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The Effect of Light Intensity during Growth on the Subsequent Rate of Photosynthesis of Leaves of Tall Fescue (Festuca arundinacea Schreb.)

JANE WOLEDGE
Annals of Botany
New Series, Vol. 35, No. 140 (March 1971), pp. 311-322
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/42908344
Page Count: 12
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The Effect of Light Intensity during Growth on the Subsequent Rate of Photosynthesis of Leaves of Tall Fescue (Festuca arundinacea Schreb.)
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Abstract

Leaves of tall fescue (Festuca arundinacea Schreb.) plants grown in bright light had higher rates of apparent photosynthesis per unit leaf area in bright light, and slightly lower rates in dim light than did those of plants grown in dim light. Dark respiration rates were higher in plants grown in bright light than in plants grown in dim light and the decline of photosynthesis with increasing leaf age was faster. The rate of apparent photosynthesis in bright light of the first leaf to become fully expanded after plants were transferred from bright to dim light was lower than that of plants remaining in bright light. The decline in the rate of photosynthesis of a leaf already fully expanded at the time of transfer was not affected. Transferring from dim to bright light increased the rate of photosynthesis of the next expanded leaf; it also increased the rate of an already fully expanded leaf during the first week in bright light. After this, photosynthesis fell at a rate similar to that of plants remaining in dim light.

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