title: Detection of quantitative trait loci (QTLs) for resistances to small brown planthopper and rice stripe virus in rice using recombinant inbred lines.
abstract: Small brown planthopper (SBPH) and rice stripe virus (RSV) disease transmitted by SBPH cause serious damage to rice (Oryza sativa L.) in China. In the present study, we screened 312 rice accessions for resistance to SBPH. The indica variety, N22, is highly resistant to SBPH. One hundred and eighty two recombinant inbred lines (RILs) derived from a cross of N22 and the highly susceptible variety, USSR5, were used for quantitative trait locus (QTL) analysis of resistances to SBPH and RSV. In a modified seedbox screening test, three QTLs for SBPH resistance, qSBPH2, qSBPH3 and qSBPH7.1, were mapped on chromosomes 2, 3 and 7, a total explaining 35.1% of the phenotypic variance. qSBPH7.2 and qSBPH11.2, conferring antibiosis against SBPH, were detected on chromosomes 7 and 11 and accounted for 20.7% of the total phenotypic variance. In addition, qSBPH5 and qSBPH7.3, expressing antixenosis to SBPH, were detected on chromosomes 5 and 7, explaining 23.9% of the phenotypic variance. qSBPH7.1, qSBPH7.2 and qSBPH7.3, located in the same region between RM234 and RM429 on chromosome 7, using three different phenotyping methods indicate that the locus or region plays a major role in conferring resistance to SBPH in N22. Moreover, three QTLs, qSTV4, qSTV11.1 and qSTV11.2, for RSV resistance were detected on chromosomes 4 and 11. qSTV11.1 and qSTV11.2 are located in the same region between RM287 and RM209 on chromosome 11. Molecular markers spanning these QTLs should be useful in the development of varieties with resistance to SBPH and RSV.
authors.affiliation: State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Provincial Center of Plant Gene Engineering, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China. wanjm@njau.edu.cn.
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
authors.forename: Yuqiang
authors.initials: Y
authors.lastname: Liu
authors.forename: Jinlong
authors.initials: J
authors.lastname: Hu
authors.forename: Yingxin
authors.initials: Y
authors.lastname: Zhang
authors.forename: Kun
authors.initials: K
authors.lastname: Xie
authors.forename: Baoxiang
authors.initials: B
authors.lastname: Wang
authors.forename: Le Quang
authors.initials: le Q
authors.lastname: Tuyen
authors.forename: Zhaoqiang
authors.initials: Z
authors.lastname: Song
authors.forename: Han
authors.initials: H
authors.lastname: Wu
authors.forename: Yanling
authors.initials: Y
authors.lastname: Liu
authors.forename: Ling
authors.initials: L
authors.lastname: Jiang
authors.forename: Shijia
authors.initials: S
authors.lastname: Liu
authors.forename: Xianian
authors.initials: X
authors.lastname: Cheng
authors.forename: Chunming
authors.initials: C
authors.lastname: Wang
authors.forename: Huqu
authors.initials: H
authors.lastname: Zhai
authors.forename: Jianmin
authors.initials: J
authors.lastname: Wan
mesh_terms: D000818:Animals; D002681:China; D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000235:genetics; D017343:Genes, Plant; D006430:Hemiptera / Q000472:pathogenicity*; D012275:Oryza / Q000235:genetics* / Q000469:parasitology / Q000821:virology; D010935:Plant Diseases / Q000235:genetics* / Q000469:parasitology / Q000821:virology; D040641:Quantitative Trait Loci; D029364:Tenuivirus / Q000472:pathogenicity*