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Science 18 February 1972:
Vol. 175. no. 4023, pp. 786 - 789
DOI: 10.1126/science.175.4023.786
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Articles

Photosynthetic Adaptation to High Temperatures: A Field Study in Death Valley, California

Ollw Björkman 1, Robert W. Pearcy 1, A. Tyrone Harrison 2, and Harold Mooney 2

1 Department of Plant Biology, Carnegie Institution of Washington, Stanford, California 94305
2 Department of Biological Sciences, Stanford University, Stanford 94305

The photosynthesis of Tidestromia oblongifolia (Amranthaceae) is remarkably well adapted to operate at the very high summer temperatures of the native habitat on the floor of Death Valley. The photosynthetic rate was very high and reached its daily maximum when the light intensity reached its noon maximum at the high leaf temperatures of 460° to 50°C which occurred at this time. At the intensity of noon sunlight the rate decreased markedly when the leaf temperature was experimentally reduced to below 44°C. The optimum rate occurred at 47°C. At this temperature the photosynthetic rate was essentially directly proportional to light intensity up to full sunlight.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Adaptation of Photosynthetic Processes to Stress.
J. A. Berry (1975)
Science 188, 644-650
   Abstract »    PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)