Contribution of ABA UDP-glucosyltransferases in coordination of ABA biosynthesis and catabolism for ABA homeostasis

Plant Signaling & Behavior
Ting Dong, Inhwan Hwang

Abstract

The phytohormone abscisic acid (ABA) plays a crucial role in numerous aspects of plant growth and environmental stress responses. Endogenous ABA levels are regulated by a balance between its biosynthetic and catabolic activities. This balance may occur at multiple levels and includes the expression of genes involved in these processes. ABA UDP-glucosyltransferase (UGT), the major player in the ABA conjugation pathway, has been shown to have a marginal effect on free ABA levels. However, recent studies provide new insight into the importance of the ABA conjugation pathway in contributing to the control of ABA homeostasis. Gain-of-function and loss-of-function mutant analyses have revealed that UGT71B6, an ABA UGT, and its 2 closely related homologs, UGT71B7 and UGT71B8, play a crucial role in ABA homeostasis and in adaptation to various abiotic stresses.

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Citations

Nov 29, 2014·Applied Microbiology and Biotechnology·Wilfried SchwabMatthias Wüst
Jun 22, 2020·Plant Science : an International Journal of Experimental Plant Biology·Liuchun FengBaoliang Zhou

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