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Plant Physiology 62:387-390 (1978)
© 1978 American Society of Plant Biologists

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Stomatal Response to Light of Solanum pennellii, Lycopersicon esculentum, and a Graft-induced Chimera 1

Gary H. Heichel2 and Sandra L. Anagnostakis

Department of Ecology and Climatology, and Department of Genetics, The Connecticut Agricultural Experiment Station, P.O. Box 1106, New Haven, Connecticut 06504

To learn how species differences in stomatal behavior are regulated, the response of epidermal and leaf diffusive resistance to light was investigated in Lycopersicon esculentum Mill., Solanum pennellii Corr., and a periclinal chimera having an S. pennellii epidermis and an L. esculentum mesophyll that was produced from a graft of the two species. S. pennellii has about 23% fewer stomata per square millimeter than does L. esculentum, and the two species have contrasting stomatal sensitivities to light. The abaxial stomata of L. esculentum open in dimmer light and to a greater extent than the adaxial stomata. The abaxial and adaxial stomata of S. pennellii respond similarly to light incident on the adaxial epidermis and are less open at all quantum flux densities than comparable stomata of L. esculentum. The patterns of response to light of the abaxial and adaxial stomata of the chimera were practically identical to those of L. esculentum, and quite unlike those of S. pennellii. Thus, the pattern of stomatal light response in the chimera was regulated by the L. esculentum mesophyll. The reduction in stomatal frequency of the chimera, which was regulated by the epidermis of S. pennellii, contributed to the 40% difference in leaf diffusive resistance between the plants in moderate light.

2 Present address: Science and Education Administration/Federal Research, USDA, and the Department of Agronomy and Plant Genetics, 1509 Gortner Avenue, University of Minnesota, St. Paul, Minnesota 55108.

1 Contribution from the Connecticut Agricultural Experiment Station, New Haven.




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R. S. Poethig
Phase Change and the Regulation of Shoot Morphogenesis in Plants
Science, November 16, 1990; 250(4983): 923 - 930.
[Abstract] [PDF]


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Copyright © 1978 by the American Society of Plant Biologists