Further Examination of Nitrogen Fixing Cost in Soybean (Glycine max L. Merr.) Based on the Dry Matter Production-Evapotranspiration Relation

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  • 乾物生産量と蒸発散量の測定を介したダイズの共生窒素固定コストの検討
  • 収量予測・情報処理・環境 乾物生産量と蒸発散量の測定を介したダイズの共生窒素固定コストの検討
  • シュウリョウ ヨソク ジョウホウ ショリ カンキョウ カンブツ セイサンリョウ ト ジョウハッサンリョウ ノ ソクテイ オ カイシタ ダイズ ノ キョウセイ チッソ コテイ コスト ノ ケントウ

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Abstract

The relationship between dry matter production (W) and evapotranspiration (ET) was examined in the normal nodulating soybean cultivar Enrei, the supernodulating line Kanto 100, and the non-nodulating line ‘En1282’. In addition, using the normal nodulating soybean cultivar Fukuyutaka (F) and the non-nodulating line ‘T201’ (T) grafted soybeans, F/F (scion/stock) and F/T with (+) and without (-) flower removal and 2F/F were prepared. The W-ET relation was examined in F/F (+), F/F (-), F/T (-), F/T (-) and 2F/F (-). The difference in ET between nodulating and non-nodulating soybeans (ΔET) increased with the amount of symbiotic nitrogen (N) fixation in the plants. The difference in W between nodulating and non-nodulating lines (ΔW) corresponding to ΔET, which was calculated from ΔET (kg H2O)/transpiration coefficient (kg H2O g-1 dry weight) in non-nodulating soybeans, was closely correlated with the nodule weight (Ndw) and the amount of symbiotic N fixation. Although the supernodulating line Kanto 100 had a much larger Ndw/ΔW ratio than the normal nodulating soybean cultivars, no significant difference in N fixing cost was detected among the soybean cultivars (0.098±0.006 Ng g-1 dry matter). We concluded that ΔW between the nodulating and the non-nodulating soybean lines is a good indicator of the amount of symbiotic N fixation.

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