Effectiveness of selection under different mating systems for the improvement of protein content in wheat (Triticum aestivum L. em Thell.)

Abstract

The effectiveness of selection for the improvement of protein content under random intermating (recurrent selection) and selfing series (pedigree selection) was evaluated in a cross of winter and spring wheats, 'Atlas 66' × 'HD 1977'. Selection of 10 per cent high protein families resulted in an increase of 3.25 per cent and 4.30 per cent of the mean of checks through pedigree and recurrent selection, respectively. The mean protein differences in both methods were not significant. The increase in protein content was accompanied by a decrease in the grains per spike, grain yield and 1000-kernel weight, and the decline was relatively higher in recurrently selected than pedigreed population. Since the pedigree method is simple, less time consuming, economically cheaper, has favourable shifts in association and better correlated responses, it was decided to follow a few cycles of pedigree selection in early segregating generations, after which one or two cycles of recurrent selection in the elite lines could be introduced to increase genetic variation and concentrate favourable genes for grain yield.

Genetic Mapping of Quantitative Trait Loci for Yield-Affecting Traits in a Barley Doubled Haploid Population Derived from Clipper × Sahara 3771

“…In another study, 16 QTLs associated with 3 morphological traits including flag leaf area, flag leaf length (FLL), and flag leaf width were identified in 2 years, which were located on chromosomes 2H, 3H, 4H, and 7H, respectively (Liu et al, 2015). Thousand kernel weight associated with directly the GY and quality of cereal crops, also with affecting on seedling vigor and growth, can indirectly affect GY (Wiersma et al, 2001; Botwright et al, 2002). …”