and appear to have co-operative and partly redundant functions in senescence, as revealed by single and double mutant studies. These two negative senescence regulators and the positive regulator WRKY53 were shown by yeast two-hydrid analysis to interact independently with WRKY30. __WRKY30__ was expressed during developmental leaf senescence and consequently it is hypothesized that the corresponding protein could participate in a senescence regulatory network with the other WRKYs. Expression in wild-type and salicylic acid-deficient mutan

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Author

Sébastien Besseau; Jing Li; E. Tapio Palva

Publisher

Oxford University Press (OUP)

Published

2012

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)