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The plant hormone abscisic acid (ABA) plays a major role in seed maturation and germination, as well as in adaptation to abiotic environmental stresses. ABA promotes stomatal closure by rapidly altering ion fluxes in guard cells. Other ABA actions involve modifications of gene expression, and the analysis of ABA-responsive promoters has revealed a diversity of potential cis-acting regulatory elements. The nature of the ABA receptor(s) remains unknown. In contrast, combined biophysical, genetic, and molecular approaches have led to considerable progress in the characterization of more downstream signaling elements. In particular, substantial evidence points to the importance of reversible protein phosphorylation and modifications of cytosolic calcium levels and pH as intermediates in ABA signal transduction. Exciting advances are being made in reassembling individual components into minimal ABA signaling cascades at the single-cell level.
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| http://dx.doi.org/10.1146/annurev.arplant.49.1.199 | DOI Listing |
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We speak with Chunzhao Zhao about his enthusiasm to become a scientist and his scientific interest in understanding plant stress resistance to facilitate crop breeding. He discusses his lab's recent Cell Reports paper on FERONIA-mediated phosphorylation cascade in abscisic acid signaling and seed germination.
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