D. W. SHERIFF*, Department of Environmental Biology, Research School of Biological Sciences, The Australian National University, Canberra City, ACT, 2601, Australia Received 5 September 1978 Introduction That stomata respond to environmental stimuli by opening and closing is well established. These responses appear to be of advantage to a plant in the way they affect water use and photosynthesis, for example by maximising photosynthesis while minimising water loss or by providing increased evaporative cooling at high temperatures. For such responses to occur, the environment must be 'sensed' so that the osmotic potentials of the guard, and possibly the subsidiary cells, will change, resulting in changes in the turgor pressure of these cells and causing the stomatal aperture to change (Edwards, Meidner & Sheriff, 1976; Meidner & Mansfield, 1968). In this short review, the role of the guard cells in sensing various aspects of the environment will be discussed. Responses of guard cells to the environment are difficult to measure directly, and this can only be done by using sophisticated equipment in carefully controlled laboratory experiments. The responses by guard cells to external factors have therefore generally been interpreted from measured changes in stomatal aperture (which the guard cells largely
Plant Cell & Environment – Wiley
Published: Mar 1, 1979
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