Changes in Protein Content and in the Structure and Number of Chloroplasts during Leaf Senescence in Rice Seedlings
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概要
- 論文の詳細を見る
Two types of experiment were carried out to examine whether or not the inactivation of photosynthesis is related to loss of chloroplasts during foliar senescence of rice seedlings. Levels of both soluble and insoluble leaf proteins decreased during senescence, the loss of the soluble proteins being faster than that of the insoluble ones. There was a good positive correlation between the rate of oxygen evolution and the level of soluble proteins. The inactivation of photosynthesis was also linearly related to the loss of a major fraction of insoluble proteins. Thus, the loss of photosynthetic ability is ascribable to the degradation of relevant proteins and enzymes during leaf senescence. Electron microscopy revealed that senescence caused the disorientation of the grana and stroma thylakoids, a decrease in the number of starch granules, and an increase in the size and number of plastoglobuli. Large grana consisting 20 to 30 thylakoids appeared in aged leaves. In addition to these changes in ultrastructure, there was a significant decrease in the size of chloroplasts. Furthermore, the number of chloroplasts in mesophyll cells was also notably reduced during senescence. Thus, the loss of leaf proteins and inactivation of photosynthesis are both related to the decrease in the total mass of chloroplasts during senescence of rice seedlings.
- 日本植物生理学会の論文
著者
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Katoh Sakae
Department of Pure and Applied Sciences. College of General Education. University of Tokyo
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Katoh S
Himeji Inst. Technol. Hyogo Jpn
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Satoh K
Okayama Univ. Okayama Jpn
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Kura-Hotta Mariko
Department of Biology, Faculty of Sciences, University of Tokyo
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Hashimoto Haruki
Department of Biology, College of Arts and Sciences, University of Tokyo
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Satoh Kimiyuki
Division Of Biological Regulation And Photobiology National Institute For Basic Biology:department O
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Satoh Kimiyuki
Natl. Inst. Basic Biol. Okazaki Japan
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Satoh K
Himeji Inst. Technol. Hyogo Jpn
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Katoh Sakae
Department Of Biology Faculty Of Science Toho University
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Kura‐hotta M
Department Of Biology Faculty Of Sciences University Of Tokyo
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Kura-hotta Mariko
Department Of Biology Faculty Of Science Science University Of Tokyo
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Hashimoto H
Univ. Tokyo Tokyo Jpn
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Hashimoto Haruki
Department Of Biology College Of Arts And Sciences University Of Tokyo
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Katoh Sakae
Department Of Biochemistry Faculty Of Science University Of Tokyo
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