Terrestrial plants must cope with drought stress to survive. Under drought stress, plants accumulate the phytohormone abscisic acid （ABA） by increasing its biosynthesis and decreasing its catabolism. However, the re...Terrestrial plants must cope with drought stress to survive. Under drought stress, plants accumulate the phytohormone abscisic acid （ABA） by increasing its biosynthesis and decreasing its catabolism. However, the regulatory pathways controlling ABA catabolism in response to drought remain largely unclear. Here, we report that the flowering repressor SHORT VEGETATIVE PHASE （SVP） is induced by drought stress and associates with the promoter regions of the ABA catabolism pathway genes CYP707A 1, CYP707A3 and AtBG1, causing decreased expression of CYP7OTA 1 and CYP707A3 but enhanced expression ofAtBG1 inArabidopsis leaves. Loss-of-function mutations in CYP707A 1 and CYP707A3 or overexpression of AtBG1 could rescue the drought-hypersensitive phenotype of svp mutant plants by increasing cellular ABA levels. Collectively, our results suggest that SVP is a central regulator of ABA catabolism and that a regulatory pathway involving SVP, CYP707A1/3, and AtBG1 plays a critical role in plant response to water deficit and plant drought resistance.展开更多
文摘Terrestrial plants must cope with drought stress to survive. Under drought stress, plants accumulate the phytohormone abscisic acid （ABA） by increasing its biosynthesis and decreasing its catabolism. However, the regulatory pathways controlling ABA catabolism in response to drought remain largely unclear. Here, we report that the flowering repressor SHORT VEGETATIVE PHASE （SVP） is induced by drought stress and associates with the promoter regions of the ABA catabolism pathway genes CYP707A 1, CYP707A3 and AtBG1, causing decreased expression of CYP7OTA 1 and CYP707A3 but enhanced expression ofAtBG1 inArabidopsis leaves. Loss-of-function mutations in CYP707A 1 and CYP707A3 or overexpression of AtBG1 could rescue the drought-hypersensitive phenotype of svp mutant plants by increasing cellular ABA levels. Collectively, our results suggest that SVP is a central regulator of ABA catabolism and that a regulatory pathway involving SVP, CYP707A1/3, and AtBG1 plays a critical role in plant response to water deficit and plant drought resistance.
