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PLANT PHYSIOLOGY , Vol 111, Issue 1 147-157, Copyright © 1996 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
Demand-Driven Control of Root ATP Sulfurylase Activity and SO42- Uptake in Intact Canola (The Role of Phloem-Translocated Glutathione)
A. G. Lappartient and B. Touraine
Biochimie et Physiologie Vegetales, Ecole Nationale Superieure d'Agronomie de Montpellier/Institut National de la Recherche Agronomique/Centre National de la Recherche Scientifique Unite de Recherche Associee 573, 34060 Montpellier Cedex 1, France
The activity of ATP sulfurylase extracted from roots of intact canola
(Brassica napus L. cv Drakkar) increased after withdrawal of the S source
from the nutrient solution and declined after refeeding SO42- to S-starved
plants. The rate of SO42- uptake by the roots was similarly influenced.
Identical responses were obtained in SO42- -fed roots when one-half of the
root system was starved for S. The internal levels of SO42- and glutathione
(GSH) declined after S starvation of the whole root system, but only GSH
concentration declined in +S roots of plants from split root experiments.
The concentration of GSH in phloem exudates decreased upon transfer of
plants to S-free solution. Supplying GSH or cysteine to roots, either
exogenously or internally via phloem sap, inhibited both ATP sulfurylase
activity and SO42- uptake. Buthionine sulfoximine, an inhibitor of GSH
synthesis, reversed the inhibitory effect of cysteine on ATP sulfurylase.
It is hypothesized that GSH is responsible for mediating the responses to S
availability. ATP sulfurylase activity and the SO42- uptake rate are
regulated by similar demand-driven processes that involve the translocation
of a phloem-transported message (possibly GSH) to the roots that provides
information concerning the nutritional status of the leaves.
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