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Plant and Cell Physiology, 1995, Vol. 36, No. 1 187-189
© 1995

Short Communication

The Role of Phosphoenolpyruvate in Proton/Pyruvate Cotransport into Mesophyll Chloroplasts of Maize

Naohiro Aoki and Ryuzi Kanai

Department of Biochemistry, Faculty of Science, Saitama University Urawa, 338 Japan

Phosphoenolpyruvate (PEP) was transported together with H+ in C4 mesophyll chloroplasts. Medium alkalization and stromal acidification due to pyruvate uptake into maize mesophyll chloroplasts in the light were partially inhibited by adding PEP. Thus, the H+ taken up by H+/pyruvate cotransport into mesophyll chloroplasts is released together with PEP in vivo.

(Received August 5, 1994; Accepted October 3, 1994)
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