| Budget Amount *help |
¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000)
Fiscal Year 2014: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2013: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2012: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
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| Outline of Final Research Achievements |
Dry wind conditions during the grain-filling stage increase ring-shaped chalkiness in rice (Oryza sativa L.) to deteriorate grain quality. The objective of this study was to understand the physiological cause(s) on chalky ring formation induced by dry wind conditions. Kernel growth was maintained even at short-term moderately low water potential by osmotic adjustment with increased assimilate input. It has been suggested that starch synthesis was partially inhibited, but with little starch degradation. In addition, this short-term dry wind was thought to be different from the response at long-term high temperature conditions. Because the events observed at low water potential preceded the packing of starch granules in cells, we concluded that reduced rates of starch biosynthesis play a central role in the events of cellular metabolism altered at osmotic adjustment in advance of chalky ring formation under short-term dry wind conditions.
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