The Calcium-Dependent Protein Kinase CPK33 Mediates Strigolactone-Induced Stomatal Closure in Arabidopsis thaliana.

ABSTRACT: Strigolactones (SLs) are known to mediate plant acclimation to environmental stress. We recently reported that SLs acted as prominent regulators in promotion of stomatal closure. However, the detailed mechanism by which SLs induce stomatal closure requires further investigation. Here we studied the essential role of the calcium (Ca2+) signal mediating by the calcium-dependent protein kinase (CPK) in SL-induced stomatal closure. SL-induced stomatal closure was strongly inhibited by a Ca2+ chelator and Ca2+ channel blockers, indicating that Ca2+ functions in SL promotion of stomatal closure. Through examining a collection of cpk mutants, we identified CPK33, potentially acting as a Ca2+ transducer, which is implicated in guard cell SL signaling. SL- and Ca2+-induced stomatal closure were imp

SUBMITTER: Wang X 

PROVIDER: S-EPMC6928132 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature