^<15>N STUDY ON THE PARTITIONING OF THE NITROGEN TAKEN BY SOYBEANS FROM ATMOSPHERIC DINITROGEN, MEDIUM NITRATE OR AMMONIUM
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概要
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Soybean plants (Glycine max, cv. Akisengoku) were water-grown in a greenhouse with a low concentration of nitrate in the culture solution. Under these conditions root nodulation mostly on primary roots was profuse. At the vegetative and pod-filling stages, plants were fed ^<15>N-labeled dinitrogen, nitrate, or ammonium for 7 to 8 hr in the daytime. Partitioning of the ^<15>N from the three nitrogen sources showed distinct characteristics. The nitrogen (N) from dinitrogen preferentially distributed to the developing organs, young leaves, and developing pods, in comparison with N from nitrate. N from ammonium showed distribution pattern similar to that of N from dinitrogen. The nodule N was supplied by both directly fixed-N and transferred nitrogen, and fixed-N was inferred to play a major role in this process. The protein N in the roots could be furnished by the recycled N of dinitrogen and nitrate through the shoots along with direct incorporation of amino acids produced in the roots from nitrate.
- 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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ISHIZUKA Junzi
Division of Plant Nutrition, National Institute of Agricultural Sciences
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Ishizuka Junzi
Division Of Plant Nutrition National Institute Of Agricultural Sciences
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