title: Detection of QTLs for traits associated with pre-harvest sprouting resistance in bread wheat (Triticum aestivum L.).
abstract: Pre-harvest sprouting (PHS) is one of the serious problems for wheat production, especially in rainy regions. Although seed dormancy is the most critical trait for PHS resistance, the control of heading time should also be considered to prevent seed maturation during unfavorable conditions. In addition, awning is known to enhance water absorption by the spike, causing PHS. In this study, we conducted QTL analysis for three PHS resistant related traits, seed dormancy, heading time and awn length, by using recombinant inbred lines from 'Zenkouji-komugi' (high PHS resistance) × 'Chinese Spring' (weak PHS resistance). QTLs for seed dormancy were detected on chromosomes 1B (QDor-1B) and 4A (QDor-4A), in addition to a QTL on chromosome 3A, which was recently cloned as TaMFT-3A. In addition, the accumulation of the QTLs and their epistatic interactions contributed significantly to a higher level of dormancy. QDor-4A is co-located with the Hooded locus for awn development. Furthermore, an effective QTL, which confers early heading by the Zenkouji-komugi allele, was detected on the short arm of chromosome 7B, where the Vrn-B3 locus is located. Understanding the genetic architecture of traits associated with PHS resistance will facilitate the marker assisted selection to breed new varieties with higher PHS resistance.
authors.affiliation: Obihiro University of Agriculture and Veterinary Medicine , Obihiro, Hokkaido 080-8555 , Japan.
authors.forename: Liangzi
authors.initials: L
authors.lastname: Cao
authors.affiliation: Obihiro University of Agriculture and Veterinary Medicine , Obihiro, Hokkaido 080-8555 , Japan.
authors.forename: Kazuki
authors.initials: K
authors.lastname: Hayashi
authors.affiliation: Obihiro University of Agriculture and Veterinary Medicine , Obihiro, Hokkaido 080-8555 , Japan.
authors.forename: Mayumi
authors.initials: M
authors.lastname: Tokui
authors.affiliation: Obihiro University of Agriculture and Veterinary Medicine , Obihiro, Hokkaido 080-8555 , Japan.
authors.forename: Masahiko
authors.initials: M
authors.lastname: Mori
authors.affiliation: Obihiro University of Agriculture and Veterinary Medicine , Obihiro, Hokkaido 080-8555 , Japan.
authors.forename: Hideho
authors.initials: H
authors.lastname: Miura
authors.affiliation: Obihiro University of Agriculture and Veterinary Medicine , Obihiro, Hokkaido 080-8555 , Japan.
authors.forename: Kazumitsu
authors.initials: K
authors.lastname: Onishi
keywords: awn length; heading time; pre-harvest sprouting; seed dormancy; wheat