Chinese Bulletin of Botany ›› 2011, Vol. 46 ›› Issue (4): 361-369.DOI: 10.3724/SP.J.1259.2011.00361
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Dapeng Zhang*
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Abstract: We give a brief review of the advances in studies of ABAR/CHLH-mediated abscisic acid (ABA) sensing and downstream signaling from early events starting from plastids/chloroplasts to downstream gene expression. ABAR spans the chloroplast envelope, and the cytosolic C terminus of ABAR interacts with a group of WRKY transcription factors, WRKY40, WRKY18, and WRKY60, which function as negative regulators of ABA signaling in seed germination and post-germination growth. WRKY40, a central negative regulator, inhibits the expression of ABA-responsive genes such as ABF4, ABI4, ABI5, and MYB2. In response to an ABA signal that recruits WRKY40 from the nucleus to the cytosol and promotes ABAR-WRKY40 interaction, ABAR relieves ABA-responsive genes of inhibition by repressing WRKY40 expression. These findings uncover a novel ABA signaling pathway from the early signaling events to downstream gene expression. We also discuss future studies needed to understand the complex ABAR-mediated ABA signaling pathway(s).
Dapeng Zhang. An Abscisic Acid Signaling Pathway Starting from Plastid/Chloroplast[J]. Chinese Bulletin of Botany, 2011, 46(4): 361-369.
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URL: https://www.chinbullbotany.com/EN/10.3724/SP.J.1259.2011.00361
https://www.chinbullbotany.com/EN/Y2011/V46/I4/361