title: Construction of a genetic linkage map and analysis of quantitative trait loci associated with the agronomically important traits of Pleurotus eryngii.
abstract: Breeding new strains with improved traits is a long-standing goal of mushroom breeders that can be expedited by marker-assisted selection (MAS). We constructed a genetic linkage map of Pleurotus eryngii based on segregation analysis of markers in postmeiotic monokaryons from KNR2312. In total, 256 loci comprising 226 simple sequence-repeat (SSR) markers, 2 mating-type factors, and 28 insertion/deletion (InDel) markers were mapped. The map consisted of 12 linkage groups (LGs) spanning 1047.8cM, with an average interval length of 4.09cM. Four independent populations (Pd3, Pd8, Pd14, and Pd15) derived from crossing between four monokaryons from KNR2532 as a tester strain and 98 monokaryons from KNR2312 were used to characterize quantitative trait loci (QTL) for nine traits such as yield, quality, cap color, and earliness. Using composite interval mapping (CIM), 71 QTLs explaining between 5.82% and 33.17% of the phenotypic variations were identified. Clusters of more than five QTLs for various traits were identified in three genomic regions, on LGs 1, 7 and 9. Regardless of the population, 6 of the 9 traits studied and 18 of the 71 QTLs found in this study were identified in the largest cluster, LG1, in the range from 65.4 to 110.4cM. The candidate genes for yield encoding transcription factor, signal transduction, mycelial growth and hydrolase are suggested by using manual and computational analysis of genome sequence corresponding to QTL region with the highest likelihood odds (LOD) for yield. The genetic map and the QTLs established in this study will help breeders and geneticists to develop selection markers for agronomically important characteristics of mushrooms and to identify the corresponding genes.
authors.affiliation: Environment-friendly Research Division, Gyeongsangnam-do Agricultural Research and Extension Services, Jinju, Republic of Korea. Electronic address: chakhanim@epost.kr.
authors.forename: Chak Han
authors.initials: CH
authors.lastname: Im
authors.affiliation: Department of Horticultural Bioscience, Pusan National University, Milyang, Republic of Korea.
authors.forename: Young-Hoon
authors.initials: YH
authors.lastname: Park
authors.affiliation: US Forest Products Laboratory, Madison, WI, USA. Electronic address: kehammel@facstaff.wisc.edu.
authors.forename: Kenneth E
authors.initials: KE
authors.lastname: Hammel
authors.affiliation: Environment-friendly Research Division, Gyeongsangnam-do Agricultural Research and Extension Services, Jinju, Republic of Korea.
authors.forename: Bokyung
authors.initials: B
authors.lastname: Park
authors.affiliation: Department of Plant Bioscience, Pusan National University, Milyang, Republic of Korea.
authors.forename: Soon Wook
authors.initials: SW
authors.lastname: Kwon
authors.affiliation: Department of Biology, Chungbuk National University, Cheongju, Republic of Korea.
authors.forename: Hojin
authors.initials: H
authors.lastname: Ryu
authors.affiliation: Environment-friendly Research Division, Gyeongsangnam-do Agricultural Research and Extension Services, Jinju, Republic of Korea. Electronic address: coolmush88@gmail.com.
authors.forename: Jae-San
authors.initials: JS
authors.lastname: Ryu
mesh_terms: D001947:Breeding; D002874:Chromosome Mapping; D003433:Crosses, Genetic; D008040:Genetic Linkage; D005819:Genetic Markers; D018895:Microsatellite Repeats / Q000235:genetics; D010641:Phenotype; D020076:Pleurotus / Q000235:genetics* / Q000254:growth & development; D040641:Quantitative Trait Loci / Q000235:genetics*
chemical_list: D005819:Genetic Markers
keywords: Breeding; Genetic map; Pleurotus eryngii; QTL; Trait marker