ABA signal transduction from ABA receptors to ion channels

다국어 초록 (Multilingual Abstract)

The plant hormone abscisic acid (ABA) is involved in regulating a number of major processes such as seed dormancy, seedling development, and biotic and abiotic stress responses. The function and effect of ABA on pathogens are still unclear,but the roles of ABA in seed germination and abiotic stress responses have been well characterized.Abiotic stresses elevate ABA levels and activate ABA signaling; thus, inducing a variety of responses, including the expression of stress-related genes and stomatal closure. The past decade has witnessed many significant advances in our understanding of ABA signal transduction due to application of a combination of approaches including genetics, biochemistry, electrophysiology, and chemical genetics. A number of proteins associated with the ABA signal transduction pathway such as PYR/PYL/RCAR family of START proteins, have been identified. These ABA receptors bind to ABA and positively regulate ABA signaling via inactivation of PP2C phosphatase activity, which inhibits SnRK2-type kinases by direct interaction and dephosphorylation.
Additionally, SnRK2-type kinases and PP2Cs interact with one another and with other components of ABA signaling and function as positive and negative ABA regulators,respectively. In this review, we focus on ABA function to abiotic stresses and highlight each component in relation to ABA and its interactions.

참고문헌 (Reference)

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