title: Development of genetic markers linked to straighthead resistance through fine mapping in rice (Oryza sativa L.).
abstract: Straighthead, a physiological disorder characterized by sterile florets and distorted spikelets, causes significant yield losses in rice, and occurs in many countries. The current control method of draining paddies early in the season stresses plants, is costly, and wastes water. Development of resistant cultivar is regarded as the most efficient way for its control. We mapped a QTL for straighthead resistance using two recombinant inbred line (RIL) F(9) populations that were phenotyped over two years using monosodium methanearsonate (MSMA) to induce the symptoms. One population of 170 RILs was genotyped with 136 SSRs and the other population of 91 RILs was genotyped with 159 SSRs. A major QTL qSH-8 was identified in an overlapping region in both populations, and explained 46% of total variation in one and 67% in another population for straighthead resistance. qSH-8 was fine mapped from 1.0 Mbp to 340 kb using 7 SSR markers and further mapped to 290 kb in a population between RM22573 and InDel 27 using 4 InDel markers. SSR AP3858-1 and InDel 11 were within the fine mapped region, and co-segregated with straighthead resistance in both RIL populations, as well as in a collection of diverse global accessions. These results demonstrate that AP3858-1 and InDel 11 can be used for marker-assisted selection (MAS) for straighthead resistant cultivars, which is especially important because there is no effective way to directly evaluate straighthead resistance.
authors.affiliation: Rice Research Institute, Sichuan Agricultural University, Chengdu, China.
authors.forename: Xuhao
authors.initials: X
authors.lastname: Pan
authors.forename: Qijun
authors.initials: Q
authors.lastname: Zhang
authors.forename: Wengui
authors.initials: W
authors.lastname: Yan
authors.forename: Melissa
authors.initials: M
authors.lastname: Jia
authors.forename: Aaron
authors.initials: A
authors.lastname: Jackson
authors.forename: Xiaobai
authors.initials: X
authors.lastname: Li
authors.forename: Limeng
authors.initials: L
authors.lastname: Jia
authors.forename: Bihu
authors.initials: B
authors.lastname: Huang
authors.forename: Peizhou
authors.initials: P
authors.lastname: Xu
authors.forename: Fernando
authors.initials: F
authors.lastname: Correa-Victoria
authors.forename: Shigui
authors.initials: S
authors.lastname: Li
mesh_terms: D032461:Chromosomes, Plant / Q000235:genetics; D003433:Crosses, Genetic; D060467:Disease Resistance / Q000235:genetics*; D008040:Genetic Linkage; D005819:Genetic Markers; D005838:Genotype; D054643:INDEL Mutation / Q000235:genetics; D007178:Inbreeding; D018895:Microsatellite Repeats / Q000235:genetics; D012275:Oryza / Q000235:genetics* / Q000276:immunology*; D010641:Phenotype; D020161:Physical Chromosome Mapping; D010935:Plant Diseases / Q000235:genetics* / Q000276:immunology*; D011110:Polymorphism, Genetic; D040641:Quantitative Trait Loci / Q000235:genetics; D011995:Recombination, Genetic / Q000235:genetics; D015203:Reproducibility of Results
chemical_list: D005819:Genetic Markers