Difference in δ^<15>N Signatures among Plant Parts of Perennial Species Subjected to Drought Stress with Special Reference to the Contribution of Symbiotic N_2-fixation to Plant N(Crop Physiology and Ecology)

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概要

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• The ^<15>N natural abundance method has been widely used for evaluation of symbiotic N_2-fixation. The method inevitably requires a reference plant that reflects soil derived δ^<15>N similar to that in a N_2-fixing target plant, for estimating the contribution of fixed N_2. However, it is often difficult to select a suitable reference plant. Recently, an alternative method was proposed using the difference in δ^<15>N values between shoots and nodulated roots, which did not require a reference plant per se. Whether this method is applicable to a wide range of N_2-fixing plants having different growth habits and symbiosis types remains to be verified. To test the applicability of this method for perennial plants, we examined the difference in δ^<15>N values between shoot and nodulated root (⊿δ^<15>N_<s_nr>), and that between shoot and root (⊿δ^<15>N_<s-r>) in 6-month-old plants grown in pots with different soil moisture regimes. The relationships between ⊿δ^<15>N_<s-nr> and the percentage of N derived from atmospheric N_2 (%Ndfa) calculated from the conventional ^<15>N natural abundance method, and between ⊿δ^<15>N_<s-r> and %Ndfa were analyzed in N_2-fixing legume Lespedeza cuneata and N_2-fixing non-legume Elaeagnus pungens and Myrica rubra. A close correlation was found between ⊿δ^<15>N_<s-nr> and %Ndfa as well as between ⊿δ^<15>N_<s-r> and %Ndfa in Lespedeza cuneata, while no correlation was found in N_2-fixing non-legume species. The results indicated that ⊿δ^<15>N signatures could be useful for estimating %Ndfa for N_2-fixing perennial legume (Lespedeza cuneata) in the first growth season but might not be applicable for N_2-fixing actinorhizal plants.

• 日本作物学会の論文

著者

• Tatsumi Jiro

  Graduate School of Bioagricultural Sciences,Nagoya University

• Tatsumi Jiro

  Graduate School Of Bioagricultural Sciences Nagoya University

• Khadka Janardan

  Graduate School Of Bioagricultural Sciences Nagoya University

• Tatsumi Jiro

  Graduate School of Bioagricultural Science, Nagoya University

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