水稻品种N22抗灰飞虱QTL的定位

ISmall brown planthopper (SBPH) and rice stripe virus (RSV) disease transmitted by SBPH are seriously damaged to rice (Oryza sativa L.) production. In the present study, 182 recombinant inbred lines (RILs) derived from a cross of the highly resistant variety N22 and the highly susceptible USSR5 was used to perform quantitative trait locus (QTL) analysis for SBPH resistance. In the modified seedbox screening test, three QTLs for SBPH resistance, qSBPH2a, qSBPH3a and qSBPH7a were mapped on chromosomes 2, 3 and 7. qSBPH7b and qSBPH11b conferring antibiosis against SBPH were detected on chromosomes 7 and 11. In addition, qSBPH5c and qSBPH7c expressing antixenosis to SBPH were detected on chromosomes 5 and 7, respectively. qSBPH7a, qSBPH7b, and qSBPH7c, were located in the same region between RM234 and RM429 on chromosome 7, indicates that the locus play a major role in conferring resistance to SBPH in N22., The molecular markers linked to these QTLs should be useful in the development of varieties with horizontal resistance to SBPH.