| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2010: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2009: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2008: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Research Abstract |
The brown planthopper[ BPH ; Nilaparvata lugens(Stal.)] is one of the most destructive insect pests in Asian rice-growing areas. Near-isogenic lines(NILs) for two genes conferring resistance to BPH, BPH25(t) and BPH26(t) derived from a BPH-resistant indica rice cultivar, 0ryza sativa ADR52, were developed. To characterize the virulence of the most recently migrated BPH strain in Asia, preliminary near-isogenic lines(pre-NILs) and a preliminary pyramided line(pre-PYL) carrying BPH25 and BPH26 were evaluated. Although both pre-NILs were susceptible to the virulent BPH strain, the pre-PYL exhibited a high level of resistance. The pyramiding of resistance genes is likely to be effbctive for increasing the durability of resistance against the new virulent BPH strain in Asia except Southern Vietnam.
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