Journal
SCIENCE ADVANCES
Volume 7, Issue 28, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abg4619
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Funding
- German Science Foundation (DFG) [KO3657/2-3, RO2381/8-1, HE1640/42-1]
- King Saud University's International Cooperation and Scientific Twinning Department, Riyadh, Saudi Arabia [ICSTD-2020/2]
- China Scholarship Council (CSC) [201506350031, 201706170081]
- Prix-Louis-Jeantet 2013
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Activation of guard cell anion channels is sufficient to close stomata and limit plant water loss.
Guard cells control the aperture of plant stomata, which are crucial for global fluxes of CO2 and water. In turn, guard cell anion channels are seen as key players for stomatal closure, but is activation of these channels sufficient to limit plant water loss? To answer this open question, we used an optogenetic approach based on the light-gated anion channelrhodopsin 1 (GtACR1). In tobacco guard cells that express GtACR1, blue- and green-light pulses elicit Cl- and NO3- currents of -1 to -2 nA. The anion currents depolarize the plasma membrane by 60 to 80 mV, which causes opening of voltage-gated K+ channels and the extrusion of K+. As a result, continuous stimulation with green light leads to loss of guard cell turgor and closure of stomata at conditions that provoke stomatal opening in wild type. GtACR1 optogenetics thus provides unequivocal evidence that opening of anion channels is sufficient to close stomata.
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