DISTRIBUTION OF NITROGEN ABSORBED DURING DIFFERENT TIMES OF GROWTH IN THE PLANT PARTS OF WHEAT AND CONTRIBUTION TO THE GRAIN AMINO ACIDS
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概要
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Wheats (Triticum aestivum L. cv. Norin 61) were grown in culture solution in a greenhouse. The growth season was divided into six periods, and ^<15> N labeling was applied during each period to different plants by supplying ^<15>N-labeled KNO_3. Partitioning of the label in the plant parts and in the proteins and amino acids of the grains was investigated. Loss of nitrogen (N) from the plants was observed only for N absorbed early. N in each plant part was composed of newly absorbed N and retranslocated N, and N loss from a part was faster in the case of late partitioned N than early partitioned N. A considerable amount of N was estimated to be transferred to the ears after being distributed to other parts. No significant differences in the distribution of the N absorbed at the different times of growth among the protein fractions of the grains were detected. Although the grain amino acids were synthesized with the N supplied any time during the growing season, there were some distinct differences in the preferential dependence of N origin on the time of N absorption. The dependence of lysine, histidine+arginine, and valine on early absorbed N was relatively more pronounced than in the case of glutamic acid, aspartic acid, and alanine, while the reverse was observed for N absorbed in later stages of growth.
- 一般社団法人日本土壌肥料学会の論文
著者
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Yoneyama Tadakatsu
Division Of Environmental Biology National Institute For Environmental Studies
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Yoneyama Tadakatsu
Division of Plant Nutrition, National Institute of Agricultural Sciences
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