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

• Published in: Plant physiology (Bethesda) Vol. 86; no. 1; pp. 152 - 154
• Main Authors: Peeler, Thomas C., Naylor, Aubrey W.
• Format: Journal Article
• Language: English
• Published: 01.01.1988
• Subjects: Environmental and Stress Physiology
• ISSN: 0032-0889; 1532-2548

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 ( F v ), 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 F v than dark adaptation at 5°C following illumination. However, F v reappearance during the dark adaptation period in chilling-resistant pea was temperature independent. The difference in the temperature response of F v following illumination correlated with temperature sensitivity of these two species. The process responsible for the difference in F v may represent a site of chilling sensitivity in the photosynthetic apparatus.