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    The roles of two transcription factors, ABI4 and CBFA, in ABA and plastid signalling and stress reponses

    数:2013-10-17 15:25:54 来源: chaopeng97免费的女人 生态环境研究所

    The roles of two transcription factors, ABI4 and CBFA, in ABA and plastid signalling and stress reponses. Plant Molecular Biology, 2013,83:445-458.

    Zhang ZW1,2, Feng LY2, Yuan S1,2

    1 Institute of Ecological and Environmental Scicences, Sichaun Agricultural University

    2 College of Resources and Environment, Sichuan Agricultrual University

    Abstract: 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 longlasting. 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 stressresponsive genes (including the transcription co-factor CBP) is improved instantaneously. abi4, cbfAandcbpmutants showed weaker drought-tolerance after a herbicide norflurazon treatment, which indicated the physiological role of these key transcription factors.

    Key words: Transcription factor, ABI4, CBFA, GUN1, Plastid signalling, Tetrapyrroles

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