Plant Physiol. Drug Metab Dispos
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Plant Physiology 86:152-154 (1988)
© 1988 American Society of Plant Biologists

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Environmental and Stress Physiology

The Influence of Dark Adaptation Temperature on the Reappearance of Variable Fluorescence following Illumination 1

Thomas C. Peeler2 and Aubrey W. Naylor

Department of Botany, Duke University, Durham, North Carolina 27706

The effect of chilling temperatures (5°C) on chlorophyll fluorescence transients was used to study chilling-induced inhibition of photosynthesis in plant species with differing chilling sensitivities. A Brancker SF-20 fluorometer was used to measure induced fluorescence transients from both attached and detached leaves of chilling-sensitive cucumber (Cucumis sativus L. cv Ashley) and chilling-resistant pea (Pisum sativum L. cv Alaska). The rate of reappearance of the variable component of fluorescence (Fv), following a period of illumination at 25°C, was dependent on the temperature at which the leaf was allowed to dark adapt in chilling-sensitive cucumber, but not in chilling-resistant pea. In cucumber, dark adaptation at 25°C following illumination resulted in a much faster return of Fv than dark adaptation at 5°C following illumination. However, Fv reappearance during the dark adaptation period in chilling-resistant pea was temperature independent. The difference in the temperature response of Fv following illumination correlated with temperature sensitivity of these two species. The process responsible for the difference in Fv may represent a site of chilling sensitivity in the photosynthetic apparatus.

2 Current address: Department of Botany, University of Texas, Austin, TX 78713.

1 Supported by National Science Foundation grants PCM-8404911 to A. W. N. and BSR 83-14925 to the Duke University Phytotron.






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