Document Detail


Male gametophyte-specific WRKY34 transcription factor mediates cold sensitivity of mature pollen in Arabidopsis.
MedLine Citation:
PMID:  20643804     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Mature pollen is very sensitive to cold stress in chilling-sensitive plants. Plant WRKY DNA-binding transcription factors are key regulators in plant responses to abiotic and biotic stresses. Previous studies have suggested that WRKY34 (At4g26440) gene might be involved in pollen viability, although the mechanism involved is unclear. In this study, it is shown that cold treatment increased WRKY34 expression in the wild type, and promoter-GUS analysis revealed that WRKY34 expression is pollen-specific. Enhanced green fluorescent protein-tagged WRKY34 was localized in the nuclei. Pollen harbouring the wrky34 allele showed higher viability than pollen with the WRKY34 allele after cold treatment. Further functional analysis indicated that the WRKY34 transcription factor was involved in pollen development regulated by the pollen-specific MIKC* class of MADS-domain transcription factors under cold stress, and cold-insensitivity of mature wrky34 pollen might be partly attributable to the enhanced expression of transcriptional activator CBFs in the mutants. Thus, the WRKY34 transcription factor negatively mediated cold sensitivity of mature Arabidopsis pollen and might be involved in the CBF signal cascade in mature pollen.
Authors:
Changsong Zou; Wenbo Jiang; Diqiu Yu
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-07-19
Journal Detail:
Title:  Journal of experimental botany     Volume:  61     ISSN:  1460-2431     ISO Abbreviation:  J. Exp. Bot.     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-09-09     Completed Date:  2010-10-05     Revised Date:  2013-05-29    
Medline Journal Info:
Nlm Unique ID:  9882906     Medline TA:  J Exp Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  3901-14     Citation Subset:  IM    
Affiliation:
Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan 650223, PR China.
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MeSH Terms
Descriptor/Qualifier:
Arabidopsis / genetics*,  growth & development,  metabolism
Arabidopsis Proteins / genetics,  metabolism,  physiology*
Cold Temperature*
Gene Expression Regulation, Plant
Germ Cells, Plant / metabolism*
Plants, Genetically Modified / genetics,  metabolism
Pollen / genetics*,  metabolism
Regulatory Sequences, Nucleic Acid
Signal Transduction
Transcription Factors / genetics,  metabolism,  physiology*
Chemical
Reg. No./Substance:
0/Arabidopsis Proteins; 0/Transcription Factors; 0/WRKY34 protein, Arabidopsis
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