Alteration in Intra-plant Distribution of δ^<15> N in Response to Shading in Legumes(Crop Physiology and Ecology)

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概要

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• The intra-plant distribution of ^<15>N in common bean, cowpea and soybean having different levels of responses to shading and N_2-fixing ability were analyzed under shaded and non-shaded conditions. Maize was used as a reference (non N_2-fixing) plant. Seedlings were grown in pot soils for 3 weeks then transferred to shaded (55% of control) and non-shaded (control) conditions in a greenhouse, and sampled at 13 days and 24 days after shading. The proportion of plant N derived from N_2-fixation (%Ndfa) estimated by the natural ^<15>N abundance method was higher in cowpea and soybean (74-91%) than in common bean (37-38%). Shade treatment reduced %Ndfa significantly in cowpea and soybean. The difference in δ^<15>N between shoot and root (Δδ^<15>N_<s-r>) was the highest in maize followed by common bean, cowpea and soybean. Shading increased Δδ^<15>N_<s-r> in each legume species, particularly in cowpea and soybean. A significant negative correlation was found between Δδ^<15>N_<s-r> and %Ndfa in all legumes at both sampling dates (R^2=0.67-0.96, P<0.1). The slope and Y-intercept of the regression line was similar at the sampling dates, but varied with the species. The slope was -0.05 in cowpea, -0.06 in common bean, and -0.11 in soybean. The Δδ^<15>N_<s-r> value estimated by extrapolation of the regression line was 2.9, 2.5 and 8.6‰ at 0 %Ndfa, and -3.2, -2.8 and -2.6‰ at 100 %Ndfa, in common bean, cowpea and soybean, respectively. The consistent relationships between Δδ^<15>N_<s-r> and %Ndfa found among legume species suggest that Δδ^<15>N_<s-r> could be used as a parameter for estimating %Ndfa without using a reference plant, although the component of regression line was characteristically different among legume species.

• 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

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