乾物生産量と蒸発散量の測定を介したダイズ (Glycine max (L.) Merr.) の共生窒素固定量の評価  [in Japanese] Estimation of the Amount of Symbiotic Nitrogen Fixation through the Measurements of Dry Matter Production and Evapotranspiration in Soybean (Glycine max (L.) Merr.)  [in Japanese]

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Abstract

乾物生産量と蒸発散量の測定を介して共生窒素固定量を評価する可能性を探るために, 根粒着生に関するダイズの同質遺伝子系統, T201 (根粒非着生系統) とT202 (根粒着生系統) をそれぞれ3段階および5段階の窒素 (N) 施用条件下で栽培した. T201の葉緑素含量 (SPAD値) はT202より低く推移し, また両系統の差は無Nから多N区へと順次拡大した. さらに, 根粒重 (Ndw) とSPAD値における系統間・処理区間差が大きくなるにつれて, 乾物生産量 (DM) と蒸発散量 (ET) の間の量的関係における違いが拡大した. 生育期間中のDMとETとの間には1次回帰式で表せる関係が認められ, DMが0のときを仮定したET (ET<SUB>w=0</SUB>) は T201よりもT202で大きく, またT201におけるET<SUB>w=0</SUB>は地面蒸発量 (E<SUB>0</SUB>) にほぼ一致した. 一方, N施用量によりT202のNdwとET<SUB>w=0</SUB>はともに変動し, 両者には密接な関係が認められた. T201とT202の間のET<SUB>w=0</SUB>差 (δET<SUB>w=0</SUB>) から推定したDM差 (δW) と両系統間のN集積量の差から評価した固定N量との間に有意な正の相関関係が認められた (P<0.001). これらの結果はN固定のエネルギー・コストに着目した共生窒素固定量の推定が可能であることを示している.

To investigate the possibility of estimating symbiotic nitrogen fixation through the measurements of dry matter production and evapotranspiration, we grew two isogenic lines of soybeans, non-nodulating line T201 and nodulating line T202 under three and five levels of nitrogen (N) application, respectively. The chlorophyll content (SPAD value) of T201 was lower than that of T202, and the difference between them expanded successively from the nil to high-N plot. As the difference in nodule dry weight (Ndw) and SPAD value became large between the two lines and among N application treatments, the difference in quantitative relationships between dry matter production (DM) and evapotranspiration (ET) became conspicuous. The value of ET (ET<SUB>w=0</SUB>) when DM was zero, which was determined from the regression lines, was higher in T202 than in T201, and ET<SUB>w=0</SUB> found in T201 corresponded nearly to evaporation from the bare soil surface (E<SUB>0</SUB>). Both ET<SUB>w=0</SUB> and Ndw in T202, on the other hand, varied with the amount of N application, and they were connected closely with each other. The difference in DM between T201 and T202 (δW) calculated from the difference in ET<SUB>w=0</SUB> (δET<SUB>w=0</SUB>) was correlated significantly and positively with the amount of fixed nitrogen estimated from the difference between the accumulated N in the two lines (P < 0.001). These results suggest that the amount of symbiotic nitrogen fixation can be estimated from DM and ET by paying attention to its energy cost.

Journal

  • Japanese Journal of Crop Science

    Japanese Journal of Crop Science 74(3), 344-349, 2005-09-05

    The Crop Science Society of Japan

References:  20

Codes

  • NII Article ID (NAID)
    110001840753
  • NII NACSIS-CAT ID (NCID)
    AN00189888
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    00111848
  • NDL Article ID
    7464517
  • NDL Source Classification
    ZR7(科学技術--農林水産--農産)
  • NDL Call No.
    Z18-342
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE  JASI 
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