ダイズの根粒活性制御機構の解明 (第2報) : ダイズの根粒活性と光合成産物濃度との関係

DOI Web Site 参考文献23件
  • 田村 有希薄
    東北農業試験場:(現)富山県農業技術センター農業試験場

書誌事項

タイトル別名
  • Clarification of Control System of Soybean Nodule Activity (No. 2) : Relationship between Nodule Activity and Concentration of Photosynthetic Product of Soybean
  • ダイズ ノ コンリュウ カッセイ セイギョ キコウ ノ カイメイ ダイ 2ホウ

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It is necessary to make nitrogen fertilization and nitrogen fixation compatible in order to obtain a large quantity of nitrogen absorption, which is a main contributor to the yield of soybean. However, it is known that the specific activity of soybean nodules is inversely proportional to the nitrogen concentration of the leaves. It is important to understand the control mechanism of nodule activity. Therefore, we examined the relationship between sugar content, as the photosynthetic product, and nodule activity in soybean. The results are summarized as follows. 1) When the nitrogen concentration of the leaves was increased by nitrogen fertilization, the photosynthetic ability of the lower node leaf of the main stem was extremely decreased and nodule activity of the soybean declined. 2) The relationship between leaf nitrogen concentration and root glucose concentration showed negative linear regression, but root glucose concentration and specific activity of the nodule showed positive linear regression. The following was estimated from above the results. Because the nitrogen concentration of the leaves was increased by nitrogen fertilization, the photosynthetic ability of the lower node leaf of the main stem was decreased. This decrement of photosynthetic ability caused the decrement of glucose concentration in the roots, resulting in a decline in nodule activity. It is believed that the mechanism of the feedback control system of nodule activity is managed by the host plant.

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