Functional analysis of Arabidopsis WRKY63 in salt stress response and flowering time control
Date Issued
2015
Date
2015
Author(s)
Shih, Wei-Ting
Abstract
WRKY transcription factors constitute a large protein family in plants. Previous studies indicated that WRKY transcription factors play important roles in the regulation of gene expression associated with plant defense responses, but the role of WRKY proteins in abiotic stress responses and development is still unclear. In this study, we show that WRKY63, a member of WRKY IIIa subfamily, could interact with the RPD3-like histone deacetylase HDA6. The WRKY63 T-DNA insertion knock-out mutant, abo3, is hypersensitive to ABA and salt stress. Furthermore, abo3/axe1-5 double mutant plants displayed increased salt sensitivity compared with abo3 and axe1-5 plants. In addition, the abo3 mutant showed the early flowering phenotype compared with wild type plants. The expression levels of salt stress-responsive genes as well as genes involved in flowering time control were changed in the abo3 mutants. These data suggested that WRKY63 plays an important role in the regulation of gene expression involved in salt stress responses and flowering time control.
Subjects
Arabidopsis
histone deacetylases
salt stress
flowering time
Type
thesis
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