Paraquat Sensitivity of Transgenic Nicotiana tabacum Plants That Overproduce a Cytosolic Ascorbate Peroxidase.
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The cDNA encoding the Arabidopsis cytosolic ascorbate Peroxidase was placed under the control of the promoter for ribulose-1, 5-bisphosphate carboxylase small subunit gene, and the chimeric gene was then introduced into tobacco. Leaves of the transgenic plants exhibited up to 5 to 10 fold higher ascorbate peroxidase activity than control non-transgenic plants. However, the paraquat sensitivity of these transgenic plants did not differ significantly from that of control plants as evaluated by electrolyte leakage from leaf discs. The ascorbate content and the ascorbate peroxidase activity rapidly decreased in leaf discs of both transgenic and control plants during paraquat treatment in the light. The cytosolic activity of ascorbate peroxidase appears therefore, at least under the present study conditions, not to be a limiting factor in the tolerance of plants to paraquat-induced oxidative stress.
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社団法人 環境科学会 | 論文
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