摘要
WRKY转录因子是植物体内一类比较大的转录因子家族,它在植物的生长发育以及抗逆境反应中起着非常重要的作用。综述了WRKY转录因子在植物应对冻害、干旱、盐害等非生物胁迫与病原菌、虫害等生物胁迫反应中的重要调控功能,并概括了WRKY转录因子在调控这些逆境反应中的机制。
Abstract： WRKY proteins, which contain one or two high conserved WRKYGQK peptide sequence and a zinc finger motif, are a large family of transcription factors （ TFs ） in plants. There are 74 and 109 WRKY TFs in Arabidopsis and rice, respectively. WRKY TFs regulate expression of genes by binding to W-box in the promoters of the target genes. It has been well documented that WRKY TFs play important roles in plant growth and development, such as lateral root development, senescence, trichome and seed coat development, sugar metabolism, sesquiterpene synthesized and seed germination, and responses to various abiotie and biotic stresses. In this paper, the roles of WRKY TFs in plant stress responses and their regulation mechanism were summarized. Up to now, 10 WRKY TFs have been found to be involved in plant responses against abiotic stresses, including cold, drought, salinity and phosphate starvation, and near 30 WRKY TFs have been reported to function in plant defense against pathogens and herbivores. The WRKY TFs, as positive or negative regulators, can manipulate a lot of processes in plant stress responses by joining the signaling pathways. They may localize upstream or downstream of the signaling pathways, and thus involve in early or late events of the plant stress response. Several WRKY TFs in Arabidopsis and tobacco, for example, AtWRKY53 and AtWRKY33, have been proven to be downstream of MAPK cascades that play important roles in plant development and defense response. Plant can activate hormone signaling pathways when suffered from pathogens or herbivores, and jasmonic acid （JA）, salicylic acid （SA）, and ethylene （ET） are the three most known defense signal molecules in plants. SA-dependent defense pathway plays a central role in pathogen-induced systemic acquired resistance （SAR） and NPR1 is a key regulator of SAR downstream of SA. In Arabidopsis, rice and tobacco, some WRKY TFs lying upstream or downstream of NPR1 are involved in NPRl-mediated defense responses, and thus regulate pla
出处
《生态学报》
CAS
CSCD
北大核心
2011年第11期3223-3231,共9页
Acta Ecologica Sinica
基金
浙江省科技厅项目(2006C22003
2006C30040)
关键词
WRKY转录因子
逆境
调控功能
机制
WRKY transcription factor
stress
regulating function
mechanism
