Electrophysiological properties of Arabidopsis thaliana guard cells : responses to abscisic acid studied with abi-mutants

ln the outer cell layer of leaves stomates are located which form microscopic small pores in the leaf surface. These pores enable the exchange of gasses between plants and ambient air. In the light, carbon dioxide from the surrounding atmosphere enters the leaf where it is converted into sugars and other compounds. This process is called photosynthesis. During this process plants produce oxygen which is released through the same stomates. As a consequence of these open pores, water evaporates, which is often unfavourable for the plant. The degree of loss of water is regulated, within certain limits, by opening or closure of the stomates. So called stomatal movements cause the pore to widen or narrow. During drought, loss of water is prevented when stomates close, while opening of stomates occurs when there is a suflicient supply of water. ... Zie: Summary.