Elevated CO_2 Concentrations Increase Leaf Nitrate Reduction by Strengthening Sink Activity in Soybean Plants
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概要
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An experiment was conducted to examine the effect of CO_2 enrichment on the nitrate uptake, nitrate reduction activity, and translocation of assimilated-N from leaves at varying levels of nitrogen nutrition in soybean using ^15N tracer technique. CO_2 enrichment significantly increased the plant biomass, apparent leaf photosynthesis, sugar and starch contents of leaves, and reduced-N contents of the plant organs only when the plants were grown at high levels of nitrogen. A high supply of nitrogen enhanced plant growth and increased the reduced-N content of the plant organs, but its effect on the carbohydrate contents and photosynthetic rate were not significant. However, the combination of high CO_2 and high nitrogen levels led to an additive effect on all these parameters. The nitrate reductase activity increased temporarily for a short period of time by CO_2 enrichment and high nitrogen levels. ^15N tracer studies indicated that the increase in the amount of reduced-N by CO_2 enrichment was derived from nitrate-N and not from fixed-N of the plant. To examine the translocation of reduced-N from the leaf in more detail, another experiment was conducted by feeding the plants with ^15NO_3-N through a terminal leaflet of an upper trifoliated leaf under depodding and / or CO_2 enrichment conditions. The export rate of ^15N from the terminal leaflet to other plant parts decreased by depodding, but it increased by CO_2 enrichment. CO_2 enrichment increased the percentage of plant ^15N in the stem and / or pods. Depodding increased the percentage of plant ^15N in the leaf and stem. The results suggested that the increase in the leaf nitrate reduction activity by CO_2 enrichment was due to the increase of the translocation of reduced-N from leaves through the strengthening of the sink activity of pods and / or stem for reduced-N.
- 社団法人日本土壌肥料学会の論文
著者
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ADU-GYAMFI Joseph
ICRISAT
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FUJITA Kounosuke
Faculty of Applied Biological Science, Hiroshima University
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Mohapatra Pravat
School Of Life Science Sambalpur University
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Mohapatra P
Hiroshima Univ. Higashi‐hiroshima Jpn
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Fujita K
Department Of Environmental Dynamics And Management Graduate School Of Biosphere Science Hiroshima U
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Fujita K
Graduate School Of Biosphere Science Hiroshima University
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Fujita K
Department Of Environmental Dynamics And Management Graduate School Of Biosphere Sciences Hiroshima
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Fujita Kounosuke
Faculty Of Applied Biological Science Hiroshima University
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Nobuyasu Hiroyuki
Faculty of Applied Biological Science, Hiroshima University
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Kuzukawa Takeshi
Faculty of Applied Biological Science, Hiroshima University
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Mohapatra Pravat
o IITA
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Adu-gyamfi Joseph
Icrisat-nigeria C
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Nobuyasu H
Faculty Of Applied Biological Science Hiroshima University
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Nobuyasu Hiroyuki
Faculty Of Applied Biological Science Hiroshima University
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Kuzukawa Takeshi
Faculty Of Applied Biological Science Hiroshima University
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