| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2009: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Research Abstract |
Linkage analysis of the genes causing hybrid chlorosis in F2 generation in rice, HCA1 and HCA2, was performed. HCA1 and HCA2 were located on the distal regions of the short arms of chromosome 12 and 11, respectively. The regions are known to be highly conserved as a duplicated chromosomal segment. Therefore, HCA1 and HCA2 are thought to be homoeologous genes to each other, and the loss-of-function mutation of these genes are thought to be the cause of hybrid chlorosis. Weak plants segregated in the F2 population from the cross between the two rice cultivars, IR36 and Jamaica. The causal recessive gene from Jamaica was located on the long arm of chromosome 1. The fine mapping of this gene narrowed down the area of interest to 30 kb. The distribution of these reproductive-barrier-genes among the world rice core collection and the Japanese rice landlace core collection was surveyed, and the origin of these genes was discussed.
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