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Photosynthetic and Respiratory Responses of Natural Populations of Koeleria cristata Grown in Three Environmental Regimes

Philip A. Robertson
Botanical Gazette
Vol. 137, No. 1 (Mar., 1976), pp. 94-98
Stable URL: http://www.jstor.org/stable/2473764
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Photosynthetic and Respiratory Responses of Natural Populations of Koeleria cristata Grown in Three Environmental Regimes
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Abstract

The photosynthetic and respiratory responses of plants from four natural populations of Koeleria cristata preconditioned in three environmental regimes were compared. Tetraploid plants had significantly higher photosynthesis activity than diploid plants, while no significant differences in dark respiration occurred between ploidy levels. Photosynthesis significantly increased, and respiration decreased, with increasing temperature of the preconditioning regime. A time-course study of two plant groups indicated that adjustments in photosynthetic activity were occurring up to 7 days after their environment was altered.

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