Iron Deficiency Induced Changes in Ascorbate Content and Enzyme Activities Related to Ascorbate Metabolism in Cucumber Roots

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概要

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• Ascorbate content and the activities of ascorbate free-radical reductase (AFR-R) and ascorbate peroxidase (APX) were investigated in order to determine whether they are affected under Fe deficiency. Plasma membrane vesicles, cell wall and cytosolic fractions were isolated from the roots of cucumber (Cucumis sativus L.) plants grown in the absence or in the presence of Fe. Plasma membrane vesicles showed NADH-dependent reducing activities with Fe^<3+>-citrate, ferricyanide and AFR as electron acceptors. Only AFR-R activity was stimulated ca.3-fold in Fe deficient plasma membranes. No significant change in cytosolic AFR-R activity was induced by Fe depletion, while the activity of cytosolic APX was more than twice that of the non-deficient control. Furthermore, the content of ascorbate (AA) was enhanced ca.1.7-fold in Fe deficient roots. These results indicate that metabolic changes resulting in enhanced AA levels and activities of AFR-R and APX in the roots could be related to plant responses to Fe deficiency stress.

• 日本植物生理学会の論文

著者

• Yamashita Kousei

  Research Institute for Bioresources, Okayama University

• Yamashita Kousei

  Research Institute For Bioresources Okayama University

• Zaharieva Tatiana

  N.Poushkarov Institute of Soil Science and Agroecology

関連論文

• Stimulation of H^+ Extrusion and Plasma Membrane H^+-ATPase Activity of Barley Roots by Ammonium-Treatment
• Characterization of an Anion Transporter in the Plasma Membrane of Barley Roots
• Iron Deficiency Induced Changes in Ascorbate Content and Enzyme Activities Related to Ascorbate Metabolism in Cucumber Roots
• Salt Stress-Induced Enhancement of Anion Efflux and Anion Transport Activity in Plasma Membrane of Barley Roots
• Stimulation of Plasma Membrane H^+-Transport Activity in Barley Roots by Salt Stress

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