| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
The objective of this study was to genetically and physiologically elucidate sink-strength of rice grain, or the ability to attract and accumulate assimilates in grain, which is one of the indispensable plant traits for high-yielding. In this study, the evaluation method for grain-sink-strength was developed, grain-sink-strength of various cultivars were evaluated and chromosome region associating this sink-strength was investigated using chromosome segment substitute lines (CSSLs) derived from a cross between Koshihikari and Kasalath, contrasting in grain-sink-strength. We found an exponential relation between the proportion of filled spikelets and grain-filling percentage. There was a wide difference in the regression coefficients among cultivars and we considered the regression coefficient as the measure for grain-sink-strength. Based on this parameter, we found several chromosome regions which are considered to be associated with grain-sink-strength.
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