Osmosensor-mediated control of Ca²⁺ spiking in pollen germination.

ABSTRACT: Higher plants survive terrestrial water deficiency and fluctuation by arresting cellular activities (dehydration) and resuscitating processes (rehydration). However, how plants monitor water availability during rehydration is unknown. Although increases in hypo-osmolarity-induced cytosolic Ca²⁺ concentration (HOSCA) have long been postulated to be the mechanism for sensing hypo-osmolarity in rehydration^1,2, the molecular basis remains unknown. Because osmolarity triggers membrane tension and the osmosensing specificity of osmosensing channels can only be determined in vivo^3-5, these channels have been classified as a subtype of mechanosensors. Here we identify bona fide cell surface hypo-osmosensors in Arabidopsis and find that pollen Ca²⁺ spikin

SUBMITTER: Pei S 

PROVIDER: S-EPMC11136663 | biostudies-literature | 2024 May

REPOSITORIES: biostudies-literature