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The SnRK protein kinase OST1 has long been recognized as a key regulator of guard cell responses that integrates signals from most closure-inducing cues tested to date (Melotto et al., 2006; Vahisalu et al., 2010; Xue et al., 2011; Merilo et al., 2013; Guzel Deger et al., 2015). A role for GHR1 as an integral component required for stomatal function is now emerging, as we demonstrate here the requirement for GHR1 in the control of steady state stomatal conductance and stomatal closure induced by elevated CO2 levels, darkness, diurnal light/dark transitions, and the air pollutant O3, which mimics apoplastic ROS production by NADPH oxidases. Importantly, the total lack of response to CO2 and darkness observed in the ghr1 mutant, as opposed to the delayed response in ost1 (Figure 2), indicates that GHR1 has a relatively larger impact on these responses. Using in vivo gas exchange measurements of intact rosettes (Kollist et al., 2007), we recorded a total absence of responsiveness to diurnal light/dark transitions and to darkness applied during the light period in ghr1-3. These responses have previously been reported to be mostly functional in ghr1-1 (Hua et al., 2012). These diverse results could be due to differences in the experimental setups and methodology used for the measurements or to the different ghr1 alleles used.

Tycho Dive Deluxe Version 2012 Z

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