Effect of CO_2 Enrichment on Carbon and Nitrogen Interaction in Wheat and Soybean
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概要
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Effect of CO_2 enrichment on the carbon-nitrogen balance in whole plant and the acclimation of photosynthesis was studied in wheat (spring wheat) and soybean (A62-1 [nodulated] and A62-2 [non-nodulated]) with a combination of two nitrogen application rates (0 g N land area m^<-2%gt; and 30 g N land area m^<-2>) and two temperature treatments (30/20℃ (day/night) and 26/16℃). Results were as follows. 1. Carbon (dry matte)-nitrogen balance of whole plant throughout growth was remarkably different between wheat and soybean, as follows: 1) in wheat, the relationship between the amount of dry matter (DMt) and amount of nitrogen absorbed (Nt) in whole plant was expressed by an exponential regression, in which the regression coefficient was affected by only the nitrogen application rate, and not by CO_2 and temperature treatments, and 2) in soybean the DMt-Nt relationship was basically expressed by a linear regression, in which the regression coefficient was only slightly affected by the nitrogen treatment (at 0N, DMt-Nt balance finally converged to a linear regression). Thus, carbon-nitrogen interaction in wheat was strongly affected by the underground environment (nitrogen nutrition), but not by the above ground environment (CO_2 enrichment and temperature), while that in soybean was less affected by both under and above ground environments. 2. The photosynthetic response curve to CO_2 concentration in wheat and soybean was less affected by the CO_2 enrichment treatment, while that in wheat and soybean (A62-2) was affected by the nitrogen treatment, indicating that nitrogen nutrition is a more important factor for the regulation of photosynthesis regardless of the CO_2 enrichment. 3. Carbon isotope discrimination (Δ) in soybean was similar to that in wheat under ambient CO_2, while lower than that in wheat under CO_2 enrich ment, suggesting that the carbon metabolism is considerably different between wheat and soybean under the CO_2 enrichment conditions.
- 社団法人日本土壌肥料学会の論文
著者
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Takagi Kentaro
Teshio Experimental Forest Field Science Center For Northern Biosphere Hokkaido University
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大崎 満
北大 農
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Nakamura Takuji
Laboratory Of Plant Nutrition Faculty Of Agriculture Hokkaido University:(present Address)icrisat
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OSAKI Mitsuru
Laboratory of Ecological Chemistry, Division of Applied Bioscience, Graduate School of Agriculture,
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Koike Takayoshi
Southern Forestry And Development Office Field Science Center For Northern Biosphere Hokkaido Univer
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Hanba T.yuko
Center For Ecological Research Kyoto University:(present Address)institute Of Biological Science Uni
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Wada Eitaro
Center Ecol. Study Kyoto University
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Tadano Toshiaki
Laboratory of Plant Nutrition, Faculty of Agriculture, Hokkaido University
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Nakamura Takuji
Laboratory Of Atmospheric Sensing And Diagnosis Rish Kyoto University
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Koike Takayoshi
Forestry and Forest Products Research Institute, Hokkaido Research Center, Japanese Forestry Agency
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Tadano Toshiaki
Laboratory Of Plant Nutrition Faculty Of Agriculture Hokkaido University
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Koike Takayoshi
Forest Environment Research Tokyo University Of Agriculture And Technology
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