Our objective is to examine the integration of stomatal functioning with leaf metabolism and leaf environment and to indicate how this integration helps optimize the use of water and the use of the machinery for photosynthesis, while only marginally limiting the photosynthetic process. Reviewing the literature we find that the three following statements are often taken as axiomatic: 1 . Stomata impose a large limitation on the rate of CO2 assimilation. 2. The stomatal limitation is more severe when a plant is stressed than when it is not. 3. Stomata limit CO2 assimilation of C4 species more than that of C3 species. We find little experimental support for these ideas. We discuss how known mechanisms of stomatal response contribute to the integrated functioning outlined in the first sentence. This section is necessarily brief, and for more thorough treatments of such topics as ionic relations, biochemistry, and elastic properties of guard cells, the interested reader is referred to other reviews (40, 84). HOW STOMATA AFFECT PHOTOSYNTHESIS Introduction Stomatal movements provide the leaf with the opportunity to change both the partial pressure of CO2 at the sites of carboxylation [carboxylase p(C02)] and the rate of transpiration. In tum, changes in
Annual Review of Plant Biology – Annual Reviews
Published: Jun 1, 1982
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