title: Mechanisms for calcium sensing receptor-regulated stomatal closure in response to the extracellular calcium signal.
abstract: In Arabidopsis, extracellular calcium (Ca²⁺(o)) promotes intracellular calcium (Ca²⁺(i)) transients and stomatal closure, which has been found to be regulated by the calcium sensing receptor (CAS). However, the detailed pathways for transducting the Ca²⁺(o) signal by CAS are still unclear. We found that nitric oxide (NO) and the hydrogen peroxide (H₂O₂) accumulated in the guard cell chloroplast were the two elements that act downstream of the CAS signaling and trigger the stomatal closure by prolonging Ca²⁺(i) transients. Here we provide more commentary on CAS-regulated H₂O₂ generation from chloroplast and Ca²⁺(i) transients in response to Ca²⁺(o), as well as other potential mechanisms that may be involved in the CAS signaling pathway.
authors.affiliation: Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, China.
authors.forename: Wen-Hua
authors.initials: WH
authors.lastname: Wang
authors.forename: Hai-Lei
authors.initials: HL
authors.lastname: Zheng
mesh_terms: D017360:Arabidopsis / Q000378:metabolism / Q000502:physiology*; D002118:Calcium / Q000378:metabolism*; D002736:Chloroplasts / Q000378:metabolism*; D006861:Hydrogen Peroxide / Q000378:metabolism*; D009569:Nitric Oxide / Q000378:metabolism*; D054046:Plant Stomata / Q000378:metabolism / Q000502:physiology*; D044169:Receptors, Calcium-Sensing / Q000378:metabolism*; D015398:Signal Transduction
chemical_list: D044169:Receptors, Calcium-Sensing; D009569:Nitric Oxide; D006861:Hydrogen Peroxide; D002118:Calcium