Calculations indicate slightly more than one-half ofthedecrease in photosynthesis in air is due to photorespiration and the remainder to oxygen inhibition ofphotosynthesis.
“slightly more than onehalf ofthedecrease in photosynthesis in air is due to photorespiration, and that the remainder is due to an oxygen inhibition ofphotosynthesis”
“Changes in the pattern ofphotosynthesis on clear days, especially the midday decrease, are apparently primarily controlled by changes in leaf water potential.”
“In leaves of dicotyledonous plants studied thedecrease in apparent photosynthesis between 20 to 30 degrees at 21% O(2) was shown to be due primarily to an increase in CO(2) evolution in light with relatively little effect on photosynthesis”
when the leaves were fully expanded and continued to decrease during senescencee4
Verbatim
e4
“The rates ofphotosynthesisof untreated apple leaves reached a maximum of 14.95 mg. CO 2 /dm. 2 × hr. when the leaves were 92 per cent of full leaf expansion but had decreased when the leaves were fully expanded and continued to decrease during senescence”
Partial reduction of cotyledon photosynthesis caused a proportional decrease in primary needle expansion and in dry weight increment of red pine seedlings.
“The role of photosynthetically active cotyledons on development of young red pine (pinus resinosa Ait.) seedlings”
e2
“Partial reduction ofphotosynthesis by herbicides, low light intensity, or both ofthese was followed by proportional decrease in expansion of primary needles and reduction in dry weight increment of seedlings”
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Glycine maxt0
Pinus resinosa