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Plant and Cell Physiology, 1998, Vol. 39, No. 6 615-619
© 1998

Degradation of Endogenous Organic Acids Induced by Pi Uptake in Catharanthus roseus Cells: Involvement of the Biochemical pH-Stat

Katsuhiro Sakano, Seiichiro Kiyota and Yoshiaki Yazaki

National Institute of Agrobiological Resources 2-1-2 Kan-non-dai Tsukuba, Ibaraki, 305 Japan

We have previously shown that inorganic orthophosphate (Pi) uptake by Catharanthus roseus cells proceeds by a proton/Pi cotransport mechanism [Sakano (1990) Plant Physiol. 93: 479] that acidifies the cytoplasm [Sakano et al. (1992) Plant Physiol. 99: 672]. In the present study, we analyzed changes in the content of endogenous organic acids, carbon dioxide evolution, and oxygen consumption upon Pi application. The results are consistent with the operation of the biochemical pH-stat mechanism [Davies (1986) Physiol. Plant. 67: 702] during and after Pi uptake.

(Received November 13, 1997; Accepted March 30, 1998)
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