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Biochim Biophys Acta. 1992 Apr 13;1105(2):230-6.

Sulfur dioxide inhibits the sucrose carrier of the plant plasma membrane.

Author information

1
UA CNRS 574, Laboratoire de Biologie et Physiologie Végétales, Université de Poitiers, France.

Abstract

Plasma membrane vesicles were prepared by phase partition from a microsomal fraction of broad bean (Vicia faba L.) leaf. In order to study the effects of sodium sulfite on active uptake of sucrose, the vesicles were artificially energized by a transmembrane pH gradient (delta pH) and/or a transmembrane electrical gradient (delta psi). At 1 mM, sulfite strongly inhibited sucrose uptake but did not affect the two components of the proton motive force, delta pH (measured by dimethyloxazolidine dione) and delta psi (measured by tetraphenylphosphonium). Moreover, sulfite did not inhibit the proton-pumping ATPase of the plasma membrane vesicles. These data demonstrate that sulfite may inhibit transport of photoassimilates in plant by a direct inhibition of the sucrose carrier of the plasma membrane.

PMID:
1534025
DOI:
10.1016/0005-2736(92)90199-v
[Indexed for MEDLINE]

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