Effect of Mutual Shading on Carbon Distribution in Rice Plant
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概要
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The ^<14>C distribution among organs of rice plant at the ripening stage was determined under different levels of light intensity and mutual shading. The results obtained were as follows. 1) By shading(63%), dry matter accumulation was remarkably affected, whereas the ^<14>C distribution ratio to shoot, roots, ears, and for respiration was affected slightly by the shading treatment after ^<14>CO_2 feeding, but not by the shading treatment before ^<14>CO_2 feeding. By prolonged mutual shading in the artificial canopy, dry matter accumulation decreased, but the ^<14>C distribution ratio to each organ and for respiration was affected slightly regardless of growth stages since plants had became adapted to mutual shading for a long period of time. These results indicate that the ^<14>C distribution pattern was basically unaffected by the Iight intentsity. 2) When ^<14>CO_2 was assimilated in a fully expanded leaf of a tropical rice cultivar Peta under the condition that leaves at a lower position below the fully expanded leaf were completely shaded by aluminum foil, ^<14>C compounds from the fully expanded leaf translocated slowly into other organs, but a large amount of ^<14>C compounds from the fully expanded leaf was lost by respiration. When ^<14>CO_2 was assimilated to the flag leaf of temperate rice plants at the late maturation stage, and the side of the plant was shaded at 50% with a cloth, a loarge amount of ^<14>C compounds was consumed by respiration in the ^<14>C-fed leaf, but the ^<14>C compounds were not translocated from the upper leaf to the lower leaves. Thus, it is considered that the lower leaves did not consume the carbohydrates which were assimilated in upper leaves regardless of growth conditions, and that the respiratory activity of the fully light-exposed upper leaf increased due to the imbalance of source ability. 3) By mutual shading, the photosynthetic activity of the lower leaf decreased, and the distribution ratio of the ^<14>C compounds from leaves in the upper position to organs in a lower position also decreased. Therefore, it was assumed that the root activitiy decreased by mutual shading, which may account for the retardation of plant growth.
- 社団法人日本土壌肥料学会の論文
著者
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Osaki Mitsuru
Faculty of Agriculture, Hokkaido University
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Tadano Toshiaki
Faculty of Agriculture, Hokkaido University
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Osaki Mitsuru
Faculty Of Agriculture Hokkaido University
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Yamada Satoshi
Institute For Experimental Animals Kobe University School Of Medicine
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Yamada Satoshi
Laboratory Of Plant Nutrition Faculty Of Agriculture Hokkaido University
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Yamada Satoshi
Faculty Of Agriculture Tottori University
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Tadano Toshiaki
Faculty Of Agriculture Hokkaido University
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Iyoda Makoto
Faculty Of Agriculture Hokkaido University
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Yamada S
Fac. Agr. Tottori Univ.
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