Journal Article

Degradation of Endogenous Organic Acids Induced by P<sub>i</sub> Uptake in <i>Catharanthus roseus</i> Cells: Involvement of the Biochemical pH-Stat

Katsuhiro Sakano, Seiichiro Kiyota and Yoshiaki Yazaki

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 39, issue 6, pages 615-619
Published in print June 1998 | ISSN: 0032-0781
Published online June 1998 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029412
Degradation of Endogenous Organic Acids Induced by Pi Uptake in Catharanthus roseus Cells: Involvement of the Biochemical pH-Stat

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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.

Keywords: Alternative pathway respiration; Biochemical pH-stat; Cotransport; Pi transport; Organic acid metabolism; Respiration

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Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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