QTL alleles from a winter feed type can improve malting quality in barley

Abstract

Mapping quantitative trait loci (QTLs) responsible for malting quality traits in barley populations has been the main genetic approach to malting quality breeding. A Ôwinter · springÕ doubled haploid barley population ÔNureÕ · ÔTremoisÕ, where such traits were segregating, has been recently developed. Our objective was to map QTLs for malting quality from 2 years of trials in two contrasting locations. QTLs were found on six chromosomes, with a main cluster on chromosome 1H. For wort viscosity and malt extract, favourable alleles at two loci on chromosome 5H were carried by the winter feeding parent ÔNureÕ. Doubled-haploids with higher quality than the spring malting cultivar ÔTremoisÕ showed either a facultative or a winter growth habit and a level of frost tolerance comparable with that of the winter tolerant parent ÔNureÕ. Markers and QTLs of quality traits were further validated on a separate set of DH lines, coming from the same cross, by means of marker-assisted selection. This showed that, at least in the present cross combination, positive contributions to malting quality can be found in winter feed barley.

Genotype, environment and G × E interaction influence (1,3;1,4)‐β‐d‐glucan fine structure in barley (Hordeum vulgare L.)

“…DP3:DP4 ratio was associated with two different genomic regions on chromosome 7H (Bmac273e) and 1H (Bmac504 and Bmac211). The identified region on chromosome 1H had been shown to be a pleiotropic QTL controlling acrospire growth, grain β‐glucan concentration and wort viscosity . A putative candidate gene identified in a syntenous region in rice, Os05g01020 , is thought to interact with the histone deacetylase complex (HDAC), thereby controlling chromosome methylation and gene expression …”

Structural and Temporal Variation in Genetic Diversity of European Spring Two‐Row Barley Cultivars and Association Mapping of Quantitative Traits

“…Such regional drops in genetic diversity presumably derive from human selection and reflect the targets of modern barley breeding. For example, several QTL and candidate genes (e.g., HvCslF9 and HvGlb1 ) for malting quality traits have been mapped to the low PIC value pericentromeric region of chromosome 1H (47.5–50.9 cM) (Burton et al, 2008; Laidò et al, 2009). We also identified several regions with lower PIC values in old cultivars on all chromosomes.…”

A major QTL on chromosome 7HS controls the response of barley seedling to salt stress in the Nure × Tremois population

“…The genetic distances, different growth habits and different seed usages of Nure (winter feeding barley) and Tremois (spring malting barley) make the corresponding segregating population an ideal tool for the genetic dissection of many agronomic traits, e.g., frost tolerance, malting quality, yield and yield components [ 41 – 45 ]. In addition to the successes in these traits, a preliminary experiment also highlighted the differing seedling growth capacities of Nure and Tremois under salt stress, presenting an aspect for the genetic analysis of loci controlling salt tolerance at seedling stage.…”

“…4 ). Nevertheless, the NT population has been previously exploited for studying the genetic bases of malting quality, and no QTLs were detected on chromosome 7H [ 45 ]. A correlation analysis between malting quality data [ 45 ] and RL data under salt stress did not show any significant results (data not shown).…”

“…The barley Nure × Tremois (NT) double-haploid (DH) population has been successfully exploited for mapping complex traits, including frost tolerance [ 41 , 42 ], yield adaptation [ 43 , 44 ] and malting quality [ 45 ]. Given that Nure and Tremois differ in terms of seedling growth capacity under salt conditions, the NT population was employed to search for the loci determining salt tolerance at the seedling stage.…”