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Plant Physiology 63:1033-1038 (1979)
© 1979 American Society of Plant Biologists

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Articles

Time Course of Photosynthetic Response to Changes in Incident Light Energy 1

Louis J. Gross and Brian F. Chabot

a Section of Ecology and Systematics, Langmuir Laboratory, Cornell University, Ithaca, New York 14850

The response of whole leaf photosynthetic rate in Fragaria virginiana to sudden changes in photosynthetically active radiation (PAR) is described. Two components of the response, consisting of a time lag and time constant, are estimated under varying PAR changes for plants grown under two different light regimes. Both the time lag and time constant are found to vary with PAR but not with growth light regime. A model of Thornley for leaf photosynthetic response is refuted and an alternative form is discussed.

1 This work was supported by grants from the McIntire-Stennis Program (NYC 183553) and the National Science Foundation (MCS 77-01076 and DEB 77-08432).






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1979 by the American Society of Plant Biologists