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- W969259871 abstract "Studies of varietal resistance to the brown planthopper (BPH) started at the International Rice Research Institute in 1966. Since then, nearly 26,000 entries from the world germplasm collection have been screened. Biotype studies started in 1971 and three biotypes were identified by 1974. About 42,000 breeding lines were tested for biotype resistance through 1975. Studies on the inheritance of resistance to BPH started in 1968. The mechanisms of BPH resistance are examined in preference and antibiosis studies and in tolerance tests. Intensive cultivation of rice resistant to BPH increases the possibility of development of new biotypes. Natural BPH populations are believed to include small proportions of insects that survive on resistant varieties. IRRl studies in the Philippines include planting different varieties in many areas to determine if a variety resistant at one site becomes susceptible at another, and the several-generation rearing on resistant varieties of BPH collected from various areas where resistant varieties are intensively cultivated. No additional biotypes have been isolated. Biotype 2 has become preponderant. Multiline plantings at IRRl in 1976 showed a decrease in number of BPH as the number of resistant plants increased. Four resistant varieties were genetically analyzed in 1968 studies and two Ioci of BPH resistance were identified— Bph 1 and bph 2. In 1976 two new genes for resistance were identified— Bph 3 and bph 4. Mudgo and lR7476,-6 were used since 1967 as donor parents for Bph 1, and lR1154-243 and CR94-13 as donors of bph 2. Important varieties from IR747B 2 -6 crosses were IR28, IR29, and IR34. CR94-13 was used extensively as a source of bph 2, and two crosses, IR2070 and IR2071, had outstanding BPH resistance. IR32, IR38, and IR40 were selected from IR2070; IR36 and IR42 from IR2071. About half of IRRl’s breeding materials have Bph 7 and the other half have bph 2. Efforts are under way to incorporate Bph 3 and bph 4." @default.
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- W969259871 date "1979-01-01" @default.
- W969259871 modified "2023-09-23" @default.
- W969259871 title "Studies of varietal resistance in rice to the brown planthopper at the International Rice Research Institute." @default.
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