Quantitative Trait Loci Controlling Agronomic Traits in Recombinant Inbred Lines from a Cross of Oriental- and Occidental-type Barley Cultivars

Abstract

A total of 99 recombinant inbred lines (RILs) generated from a cross between Oriental 'Azumamugi' and Occidental type 'Kanto Nakate Gold' of barley Hordeum vulgare L. cultivars were grown over a period of two years to identify quantitative trait loci (QTLs) controlling agronomic traits such as days to heading, spike characters (length, internode length, awn length and triplet number) and culm internode length. The RILs showed a wide range of variations for all the agronomic traits tested. Composite interval mapping (CIM) enabled to identify a new QTL with a major effect on rachis internode length on chromosome 2HL (qSIL.ak-2H) which was closely linked to the cleistogamy genes and Fusarium head blight resistance QTL. A new QTL for culm length was detected on chromosome 7HL (qCUL.ak-7H), which controlled the elongation, particularly that of the lower culm internodes. The dense spike 1 (dsp1) locus was precisely mapped on a molecular linkage map of chromosome 7HS. The dsp1 locus controlled only the lower culm internode length, while the uzu1 locus controlled the whole culm length. The positions of the QTLs detected in the present study were compared with those of previously reported genes.

Detection of photoperiod responsive and non-responsive flowering time QTL in barley

“…We have shown earlier (Sameri et al 2006(Sameri et al , 2009) that the QTL lying close to ABC261 on chromosome arm 1HL is likely to be eam8, as identified by Takahashi and Yasuda (1970) (Table 1). This locus here was one of the major determinants of flowering time under a wide range of photoperiod treatments.…”

“…Azumamugi is a Japanese cultivar with characteristics of typical oriental-type cultivars (Sameri et al 2006).…”

“…The control of flowering time is central for the reproductive success of plants and has a major impact on grain yield (Cockram et al 2007, Sameri et al 2006, Sameri and Komatsuda 2007. Flowering is often restricted to a particular time of year.…”

Molecular detection of QTL controlling plant height components in a doubled haploid barley population

“…In addition to the semi-dwarfing and dwarfing genes, a number of quantitative trait loci (QTL) are also known to affect plant height in barley. QTL conferring plant height are reported to be located on all seven chromosomes (Backes et al, 1995;Kjaer et al, 1995;Hori et al, 2003;Pillen et al, 2003;Sameri et al, 2006;von Korff et al, 2006;Baghizadeh et al, 2007;Wang et al, 2010).…”

Barley and Wheat Share the Same Gene Controlling the Short Basic Vegetative Period

“…Franckowiak and Konishi (2002) identified the Eam6 locus on chromosome 2HS, which might be synonymous with the eps2 locus identified by Laurie et al (1995). Recently, a QTL on chromosome 1H was located at the interval between ABC261 and ABG055 markers controlling heading time from the Azumamugi (JP17209)  Kanto RIL population, which is supposedly closely linked or allelic to eam8 (Sameri and Komatsuda 2004;Sameri et al 2006). However, comparing our mapping results with the barley consensus map, ABC261 and ABG055 markers were not entirely consistent with the BVP-1 gene closely-linked markers in this study.…”