高土壌窒素条件下におけるダイズ窒素固定量および窒素固定寄与率の品種間差異

日本作物学会紀事

中山 則和²  中村 卓司²  丸山 幸夫³  野原 努³  島田 信二²  高橋 幹¹  有原 丈二⁴ 

[1] 国際農林水産業研究センター;作物研究所;筑波大学大学院生命環境科学研究科;中央農業総合研究センター

关键词: Cultivar difference;    品種間差異;    Fixed nitrogen;    窒素固定;    15N natural abundance;    15N自然存在比;    Nodule;    根粒;    Relative ureide method;    相対ウレイド法;    Soybean;    ダイズ;   

DOI  :  10.1626/jcs.75.350

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

To analyze the cultivar differences of nitrogen fixation capacity in soybean under a high soil nitrogen condition, we estimated the amount of nitrogen fixed during the growing season and the percentage of the amount of fixed nitrogen against the total accumulated nitrogen (RU-%Ndfa) by the relative ureide method,using eight genotypes including six common cultivars, a supernodulation cultivar and a non-nodulation line. Supernodulating cultivar, Sakukei 4, fixed the greatest amount of nitrogen in two years. American cultivars, Williams and Lee, had smaller amount of fixed nitrogen than Japanese normal cultivars in each maturity group. Especially, the amount of fixed nitrogen in the latter half of the growing period, which had a close positive correlation with the nodule weight in the middle growing period, was smaller in the American cultivars. RU-%Ndfa had a close positive correlation with the value estimated by 15N natural abundance method (δ15N-%Ndfa). The RU-%Ndfa was the highest in Sakukei 4 among all cultivars examined. The American cultivars had lower RU-%Ndfa than the Japanese normal cultivars in each maturity group. We concluded that, under a high nitrate condition, the amount of fixed nitrogen was smaller and RU-%Ndfa was lower in the American cultivars than in the Japanese normal cultivars, and the nodule weight in the middle growing period might contribute to these cultivar differences.

【 授权许可】

Unknown