Effects of Growth Substances on Photosynthesis

Some effects of 2,4-dichlorophenoxyacetic acid on the carbohydrate methobolism of etiolated corn seedlings / by Clanton Candler Black.

“…In experiments on the effect of 2,4-D on photosynthesis, similar types of results have been reported (36,41,47,100,114). Therefore, although the information from gas exchange studies has been useful in delineating areas for further study, it has not provided the answer to the mechanism of action of 2,4-D.…”

Effects of light on plants : a literature review, 1950

“…While there is general agreement that chlorophyll plays an indispensable role in photosynthesis there is no experimental evidence to indicate that the carotenoid pigments function in the process, even though they invariably accompany chlorophyll in the chloroplasts . In studies with indoleacetic acid and several other growth substances, Freeland (49) observed that most of these depressed the rate of apparent photosynthesis in bean plants.…”

Studies in Plant Metabolism. IV. Comparative Effects of 2,4-Dichlorophenoxyacetic Acid and Other Plant Growth Regulators on Phosphorus Metabolism in Bean Plants.

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Accumulated evidence has indicated that the physiological effect of 2,4-dichlorophenoxyacetic acid (2,4-D) in plants may function through its effect on processes of respiration (1,2,3,4,5) as well as on photosynthesis (6). Since the precise mechanism by which plant cells respond to 2,4-D has yet to be elucidated, and the participation of phosphorus in biological oxidation-reduction reactions had been found in both higher animals and microorganisms, an investigation was initiated to study the comparative effects of 2,4-D and other plant growth regulators on phosphorus metabolism in order to clarify, in part, the herbicidal effect of 2,4-D.

The immediate objectives of the work reported here are as follows: the comparative effects of 2,4-D and other plant growth regulators on (1) the phosphorus uptake, (2)

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