Repression of Proton extrusion from Intact Cucumber Roots and the Proton Transport Rate of Microsomal Membrane Vesicles of the Roots due to Ca^<2+> Starvation
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概要
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Proton extrusion from cucumber roots decreased markedly during Ca^<2+> starvation in the presence of KCl. Vesicles with ATP-dependent proton transport activity were prepared from the microsomal membrane fraction of control and Ca^<2+>-starved roots. The proton transport rate of the vesicles from Ca^<2+>-starved roots was repressed to less than half of the vesicles prepared from the control roots. K^+-Mg^<2+>-ATPase activity associated with the vesicles prepared from Ca^<2+>-starved roots was approximately one-third of the activity associated with those prepared from control roots. K_m values of the proton transport rate and K^+-Mg^<2+>-ATPase for ATP were much higher in vesicles prepared from Ca^<2+>-starved roots. The repression of proton extrusion linked with K^+ uptake in the Ca^<2+>-starved roots could be largely caused by the reduced proton pumping activity associated with microsomal membranes in the roots.
- 日本植物生理学会の論文
著者
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Matsumoto Hideaki
Institute For Agricultural And Biological Sciences Okayama Umverstty
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Matsumoto Hideaki
Institute For Agricultural And Biological Science Okayama University
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