Palisade Tissue Chloroplasts and Spongy Tissue Chloroplasts in Spinach : Biochemical and Ultrastructural Differences
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概要
- 論文の詳細を見る
Palisade tissue chloroplasts (P-Chlts) and spongy tissue chloroplasts (S-Chlts) were separately isolated from spinach leaves, and their photosynthetic properties were compared. The following results were obtained: (1) At saturating light, the activities of overall electron transport and CO_2 fixation in P-Chlts were respectively 1.6-2.0 and 2.5-3.0 times higher than those in S-Chlts on a Chl basis. (2) The contents of PS I and PS II reaction centers (P700 and 47 kDa polypeptide, respectively) were slightly higher in P-Chlts than in S-Chlts, while the contents of plastoquinone, Cyt f, plastocyanin, ferredoxin, ferredoxin-NADP^+ reductase, coupling factor and ribulose-bisphosphate carboxylase were 1.6-2.2 times higher in P-Chlts than in S-Chlts on a Chl basis. (3) Electron microscopic examination of chloroplast ultrastructure showed that S-Chlts have highly stacked grana accompanied by higher proportion of appressed thylakoids relative to non-appressed thylakoids, while P-Chlts have poorly stacked grana. The volume ratio of thylakoids to stroma was higher in S-Chlts than in P-Chlts. These results indicate that mesophyll chloroplasts adapt to the light environment within a leaf in a similar way that the sun and shade plant chloroplasts adapt to the light environment within a canopy.
- 日本植物生理学会の論文
著者
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Terashima I
Osaka Univ. Toyonaka Jpn
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Terashima Ichiro
Laboratory Of Ecology Department Of Botany Faculty Of Science University Of Tokyo:(present)departmen
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Inoue Yorinao
Solar Energy Research Group Riken
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Inoue Yorinao
Solar Ener.res.group Riken
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