Assignment of a Brown Planthopper(Nilaparvata lugens Stal) Resistance Gene bph4 to the Rice Chromosome 6.
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概要
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A Sri Lankan indica rice (<I>Oryza sativa</I> L.) cultivar Babawee harboring a brown planthopper (BPH)(<I>Nilaparvata lugens</I> Stål) resistance gene <I>bph4</I> was crossed as a male parent with two susceptible cultivars, either <I>indica</I> IR24 or <I>japonica</I> Tsukushibare. Segregation of the BPH resistance in the two crosses was studied by directly assaying the F<SUB>2</SUB> phenotypes and by determining the F<SUB>2</SUB> genotypes based on the F<SUB>3</SUB> phenotypes. In both cross combinations, the segregation of the BPH resistance significantly deviated from the ratio expected for the single recessive gene model. Using bulked DNAs of homozygous resistant and susceptible F<SUB>2</SUB>s and the parents, seven out of 214 RFLP markers were selected as linked markers, of which six on chromosome 6 were common in the two cross combinations. Two microsatellite markers on chromosome 6 were also linked to <I>bph4</I>. Although the map position of <I>bph4</I> could not be determined, the gene was assigned to the distal region of the short arm of rice chromosome 6 based on the bulked segregant analysis and linkage analysis.
- 日本育種学会の論文
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