^<14>C-Behavior of ^<14>C-[U]-Sucrose, ^<14>C-[U]-Asparagine, and ^<14>C-[U]-Serine Introduced to the Flag Leaf of Rice and Sorghum Plants during Ripening
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概要
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^<14>C-[U]-sucrose, ^<14>C-[U]-asparagine, and ^<14>C-[U]-serine were introduced from the tip of the flag leaf at the mid-ripening stage of rice and sorghum plants, which were grown without nitrogen application after flowering, and the ^<14>C-behavior of the introduced ^<14>C-compounds was studied. The results obtained were as follows. 1) When ^<14>C-[U]-sucrose was introduced to the leaf, the amount of ^<14>CO_2 released by respiration form the leaf was larger under dark conditions than under light conditions in both crops. Since the amount of ^<14>CO_2 released by sorghum was smaller than that of rice under both light conditions, it was assumed that sorghum had reassimilated CO_2 which was once released in the plant tissues. 2) When ^<14>C-[U]-asparagine was introduced to the leaf, the amount of ^<14>CO_2 released by respiration from the leaf under light conditions was similar to that under dark conditions in rice, but it was larger under dark conditions in sorghum. Although a large amount of ^<14>C-asparagine was retained in sorghum, it was actively metabolized in rice. 3) When ^<14>C-[U]-serine was introduced, the amount of ^<14>CO_2 released by respiration was larger under dark conditions than under light conditions in sorghum. The ^<14>C of ^<14>C-serine in rice was actively respired and used for the synthesis of sugar, especially under light conditions. 4) The ^<14>C of each ^<14>C-compound introduced was translocated into other organs more rapidly in rice than in sorghum. From the above results, it is considered that the ^<14>-compounds introduced to the vascular bundles were basically metabolized in a different manner in rice and sorghum, including the difference in the ^<14>CO_2 reassimilation rate and ^<14>C translocation rate into other organs.
- 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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Shinano Takuro
Faculty Of Agriculture Hokkaido University
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Tadano Toshiaki
Faculty Of Agriculture Hokkaido University
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Matsumoto D
Shinshu Univ. Nagano Jpn
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Matsumoto Daisuke
Faculty of Agriculture, Hokkaido University
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