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Transcription factor WRKY8 functions antagonistically with its interacting partner VQ9 to modulate salinity stress tolerance
Hu Yanru; Chen Ligang; Wang Houping; Zhang Liping; Wang Fang; Yu Diqiu.
2013
Source PublicationThe Plant Journal
Volume74Issue:3Pages:730-745
AbstractThe WRKY transcription factors have been demonstrated to play crucial roles in regulating stress responses; however, the exact mechanisms underlying their involvement in stress responses are not fully understood. Arabidopsis WRKY8 was predominantly expressed in roots and was highly upregulated by salt treatment. Disruption of WRKY8 rendered plants hypersensitive to salt, showing delayed germination, inhibited post-germination development and accelerated chlorosis. Further investigation revealed that WRKY8 interacted with VQ9, and their interaction decreased the DNA-binding activity of WRKY8. The VQ9 protein was exclusively localized in the nucleus, and VQ9 expression was strongly responsive to NaCl treatment. Mutation of VQ9 enhanced tolerance to salt stress, indicating that VQ9 acts antagonistically with WRKY8 to mediate responses to salt stress. The antagonist functions of WRKY8 and VQ9 were consistent with an increased or reduced Na/K concentration ratio, as well as contrasting expression patterns of downstream stress-responsive genes in salt-stressed wrky8 and vq9 mutants. Moreover, chromatin immunoprecipitation (ChIP) assays showed that WRKY8 directly bound the promoter of RD29A under salt conditions. These results provided strong evidence that the VQ9 protein acts as a repressor of the WRKY8 factor to maintain an appropriate balance of WRKY8-mediated signaling pathways to establish salinity stress tolerance.
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/10077
Collection植物分子生物学研究组
Corresponding AuthorYu Diqiu.
Recommended Citation
GB/T 7714
Hu Yanru,Chen Ligang,Wang Houping,et al. Transcription factor WRKY8 functions antagonistically with its interacting partner VQ9 to modulate salinity stress tolerance[J]. The Plant Journal,2013,74(3):730-745.
APA Hu Yanru,Chen Ligang,Wang Houping,Zhang Liping,Wang Fang,&Yu Diqiu..(2013).Transcription factor WRKY8 functions antagonistically with its interacting partner VQ9 to modulate salinity stress tolerance.The Plant Journal,74(3),730-745.
MLA Hu Yanru,et al."Transcription factor WRKY8 functions antagonistically with its interacting partner VQ9 to modulate salinity stress tolerance".The Plant Journal 74.3(2013):730-745.
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