Arabidopsis COP1 guides stomatal response in guard cells through pH regulation.

ABSTRACT: Plants rely on precise regulation of their stomatal pores to effectively carry out photosynthesis while managing water status. The Arabidopsis CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1), a critical light signaling repressor, is known to repress stomatal opening, but the exact cellular mechanisms remain unknown. Here, we show that COP1 regulates stomatal movement by controlling the pH levels in guard cells. cop1-4 mutants have larger stomatal apertures and disrupted pH dynamics within guard cells, characterized by increased vacuolar and cytosolic pH and reduced apoplastic pH, leading to abnormal stomatal responses. The altered pH profiles are attributed to the increased plasma membrane (PM) H⁺-ATPase activity of cop1-4 mutants. Moreover, cop1-4 mutants resist to growth defect caused

SUBMITTER: Cha S 

PROVIDER: S-EPMC10844630 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature