CHANGE OF B-TYPE HAEM CONTENT IN RELATION TO PEROXIDASE BIOSYNTHESIS IN INJURED SWEET POTATO ROOTS
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概要
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The methods of quantitative analysis of b-type haem in plants were investigated. With an improved method developed was determined the haem content in the supernatant, mitochondrial, and microsomal fractions of sweet potato tissue. The activities of peroxidase, catalase, and cytochrome oxidase, as well as the contents of b-type haem and acid-insoluble nitrogen In the cellular fractions were determined at different incubation times after cutting of sweet potato tissue. Peroxidase and catalase increased with time in each cellular fraction, following a short lag phase. In the mitochondrial fraction, b-type haem, cytochrome oxidase, and acid insoluble nitrogen increased linearly with time. In the microsomal and supernatant fraction, b-type haem increased with time following a short lag phase. The increase in haem content of the supernatant fraction appeared to be associated with peroxidase formation. Time course analysis showed that ^<59>Fe-incorporation into b-type haem of the supernatant fraction increased with time and that incorporation was markedly inhibited by blasticidin S. The incorporation of ^<59>Fe into mitochondrial haem did not increase with time and was not inhibited by blasticidin S. Blasticidin S inhibited ^<59>Fe-incorporation into microsomal haem. Time course analysis of b-type haem content, ^<59>Fe-incorporation into b-type haem, and peroxidase activity suggest that in the injured tissue haem is synthesized from low molecular weight compounds and is incorporated into peroxidase as the haem moiety.
- 日本植物生理学会の論文
著者
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Asahi Tadashi
Laboratory of Biochemistry, School of Agriculture, Nagoya University
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Nakazawa Yuko
Laboratory Of Biochemistry Faculty Of Agriculture Nagoya University:(present)institute For Plant Vir
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Asahi Tadashi
Laboratory Of Biochemistry Faculty Of Agriculture Nagoya University
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URITANI IKUO
Laboratory of Biochemistry, Faculty of Agriculture, Nagoya University
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Uritani Ikuo
Laboratory Of Biochemistry Faculty Of Agriculture Nagoya University
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Asahi Tadashi
Laboralory Of Biochemistry Faculty Of Agriculture Nagoya University
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Asahi Tadashi
Laboratory of Biochemistry, Faculty of Agriculture, Nagoya University
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