Effect of Pod Removal on Absorption and Reduction of Nitrate in Soybean
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概要
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The effect of the sink activity for nitrogen (N) on the uptake, translocation, and reduction of nitrate has not been fully elucidated. An experiment was conducted to examine the effect of pod removal during the pod filling period on the accumulation of nitrate and redueed-N in soybean (Glycine max L. Merr. cv. Tamahomare) grown under field and hydroponic conditions. Pod removal led to a significant decrease in the leaf nitrate reduetase activity 5-10 d after treatment (DAT). In contrast, partial defoliation increased the nitrate reduetase activity at 5 DAT. These results indicate that the nitrate reduetase activity is regulated by the sink activity of pods for N at the grain filling stage. The amount of total N (redueed-N plus nitrate-N) in a whole plant decreased by pod removal, suggesting that nitrate uptake is also controlled by the sink activity of pods. Pod removal increased the amount of nitrate-N and did not affect significantly the carbohydrate concentration in the leaves, indicating that nitrate and energy supply might not be involved in the inhibition of nitrate reductase activity. Pod removal decreased the amount of redueed-N significantly at 10 DAT, whereas it increased the amount of nitrate-N at 5 DAT. These results suggest that when the sink activity is reduced by depodding, nitrate reduction is more markedly impaired than nitrate uptake by roots, and its subsequent transport from roots to shoot. From these results, it is assumed that the uptake and reduction of nitrate are controlled by the sink activity of pods for N in a soybean cultivar.
- 社団法人日本土壌肥料学会の論文
著者
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FUJITA Kounosuke
Faculty of Applied Biological Science, Hiroshima University
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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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Morita Tatsumi
Faculty of Applied Biological Science, Hiroshima University
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Morita Tatsumi
Faculty Of Applied Biological Science Hiroshima University
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Nobuyasu Hiroyuki
Faculty Of Applied Biological Science Hiroshima University
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