Effect of Temperature, CO(2) Concentration, and Light Intensity on Oxygen Inhibition of Photosynthesis in Wheat Leaves.

Abstract:

:The effect of 21% O(2) and 3% O(2) on the CO(2) exchange of detached wheat leaves was measured in a closed system with an infrared carbon dioxide analyzer. Temperature was varied between 2 degrees and 43 degrees , CO(2) concentration between 0.000% and 0.050% and light intensity between 40 ft-c and 1000 ft-c. In most conditions, the apparent rate of photosynthesis was inhibited in 21% O(2) compared to 3% O(2). The degree of inhibition increased with increasing temperature and decreasing CO(2) concentration. Light intensity did not alter the effect of O(2) except at light intensities or CO(2) concentrations near the compensation point. At high CO(2) concentrations and low temperature, O(2) inhibition of apparent photosynthesis was absent. At 3% O(2), wheat resembled tropical grasses in possessing a high rate of photosynthesis, a temperature optimum for photosynthesis above 30 degrees , and a CO(2) compensation point of less than 0.0005% CO(2). The effect of O(2) on apparent photosynthesis could be ascribed to a combination of stimulation of CO(2) production during photosynthesis, and inhibition of photosynthesis itself.

journal_name

Plant Physiol

journal_title

Plant physiology

authors

Jolliffe PA,Tregunna EB

doi

10.1104/pp.43.6.902

subject

Has Abstract

pub_date

1968-06-01 00:00:00

pages

902-6

issue

6

eissn

0032-0889

issn

1532-2548

journal_volume

43

pub_type

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