| Budget Amount *help |
¥19,500,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥4,500,000)
Fiscal Year 2013: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2012: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2011: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
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| Outline of Final Research Achievements |
Under elevated CO2 conditions, physiological functions of crops decline at the later growth stages although they are enhanced at the early growth stages, and this phenomenon is known as downregulation. The objectives of this study was identify physiological factors and traits of genotypes which confer adaptability to elevated CO2 conditions by mitigating the magnitude of the downregulation, which should suggest the direction toward genetic improvementment of soybean cultivars. A supernodulating genotype was capable of maintaining N content level and photosynthesis under elevated CO2 conditions, but this favorable function did not lead to an increase in sink formation. An indeterminate genotype showed a decline in N content with growth under elevated CO2 conditions, which appears to be a major factor causing downregulation. Breeding directions toward improving cultivars adaptable to incerasing CO2 concentration are suggested based on these results.
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