Differences between Spinach and Kidney Bean Plants in Terms of Sensitivity to Fumigation with NO2 |
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Authors: | Shimazaki, Ken-ichiro Yu, Shu-Wen Sakaki, Takeshi Tanaka, Kiyoshi |
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Affiliation: | 1Biological Laboratory, College of General Education, Kyushu University Ropponmatsu, Fukuoka, 810 Japan 2Institute of Plant Physiology, Academia Sinica 300 Fonglin Road, Shanghai, People's Republic China 200032 3Division of Environmental Biology, The National Institute for Environmental Studies Tsukuba, Ibaraki, 305 Japan |
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Abstract: | Fumigation of plants of five species with NO2 in darkness causedvisible injuries to leaves, with the most severe injuries inkidney bean plants and the least severe in spinach plants. Fumigationof these plants in the light caused virtually no visible injuries.NO2-fumigated leaves accumulated nitrite in the darkness butnot in the light. The level of accumulated NO2 was decreasedby light much more rapidly in spinach leaves than in those ofkidney bean, with much less injury to spinach leaves than tothose of kidney bean. A larger amount of NO2 accumulatedin the trifoliate leaves of kidney bean plants cultivated withNO3 as a main source of nitrogen than in those of plantscultivated with NH4+, and the former plants were more susceptibleto injury from NO2 than the latter. Administration of NO2to leaves of spinach and kidney bean plants induced the destructionof Chi in the light. The extent of the destruction of Chi wassmaller in spinach than in kidney bean, consistent with theirrespective responses to NO2. The NO2-induced destructionof Chi was inhibited to some extent by scavengers of free radicals.Activities of superoxide dismutase (SOD) were higher in leavesof spinach than in those of kidney bean. These results indicatethat NO2 is the toxic species generated by fumigationwith NO2 and that spinach has a greater tolerance for NO2 thankidney bean, probably as a result both of a higher capacityfor reduction of NO2 and a higher level of activity ofSOD. (Received June 5, 1991; Accepted January 27, 1992) |
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