title: Trichome density of main stem is tightly linked to PepMoV resistance in chili pepper (Capsicum annuum L.).
abstract: A relationship between pepper trichome and pepper mottle virus (PepMoV) resistance was examined. In an intraspecific F(2) mapping population from the cross between Capsicum annuum CM334 (trichome-bearing and PepMoV resistant) and Chilsungcho (glabrous and PepMoV susceptible), major QTLs for both traits were identified by composite interval mapping in linkage group (LG) 24 corresponding a telomere region on pepper chromosome 10. Ptel1 of putative trichome enhancing locus was a common major QTL for trichome density on the main stem and calyx. Ptel1 apart from HpmsE031 at a 1.03 cM interval was specifically associated to the trichome density on the main stem, whereas Ptel2 near m104 marker on LG2 was specific for the calyx trichome. Epistatic analysis indicated that Ptel1 engaged in controlling the trichome density by mutual interactions with the organ-specific QTLs. For PepMoV resistance, two QTLs (Pep1 and Pep2) were identified on the LG 24. Pep1 was located with Ptel1 in the R-gene cluster (RGC) for potyvirus resistance including Pvr4 with broad spectrum resistance to potyviruses. Pep1 flanking TG420 marker seemed to be the major factors determining correlation with PepMoV resistance. These results indicate that the level of trichome density on pepper main stem can be used as a morphological marker for Pvr4 in pepper breeding.
authors.affiliation: Department of Plant Sciences and Plant Genomics and Breeding Institute, Seoul National University, Seoul, Korea.
authors.forename: Hyun Jung
authors.initials: HJ
authors.lastname: Kim
authors.forename: Jung-Heon
authors.initials: JH
authors.lastname: Han
authors.forename: Seungill
authors.initials: S
authors.lastname: Kim
authors.forename: Heung Ryul
authors.initials: HR
authors.lastname: Lee
authors.forename: Jun-Sung
authors.initials: JS
authors.lastname: Shin
authors.forename: Jeong-Ho
authors.initials: JH
authors.lastname: Kim
authors.forename: Juok
authors.initials: J
authors.lastname: Cho
authors.forename: Young Ho
authors.initials: YH
authors.lastname: Kim
authors.forename: Hee Jae
authors.initials: HJ
authors.lastname: Lee
authors.forename: Byung-Dong
authors.initials: BD
authors.lastname: Kim
authors.forename: Doil
authors.initials: D
authors.lastname: Choi
mesh_terms: D002212:Capsicum / Q000033:anatomy & histology* / Q000235:genetics* / Q000276:immunology / Q000821:virology; D002874:Chromosome Mapping; D032461:Chromosomes, Plant; D004843:Epistasis, Genetic; D007113:Immunity, Innate / Q000235:genetics*; D010641:Phenotype; D010935:Plant Diseases / Q000235:genetics / Q000821:virology*; D018547:Plant Stems / Q000033:anatomy & histology*; D017800:Potyvirus / Q000472:pathogenicity*; D040641:Quantitative Trait Loci