Calcium elevation‐dependent and attenuated resting calcium‐dependent abscisic acid induction of stomatal closure and abscisic acid‐induced enhancement of calcium sensitivities of S‐type anion and inward‐rectifying K⁺ channels in Arabidopsis guard cells

Abstract

SUMMARYStomatal closure in response to abscisic acid depends on mechanisms that are mediated by intracellular [Ca 2+

Control of stomatal aperture

“…18 Under drought and high salinity conditions the levels of ABA increase in the roots which is perceived by the guard cells where it triggers changes in ion fluxes leading to stomata closure and inhibiting stomatal opening. 38,54,55 Altogether these effects minimize water loss and allow plants to cope with drought episodes.…”

Plant Stress Surveillance Monitored by ABA and Disease Signaling Interactions

“…For example, pre-exposure to high Ca 2+ concentration is required to produce activation of cytosolic Ca 2+ -induced S-type anion channels (Allen et al, 2002). ABA pre-treatment to guard cells augments the cytosolic Ca 2+ -induced S-type anion channel activation (Chen et al, 2010;Siegel et al, 2009). This calcium sensitivity priming hypothesis can offer an explanation how different sources of cytosolic Ca 2+ transients can antagonistically control ABA and disease signal transduction.…”

Alteration ofArabidopsis SLAC1promoter and its association with natural variation in drought tolerance

“…The release of anions from the guard cells through these channels and the following release of potassium ions through potassium channels reduce turgor pressure in the cells. 33 Thus, SLAC1 was a good candidate for the gene that contributes to the difference in drought tolerance between Col-0 and Ws-2 by controlling stomatal response.…”