Involvement of Oxidation, Proteolysis and Reductant Availability in the Regulation of in vivo Nitrate Reductase in Attached Oat Leaves during Growth and Senescence

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概要

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• Changes in nitrate reductase (NR) activity during growth and senescence of attached oat leaves were studied, in order to understand the influence of certain regulatory mechanisms on the in vivo activity at each stage of foliar development. The enzyme activity was greatest in 7-day-old leaves. It decreased in young, still-growing 11-day-old leaves, was stable with the 15th day, and decreased again at the onset of leaf senescence. The first decrease in NR activity coincided with the beginning of leaf unfolding and with the increase in endogenous oxidations, and also with the maximal activity of neutral proteases. This decrease was prevented when plants had been exposed to low O_2 pressure. High O_2 pressure impaired the NR activity increase occurred from 5 to 7 days in the control (21% O_2). Cysteine improved NR activity at each stage of leaf development. The second decrease in NR (during senescence) did not occur when NADH was supplied to the assay medium (in vitro test). These results suggest that during growth, NR activity is regulated by oxidation of SH groups and by the activity of neutral proteases. During senescence, reductant availability may also contribute to the regulation of NR.

• 日本植物生理学会の論文

著者

• Trippi V.

  Laboratorio De Fisiologia Vegetal Facultad De Ciencias Exactas Fisicas Y Naturales Universidad Nacio

• Trippi V.

  Laboratorio De Fisiologia Vegetal Imviv. Facultad De C. E. F. Y Naturales Universidad Nacional De Co

• Kenis J.

  Laboratorio de Fisiologia Vegetal, IMVIV. Facultad de C. E. F. y Naturales, Universidad Nacional de

• Kenis J

  Univ. Nacional De Co′rdoba Co′rdoba Arg

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• Involvement of Oxidation, Proteolysis and Reductant Availability in the Regulation of in vivo Nitrate Reductase in Attached Oat Leaves during Growth and Senescence

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