^<14>C-Allocation of ^<14>C-Compounds Introduced to a Leaf to Carbon and Nitrogen Components in Rice and Soybean during Ripening
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概要
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^<14>CO_2, ^<14>C-[U]-sucrose, and ^<14>C-[U]-asparagine were introduced to the flag leaf of rice or fully-expanded leaf of soybean. The ^<14>C-distribution to respired ^<14>CO_2 and each organ as well as to crude chemical components (sugars, amino acids, organic acids, protein, and the "others") was determined in the flag leaf of rice and fully-expanded leaf of soybean and the sink organ. The results obtained were as follows. 1. A large amount of ^<14>CO_2 was released rapidly from the leaf which assimilated ^<14>CO_2 in soybean both under dark and light conditions compared to rice. 2. A larger amount of ^<14>C in the flag leaf which assimilated ^<14>CO_2 was distributed to sugars after 24h in rice than in soybean, regardless of light conditions. However, a larger amount of ^<14>C was distributed to protein and organic acids in soybean. 3. The ^<14>CO_2 release rate from the leaf to which ^<14>C-sucrose and ^<14>C-asparagine had been introduced was similar in rice and soybean, regardless of nitrogen supply. The ^<14>CO_2 release rate form the sink organ was higher in soybean than in rice when sucrose was introduced, but similar in both crops when asparagine was introduced. The above results indicate that the current photosynthates during CO_2 assimilation were actively catabolized and respired in the source leaf of soybean compared to rice. As the utilization of ^<14>C-sucrose or ^<14>C-asparagine in the leaves did not differ significantly between rice and soybean, it is assumed that the use of these translocating compounds for respiration in the leaves was similar in rice and soybean. The low growth efficiency of soybean was partly due to the high respiratory loss of current photosynthates in leaves compared to rice, regardless of light or nitrogen conditions.
- 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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Tadano Toshiaki
Faculty Of Agriculture Hokkaido University
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Shlnano Takuro
Faculty of Agriculture, Hokkaido University
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Shlnano Takuro
Faculty Of Agriculture Hokkaido University
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