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Effects of Growth Temperature on the Thermal Stability of the Photosynthetic Apparatus of Atriplex lentiformis (Torr.) Wats.

Authors
  • Pearcy, R W1
  • 1 Department of Biological Sciences, State University of New York at Albany, Albany, New York 12222.
Type
Published Article
Journal
PLANT PHYSIOLOGY
Publisher
American Society of Plant Biologists
Publication Date
May 1977
Volume
59
Issue
5
Pages
873–878
Identifiers
PMID: 16659959
Source
Medline
License
Unknown

Abstract

High growth temperatures induced a substantial increase in the thermal stability of the photosynthetic apparatus of Atriplex lentiformis. This was manifested as a much reduced inhibition of light-saturated photosynthesis and the initial slope of the light-dependence curves by exposure to high temperatures in high as compared to moderate temperature-grown plants. Heat treatment at 46 C of leaves from moderate temperature-grown plants resulted in a marked reduction in photosystem II activities of chloroplasts isolated from them. In contrast, heat treatment of leaves from high temperature-grown plants resulted in no reduction of photosystem II activities. In vivo estimates of photosystem II functioning, the 515 nm light-induced absorbance change, and the ratio initial to maximum fluorescence (F(0)/F(max)) indicated a similar increase in the thermal stability of photosystem II in high temperature-grown plants.

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