Relationship between Photosynthesis and Chlorophyll Content during Leaf Senescence of Rice Seedlings
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概要
- 論文の詳細を見る
Photosynthetic oxygen evolution, chlorophyll contents and chlorophyll a/b ratios of 3rd to 6th leaves of rice seedlings were measured to examine whether or not inactivation of photosynthesis during senescence is related to loss of chlorophyll. Photosynthetic activity decreased more rapidly than chlorophyll content during leaf senescence; as a result, the lower the leaf position, the lower was the rate of oxygen evolution determined on the basis of chlorophyll. Chlorophyll a/b ratio also decreased with advancing senescence. Electrophoretic analysis revealed that the decline in chlorophyll a/b ratio is due to more rapid degradation of the reaction center complexes than light-harvesting chlorophyll a/b proteins of photosystem II and that the photosystem I reaction center disappears in parallel with the inactivation of photosynthesis. A simple method was developed to estimate the amounts of chlorophyll a associated with the reaction center complexes of the two photosystems from the total chlorophyll contents and chlorophyll a/b ratios of leaves. Rates of oxygen evolution, determined on the basis of chlorophyll a bound to the reaction center complexes, remained constant throughout the course of senescence. Thus, inactivation of photosynthesis is closely related with loss of the reaction center complexes during leaf senescence of rice seedlings. The results suggest that loss of photosynthesis is mainly caused by loss of a functional unit of photosynthesis or by a decrease in the number of whole chloroplasts.
- 日本植物生理学会の論文
著者
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Satoh Kazuhiko
Department of Life Science, University of Hyogo, 3-2-1 Kohto, Kamigohri, Ako-gun, Hyogo 678-1297, Ja
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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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Satoh Kazuhiko
Department Of Biology Faculty Of Science Toho University
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Kura-Hotta Mariko
Department of Biology, Faculty of 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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Katoh Sakae
Department Of Biochemistry Faculty Of Science University Of Tokyo
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