Effects of Ammonium and Nitrate Assimilation on the Growth and Tuber Swelling of Potato Plants
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概要
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Effect of NH_4-N and NO_3-N on plant growth and tuber swelling of potato plant (Solanum tuberosum L.) was examined, and the results obtained were as follows. 1) NH_4-N stimulated tuber swelling, while NO_3-N stimulated the branching of stolons and stems, and shoot growth. 2) In plants grown with NH_4-N, a large amount of ^<15>NH_4-N was mainly partitioned into tubers and stems, whereas in plants grown with NO_3-N, ^<15>NO_3-N was mainly partitioned into leaves, especially into the insoluble fraction. 3) Aspartic acid plus asparagine (Asx) in tubers predominated among amino acids and amides when the plants were grown with NH_4-N. Also ^<15>NH_4-N was incorporated into Asx in tubers, while, ^<15>NO_3-N was presumably transported to tubers in the form of Asx, which subsequently was actively metabolized into other amino acids in tubers. Thus, as the nitrogen form of NH^+_4 appeared to stimulate the Asx metabolism, Asx was transported to tubers, and mainly stored in tubers. On the other hand, the nitrogen form of NO^-_3 was mainly transported into leaves, and NO_3-N promoted vegetative growth.
- 社団法人日本土壌肥料学会の論文
著者
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OSAKI Mitsuru
Laboratory of Ecological Chemistry, Division of Applied Bioscience, Graduate School of Agriculture,
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Shirai Jun
Laboratory Of Plant Nutrition Faculty Of Agriculture Hokkaido University:(present Address)amino-up C
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Shinano Takuro
Laboratory of Plant Nutrition, Faculty of Agriculture, Hokkaido University
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Tadano Toshiaki
Laboratory of Plant Nutrition, Faculty of Agriculture, Hokkaido University
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Tadano Toshiaki
Laboratory Of Plant Nutrition Faculty Of Agriculture Hokkaido University
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