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Wenn der Mensch ein Loch sieht, hat er das Bestreben, es auszuftillen, dabei fallt er meist hinein. Kurt Tucholsky STOMATAL FUNCTION (THE CONTROL TASK) Most of the basic mechanisms involved in stomatal action are not yet understood. We do not know how plant cells take up ions, how ions are moved between cell compartments, how carbohydrate metabolism is coupled to ion transport, how a loss of water from leaves triggers the synthesis of abscisic acid, how abscisic acid affects ion transport, and so on. Insufficient tools are available to study quantitatively the metabolism of the guard cells. The volume of guard cells constitutes only one thirtieth or less of the total volume of the epidermis. The lumen of a pair of guard cells, if it is large, has a volume of about 10-11 liter. We have been unable so far to separate guard cells in quantities sufficient for biochemical analysis from the tissue in which they are embedded. Yet we try to understand and describe stomatal action because we are fascinated by the ability of the stomata to respond to changes in the environment within minutes, even seconds, and we realize, of course, that virtually all of the
Annual Review of Plant Biology – Annual Reviews
Published: Jun 1, 1975
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