Abstract
Ever since its discovery, abscisic acid (ABA) has been intensively studied due to its versatile functions in plant developmental and physiological processes. Many signaling details of ABA have been well elucidated and reviewed. The identification of ABA receptors is a great breakthrough in the field of ABA study, whereas the discovery of ABA transporter has changed our concept that ABA is delivered solely by passive transport. The intensity of ABA signaling pathway is well known to be controlled by multi-regulators. Nonetheless, the interaction and coordination among ABA biosynthesis, catabolism, conjugation and transportation are seldom discussed. Here, we summarize the biological functions of ABA in response to different stresses, especially the roles of ABA in plant defense to pathogen attack, and discuss the possible relationships of these determinants in controlling the specificity and intensity of ABA signaling pathway in the rice.
Highlights
Abscisic acid (ABA) is a plant stress hormone and one of the foremost important signaling molecules in plants, which plays versatile functions in regulating many developmental processes and adaptive stress processes (Santner et al, 2009; Cutler et al, 2010)
Like Arabidopsis, the NCED3 gene is significantly induced by water stress, which is responsible for the dramatically increase of abscisic acid (ABA) level in rice and Arabidopsis exposed to water stress (Tan et al, 2003; Ye et al, 2011)
Pharmacological experiments proved that ABA biosynthesis in root required the xanthophyll precursors transported from leaves (Ren et al, 2006), indicating that an accelerated catabolic rate of ABA is favorable for providing the law materials for de novo synthesis of ABA in root and that root is critical in positioning ABA for rapid early adaptive responses in condition when ABA is needed
Summary
Abscisic acid (ABA) is a plant stress hormone and one of the foremost important signaling molecules in plants, which plays versatile functions in regulating many developmental processes and adaptive stress processes (Santner et al, 2009; Cutler et al, 2010). Like Arabidopsis, the NCED3 gene is significantly induced by water stress, which is responsible for the dramatically increase of ABA level in rice and Arabidopsis exposed to water stress (Tan et al, 2003; Ye et al, 2011).
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