Recent advances in phytohormone abscisic acid receptor–coupled pathway 植物激素脱落酸受体偶联途径研究进展

Abscisic acid (ABA) is one of the five “classical” plant hormones. The ABA receptor–coupled core signaling pathway mainly composes ABA receptor PYR1/PYLs/RCARs, clade A PP2C protein phosphatases, and protein kinase SnRK2s. Mainly though activating or inhibiting SnRK2 kinase, these components turn “on” or “off” downstream ABA response. In the absence of ABA, PP2Cs bind to and inhibit SnRK2s. Stress induces the accumulation of ABA, and ABA binds to its receptors and inhibits PP2Cs, releasing SnRK2s from inhibition. Recent studies suggest that B subgroup RAF kinases phosphorylate and reactivate the dephosphorylated inactive SnRK2s and initiate ABA signaling. In this review, we summarize core components in ABA receptor–coupled core signaling pathway and mainly focus on the recent progress in this field.