The roles of two transcription factors, ABI4 and CBFA, in ABA and plastid signalling and stress responses
文献类型： 外文期刊
作者： Zhang, Zhong-Wei 1 ; Feng, Ling-Yang 1 ; Cheng, Jian 2 ; Tang, He 2 ; Xu, Fei 2 ; Zhu, Feng 2 ; Zhao, Zhong-Yi 2 ; Yuan, 1 ;
作者机构： 1.Sichuan Agr Univ, Coll Resources & Environm Sci, Chengdu 611130, Peoples R China
2.Sichuan Univ, Coll Life Sci, Minist Educ, Key Lab Bioresource & Ecoenvironm, Chengdu 610064, Peoples R China
3.Sichuan Agr Univ, Coll Biol & Sci, Yaan 625014, Peoples R China
4.Sichuan Agr Univ, Coll Biol & Sci, Yaan 625014, Peopl
关键词： ABI4;CBFA;GUN1;Plastid signaling;Tetrapyrroles;Transcription factor
期刊名称：PLANT MOLECULAR BIOLOGY （ 影响因子：4.076； 五年影响因子：4.89 ）
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收录情况： SCI
摘要： Genetic and physiological studies have revealed evidences for multiple signaling pathways by which the plastid exerts retrograde control over photosynthesis-associated-nuclear-genes. In this study we have examined the mechanisms of control of transcription by plastid signals, focusing on transcription factors. We have also further addressed the physical nature of plastid signals and the physiological role, in stress acclimation of this regulatory pathway. ABI4, a master Apetala 2 (AP2)-type transcription factor (TF), is targeted by multiple signalling pathways in plant cells, such as abscisic acid (ABA) signals, sugar signals and plastid signals derived from reactive oxygen species (ROS) and chlorophyll intermediates. ABI4 binds the promoter of target genes to prevent their transcription by competing with other competitive TFs. However, we found that once ABI4 bound the element (CCACGT), it may not be bound by other TFs, therefore making the signalling long-lasting. Downstream of ABI4, CBFA (CCAAT binding factor A) is a subunit of the HAP2/HAP3/HAP5 (Heme activator protein) trimeric transcription complex. CBFA however is a redundant HAP3 subunit. When emergency occurs (such as herbicide treatments or environmental stresses followed by ABA and ROS accumulation), the master transcription factor ABI4 down-regulates some TFs, like CBFA, and then some other TF subunits enter the transcription complex and transcriptional efficiency of stress-responsive genes (including the transcription co-factor CBP) is improved instantaneously. abi4, cbfA and cbp mutants showed weaker drought-tolerance after a herbicide norflurazon treatment, which indicated the physiological role of these key transcription factors.
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