Mapping of quantitative trait loci determining agronomic important characters in hexaploid wheat (Triticum aestivum L.)

Abstract

A set of 114 recombinant inbred lines of the 'International Triticeae Mapping Initiative' mapping population was grown during the seasons 1997, 1998, 1999 and 2000 under several environments. Twenty morphological (glume colour, awn colour, waxiness, leaf erectness, peduncle length), agronomical (ear emergence time, flowering time, grain filling time, ear length, plant height, lodging, grain number, thousand-grain-weight, grain weight per ear, grain protein content, winter hardiness) and disease resistance (powdery mildew, yellow rust, leaf rust, fusarium) traits were studied. Not all traits were scored in each experiment. In total 210 QTLs with a LOD threshold of >2.0 (minor QTLs) were detected of which 64 reached a LOD score of >3.0 (major QTLs). Often QTLs were detected in comparable positions in different experiments. Homologous and homoeologous relationships of the detected QTLs, and already described major genes or QTLs determining the same traits in wheat or other Triticeae members, are discussed.

Estimation of genetic parameters and prediction of breeding values for apple fruit-quality traits using pedigreed plant material in Europe

“…The number of powdery mildew resistance QTL detected in the RE714 9 'Hardi' RIL population is lower than what was obtained by Keller et al (1999) (18 QTL with a LOD score higher than 3.0) or by Bougot et al (2006) (11 QTL, LOD [ 3.2), but is higher than what was obtained by Liang et al (2006) (4 QTL, LOD [ 2.5) or by Börner et al (2002) (3 QTL, LOD [ 3.0) (see Table 5). These differences can be explained by differences in the genetic background of the wheat population analysed leading to differences in polymorphism at powdery mildew resistance QTL and in composition of the powdery mildew population.…”

“…No major gene has been described in the region of QPm.inra-6A2 in wheat for the moment. However, a minor QTL for powdery mildew resistance was detected in one environment, with a LOD score between two and three, in the ITMI population by Börner et al (2002) in a genomic localization similar to the QTL QPm.inra-6A2 (Table 5). On chromosome 5D, the QTL detected in this study and at the seedling stage (Muranty et al 2008.…”

“…During the past 10 years, several studies on the genetic control of APR to powdery mildew were carried out in several wheat lines, including the Swiss cultivar Forno , the US' cultivar Massey and its derivatives (Liu et al 2001;Tucker et al 2006), the spring variety Opata 85 and the synthetic wheat W7984 (Börner et al 2002), the French breeder lines RE714 (Chantret et al 2001;Mingeot et al 2002) and RE9001 (Bougot et al 2006), the Japanese cultivar Fukuho-komugi (Liang et al 2006), a T. militinae introgression line (Jakobson et al 2006) and the CYMMIT cultivar Saar (Lillemo et al 2008). In these studies, 3-18 QTL were identified, among which between one and three were consistent across environments.…”

QTL Positioning of Thousand Wheat Grain Weight in Qaidam Basin

“…Nelson and the like positioned Lr10, Lr23, Lr27 and Lr31 in chromosomes 1AS, 2BS, 3BS and 4BL respectively [12]. In the aspect of TGW, Borner took use of an ITMI population and obtained 3 stable QTL loci in 3AS, 5AL and 6BS [11], though they failed to be testified in the research of this paper. But in the QTL analysis of genealogy BC2F3 resulting from cross-breeding between female parent W7984 and "Prinz", Huang and the like acquired QTgw.ipk-4D, QTgw.ipk-5B, QTgw.ipk-7A, QTgw.ipk-7B.1, QTgw.ipk-7B.2, QTgw.ipk-7D [13].…”

“…Besides, there existed an epistatic effect between 1AS and 2DL [10]. Gene Pm15 with Blumeria graminis was positioned in 7D and 4B, gene Lr34 in 7D, and glutenin gene Gpc in 7A [11]. Nelson and the like positioned Lr10, Lr23, Lr27 and Lr31 in chromosomes 1AS, 2BS, 3BS and 4BL respectively [12].…”