Carbon Skeletons for Amide Synthesis during Ammonium Nutrition in Tomato and Wheat Roots(Plant Nutrition)
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概要
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Heavy application of ammonium nitrogen to plant roots results in the conversion of ammonium nitrogen to the nitrogen of amides, glutamine, and asparagine, which are stored in roots or translocated to shoot. Since the net synthesis of such amides requires the supply of corresponding carbon skeletons, the carbon metabolism in amide synthesis in response to ammonium supply was investigated in tomato and wheat roots. The content of major primary amino acids was determined in tomato and wheat roots during a 4-d period of ammonium nutrition after 1-d culture in nitrogen-free nutrient solution. Ammonium supply led to a continuous increase in the asparagine content in wheat roots, whereas in tomato roots, the glutamine content increased 1 d after ammonium supply and thereafter the glutamine content was higher than the asparagine content. The amounts of amino acids synthesized from glucose-^<14>C increased while the amounts of organic acids decreased in tomato roots by the supply of ammonium nitrogen for 1 d, compared to the roots that did not receive nitrogen. In tomato roots, the proportion of labeled glutamine was higher than that of labeled asparagine and the C5 amino acids were more strongly labeled than the C4 amino acids. These findings were different from the previous ones in wheat roots where the proportion of asparagine was found to be extremely high (Koga and Ikeda 2000 : J. Fac. Agr. Kyushu Univ., 45, 7-13). To examine the in vivo asparagine synthesis, aspartate-^<14>C was fed to the roots. The labeling of asparagine, which was the most strongly labeled amino acid among the free amino acids, was remarkably strong in wheat roots whereas the labeling of glutamine was also pronounced in tomato roots. These results indicate that the ability to replenish carbon skeletons for amide synthesis in ammonium nutrition is different between tomato and wheat roots.
- 社団法人日本土壌肥料学会の論文
著者
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Ikeda Motoki
Department Of Agricultural Chemistry Kyushu University
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Ikeda Motoki
Department Of Plant Resources Kyushu University
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Koga Nobuhisa
Department Of Plant Resources Kyushu University:(present Address)national Hokkaido Agricultural Rese
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Koga Nobuhisa
Department Of Agricultural Chemistry Kyushu University
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Kusano Takeshi
Department of Plant Resources, Kyushu University
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Kusano Takeshi
Department Of Plant Resources Kyushu University:(present Address)japan Farm Co.
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Ikeda Motoki
Department of Plant Resources, Kyushu University
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