Functions of nitrogen accumulation and redistribution in leaves and its contribution to seed yield in soybean
| Project/Area Number |
22580016
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Crop science/Weed science
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| Research Institution | Saga University |
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Principal Investigator |
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2011: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2010: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | ダイズ / 子実収量 / 窒素蓄積 / 老化 / 子実肥大 |
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| Research Abstract |
It is well known that large amount of nitrogen are redistributed from vegetative organs to the seeds during seed filling in soybean (Glycine max [L.] Merrill). However, the role of distributed nitrogen from leaves on the seed yield production are not clear. The functions of nitrogen accumulation and redistribution in leaves and its contribution to the seed yield were evaluated. The redistributed nitrogen was estimated by the difference in the nitrogen contents between R5 and R7 stage. The nitrogen content in leaves began decreasing after R5 stage in all cultivars, indicating the start of nitrogen redistribution. About 13.8% to 37.9% of the total nitrogen in the seeds was estimated being redistributed from the leaf tissues among ten cultivars. The seed yield was correlated positively with the amount of redistributed nitrogen from leaves but with neither the nitrogen concentration in the leaves at R5 nor the proportion of redistributed nitrogen in the seeds. However, in high seed yielding year, the seed yield is not likely associated with nitrogen redistribution, even the lowest nitrogen redistribution was associated with relatively higher seed yield in Tamahomare. Furthermore, enhanced nitrogen concentration increased the seed yield before seed filling in Sachiyutaka, which is dependent on the nitrogen redistribution, whereas after seed filling in Tamahomare, which is independent of the nitrogen redistribution. The results indicated that large nitrogen redistribution does not always contribute to high seed yielding, implying the direct nitrogen uptake during seed filling could be more important factor for high seed yielding depend on the cultivars.
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Report
(4 results)
Research Products
(4 results)
