Changes in the Number and Size of Chloroplasts during Senescence of Primary Leaves of Wheat Grown under Different Conditions : ENVIRONMENTAL AND STRESS RESPONSES
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概要
- 論文の詳細を見る
Changes in the number and size of chloroplasts in mesophyll cells were investigated in primary leaves of wheat from full expansion to yellowing under different growth conditions. The number of chloroplasts per cell decreased slowly, although the decrease was steady and statistically significant, until the last stage of leaf senescence, when rapid degradation of chloroplasts took place. Rates of leaf senescence, or the decline in the number of chloroplasts, varied greatly among plants grown at different seasons of the year, but about 20% of chloroplasts always disappeared during the phase when steady loss of chloroplasts occurred. The area of chloroplast disks also de-creased gradually but significantly, with a rapid decrease late in senescence. Thus, the total quantity of chloroplasts per mesophyll cell decreased substantially during leaf senescence. Yellowed leaves contained numerous structures that resemble oil drops but no chloroplasts. Decreases in rates of photosynthesis that occur during senescence may, therefore, be largely due to decreases in the quantity of chloroplasts. However, a better correlation was found between the decrease in the maximum capacity for photosynthesis and the degradation of RuBP carboxylase. When plants had been grown with a sufficient supply of nutrients, the number of chloroplasts decreased steadily but at a reduced rate and the reduction in the area of chloroplast disks was strongly suppressed. Thus, the quantitative decrease in chloroplasts in senescing leaves appears to be regulated by the requirements for nutrients (nitrogen) of other part of the plant.
- 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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Ono K
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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Ono Kiyomi
Department of Plant Physiology,National Institute of Agrobiological Sciences
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Okabe Keiichiro
Institute Of Cell Engineering Dds R & D Center Advance Co. Ltd.
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Katoh Sakae
Department Of Biology Faculty Of Science Toho University
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Katoh Sakae
Department Of Biology Faculty Of Science University Of Tokyo:(present)department Of Biology Faculty
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Ono Kiyomi
Department Of Bio-medical Engineering Tokai University
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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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