Inheritance pattern of earliness and yield traits in half diallel crosses of spring wheat

Abstract

A half-diallel mating system was used to evaluate six wheat cultivars and their F 1 and F 2 populations for inheritance of earliness and morphological and yield traits. These genotypes were crossed in a half-diallel fashion during 2010-2011 to get 15 cross combinations. The 6 × 6 wheat F 1 and F 2 half-diallel populations and their parental cultivars were assessed in a randomized complete block design during 2011-2012 and 2012-2013, respectively. Genotypes revealed significant (P ≤ 0.01) differences for all the traits in both generations. According to scaling tests, an additive-dominance model was partially adequate for all the traits in the F 1 and F 2 generations. Diallel analysis revealed significant values for additive (D) and dominance (H 1 and H 2) genetic components of variance for majority traits in both generations, however, the overdominance type of gene action was predominant for inheritance. Additive gene action was observed for days to heading and plant height in the F 1 generation and tiller per plant and grain yield per plant in the F 2 generation. In the loci (H 2 < H 1), the majority of the traits showed an unequal proportion of positive and negative genes with asymmetrical distribution among parental genotypes (H 2 /4H 1 < 0.25). Significance of both additive and nonadditive genetic variations suggested integrated breeding strategies with delayed selection for improvement in wheat populations.

Selection for high yield and quality in half-diallel bread wheat F2 populations (Triticum aestivum L.) through heterosis and combining ability analysis

“…Aldane cultivar showed significant GCA effects for grain quality traits such as TGW, GI, ZSV, QI and GPC, while these effects were negative for grain yield traits other than PH. Parental genotypes with desirable GCA effects are considered to be the best parental genotypes and good general combiners that can be exploited to improve the trait in wheat breeding (Afridi et al, 2017;Parveen et al, 2019). These results show that Esperia and Pehlivan varieties were found to be good combiners, while Selimiye and Flamura85 were average and Saraybosna, Aldane and Fs were poor combiners to increase grain yield.…”

Combining Ability for Earliness, Grain Yield and Its Components in Some Bread Wheat Genotypes Under the Normal and Late Sowing Dates

“…Thus, the results provide evidence for the presence of adequate amount of genetic variability valid for further biometrical assessments. In this respect, significant differences were detected among wheat parents and F 1 crosses for earliness and yield characters by many investigators (Gashaw et al, 2007;Anwar et al, 2009;El-Moselhy, 2009;Sedek, 2009;Rizkalla et al, 2012;Abdallah et al, 2015;Kumar et al, 2015;Ahmad et al, 2016;Hassan et al, 2016;Khan, 2016;Afridi et al, 2017;Kumar et al, 2017;Qabil, 2017).…”

Assessment of Nitrogen Retention From Maize Crop and Wetland Ditch Plants Residues by Vermicomposting

“…Flag leaf area potentially contributes to grain filling by translocation of carbohydrates in grains during the post-anthesis period in wheat (Sattar et al, 2018). In wheat crop, flag leaf contributes to spike development, grain filling, and grain yield (Aslam et al, 2014;Afridi et al, 2017a). Wheat genotypes with greater tillering capacity are more preferable.…”