Plant Physiol. Drug Metab Dispos
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Plant Physiology 67:193-196 (1981)
© 1981 American Society of Plant Biologists

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Articles

High-temperature Disruption of Guard Cells of Vicia faba

EFFECT ON STOMATAL APERTURE 1

Cynthia Rogers2, Peter J. H. Sharpe3, Robert D. Powell4 and Richard D. Spence2,3

2 Department of Biology, Houston Baptist University, Houston, Texas 77074, 3 Biosystems Research Division, Bioengineering Program, Texas A&M University, College Station, Texas 77843, 4 Department of Plant Sciences, Texas Agricultural Experiment Station, Texas A&M University, College Station, Texas 77843

Increased variability in stomatal aperture at high temperatures can be attributed, in part, to the differential sensitivity of guard cells to thermal damage. Individual stomata become increasingly open at higher temperatures until guard cells are lethally damaged; at that temperature, apertures decrease. The extent of irreversible damage causing closure was estimated by K+ uptake, neutral red accumulation, and visual scoring of chloroplasts.

This study found that visual scoring of chloroplast disruption provided the best estimate of guard cell viability at high temperature. Removal of the damaged guard cells from the population sample resulted in a constant coefficient of variability for apertures over the temperature range 25 to 50 C.

1 This work was supported by Grant DEB 77/14408 from the Division of Environmental Biology of the National Science Foundation to the Biosystems Research Division, Department of Industrial Engineering, and by the Texas Agricultural Experiment Station, Texas A&M University.






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Copyright © 1981 by the American Society of Plant Biologists