Differences between Spinach and Kidney Bean Plants in Terms of Sensitivity to Fumigation with NO_2

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概要

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• Fumigation of plants of five species with NO_2 in darkness caused visible injuries to leaves, with the most severe injuries in kidney bean plants and the least severe in spinach plants. Fumigation of these plants in the light caused virtually no visible injuries. NO_2-fumigated leaves accumulated nitrite in the darkness but not in the light. The level of accumulated NO_2^- was decreased by light much more rapidly in spinach leaves than in those of kidney bean, with much less injury to spinach leaves than to those of kidney bean. A larger amount of NO_2^- accumulated in the trifoliate leaves of kidney bean plants cultivated with NO_3^- as a main source of nitrogen than in those of plants cultivated with NH_4^+, and the former plants were more susceptible to injury from NO_2 than the latter. Administration of NO_2^- to leaves of spinach and kidney bean plants induced the destruction of Chl in the light. The extent of the destruction of Chl was smaller in spinach than in kidney bean, consistent with their respective responses to NO_2. The NO_2^-induced destruction of Chl was inhibited to some extent by scavengers of free radicals. Activities of superoxide dismutase (SOD) were higher in leaves of spinach than in those of kidney bean. These results indicate that NO_2^- is the toxic species generated by fumigation with NO_2 and that spinach has a greater tolerance for NO_2 than kidney bean, probably as a result both of a higher capacity for reduction of NO_2^- and a higher level of activity ofSOD.

• 日本植物生理学会の論文

著者

• SHIMAZAKI Ken-ichiro

  Biological Laboratory, College of General Education, Kyushu University

• Yu Shu-wen

  Institute Of Plant Physiology Academia Sinica

• TANAKA Kiyoshi

  Division of Environmental Biology, National Institute for Environmental Studies

• SAKAKI Takeshi

  Division of Environmental Biology, the National Institute for Environmental Studies

• Sakaki Takeshi

  Division Of Environmental Biology The National Institute For Environmental Studies

• Shimazaki Ken-ichiro

  Biological Laboratory College Of General Education Kyushu University

• Tanaka Kiyoshi

  Division Of Environmental Biology National Institute For Environmental Studies

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