Abstract
Abstract Stomatal guard cells delimit pores in the epidermis of plant leaves and modulate plant gas exchange through the regulation of aperture of the pore. The opening and closure of stomatal pores control the trade-off between efficient photosynthetic CO2 fixation and water loss via transpiration, playing a critical role in plant growth and stress responses. Stomata open in response to light and close in response to drought stress, elevated CO2, ozone, low humidity and plant pathogens. Stomatal movement relies on transport of solutes across channels and transporters in the plasma membrane and vacuolar membrane of guard cells. The fine-tuned regulation of this transport requires an integrated convergence of multiple endogenous signals and environmental stimuli. Current knowledge of the plasma membrane and vacuolar membrane ion channels and transporters of guard cell model systems and their function in guard cell signalling is reviewed in this chapter.
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