Calcium signals in guard cells enhance the efficiency by which abscisic acid triggers stomatal closure.

ABSTRACT: During drought, abscisic acid (ABA) induces closure of stomata via a signaling pathway that involves the calcium (Ca²⁺ )-independent protein kinase OST1, as well as Ca²⁺ -dependent protein kinases. However, the interconnection between OST1 and Ca²⁺ signaling in ABA-induced stomatal closure has not been fully resolved. ABA-induced Ca²⁺ signals were monitored in intact Arabidopsis leaves, which express the ratiometric Ca²⁺ reporter R-GECO1-mTurquoise and the Ca²⁺ -dependent activation of S-type anion channels was recorded with intracellular double-barreled microelectrodes. ABA triggered Ca²⁺ signals that occurred during the initiation period, as well as in the acceleration phase of stomatal closure. However, a subse

SUBMITTER: Huang S 

PROVIDER: S-EPMC6771588 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature