Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 70:949-952 (1982)
© 1982 American Society of Plant Biologists

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pH Dependence and Kinetics of Glycolate Uptake by Intact Pea Chloroplasts 1

Konrad T. Howitz2 and Richard E. McCarty

Section of Biochemistry, Molecular and Cell Biology, Division of Biological Sciences, Cornell University, Ithaca, New York 14853

Experiments in which [1-14C]glycolate uptake is carried out in conjunction with measurements of stromal pH indicate that only glycolic acid and not the glycolate anion is crossing the pea (Pisum sativum var. Progress No. 9, Agway) chloroplast envelope. This mechanism of glycolate transport appears to be too slow to account for observed photorespiratory carbon fluxes in C3 plants.

2 Recipient of a National Science Foundation Graduate Fellowship.

1 Supported by Grant 5901-0410-8-0136-0 from the Competitive Grants Program of the Science and Education Administration of the United States Department of Agriculture.






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