New developments in abscisic acid perception and metabolism.
Abscisic acid is a powerful signaling molecule that accumulates in response to abiotic stress. However, no potential receptors that could perceive this increase in abscisic acid had been identified until recent reports of three abscisic acid binding proteins: the nuclear protein Flowering Time Control Locus A, the chloroplast protein Magnesium Protoporphyrin-IX Chelatase H subunit, and the membrane-associated protein G Protein Coupled Receptor 2. Abscisic acid metabolism also has a new and prominent component with the identification of a beta-glucosidase capable of releasing biologically active abscisic acid from inactive abscisic acid-glucose ester in a stress-inducible manner. These observations refocus our attention on the metabolism underlying abscisic acid accumulation, sites of abscisic acid perception, and delivery of abscisic acid to those sites.
Verslues
Paul E
PE
Institute for Integrative Genome Biology and Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA. paulv@gate.sinica.edu
Zhu
Jian-Kang
JK
D000040:Abscisic Acid / Q000378:metabolism*; D010944:Plants / Q000378:metabolism*; D015398:Signal Transduction
D000040:Abscisic Acid