Constitutive activation of calcium-dependent protein kinase 3 confers a drought tolerance by inhibiting inward K+ channel KAT1 and stomatal opening in Arabidopsis

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2018,（16）
• 页码范围: 1037-1039
• 页数: 3页
• 语种: 英文

摘要

The changes of turgor pressure in guard cells resulted from the massive fluxes of osmotic ions into and out of guard cells through ion channels and transporters are the main driving force for stomatal movement [1].The massive efflux of diverse osmotic anions are mainly mediated by slow and rapid anion channels for stomatal closure,whereas the influx of K+,the main osmotic cation and the counter ion of the diverse anions in guard cells,are mainly through inward K+ (K+in) channels [1].K+in channels in guard cells are homoand/or hetero-tetramers assembled with a few members of Shaker family in Arabidopsis,including AKT1,AKT2,AtKC1,KAT1 and KAT2,out of which KAT1 is the main one [2].Cytosolic Ca2+ is involved in stomatal movement as an important second messenger in diverse stimuli-induced stomatal movement,and also plays an essential role in the cross-talks between different signaling pathways.