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Plant Physiology 64:25-30 (1979)
© 1979 American Society of Plant Biologists

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Articles

Photosynthetic Adaptation of Solanum dulcamara L. to Sun and Shade Environments

II. Physiological Characterization of Phenotypic Response to Environment 1

John M. Clough2, Randall S. Alberte and James A. Teeri

a Department of Biology, Barnes Laboratory, The University of Chicago, 5630 South Ingleside Avenue, Chicago, Illinois 60637

Photosynthetic and growth properties of Solanum dulcamara L. were studied under controlled environments. The 200 experimentally tested plants were clonal replicates of five field-collected individuals, three from fully exposed habitats and two from deeply shaded habitats. After 4 weeks of growth in one of eight environmental treatments, each plant was measured for leaf adaxial and abaxial conductance to water vapor, specific leaf weight, chlorophyll per square decimeter of leaf, photosynthetic unit size, light-saturated photosynthetic rate, total leaf area, and total leaf, stem, and root dry weights. Changes in light level influenced photosynthesis and growth of each plant more than changes in water availability or temperature. It is strongly suggested that the primary adaptive response of the tested individuals to changes in levels of light involves the regulation of leaf thickness.

2 Present address: Department of Botany, Duke University, Durham, North Carolina 27706.

1 This research was supported by The DeKalb Foundation, The Sprague Memorial Institute, The Louis Block Fund and The Hinds Fund of The University of Chicago, The Southeastern Plant Environment Laboratories (NSF DEB 76-04150), and NSF PCM 76-11142 to P. J. Kramer and a USDA-ARS Cooperative Agreement to R. S. A.






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Copyright © 1979 by the American Society of Plant Biologists