Use of Graphical and Numerical Approaches for Diallel Analysis of Grain Yield and Its Attributes in Bread Wheat (Triticum aestivum L.) under Varying Environmental Conditions

Improving yield is the main aim of plant breeders. In case bread wheat (Triticum aestivum), a major challenge in this regard genotype–environment interactions, and knowledge these required to successfully select high-yielding genotypes. study, graphical numerical approaches diallel analysis have been used reveal such interactions. Ten different genotypes were crossed using half-diallel approach. The parents, hybrids, standard checks evaluated at Regional Research Station, Anand Agricultural University, Gujarat, Anand, India under both late-sown conditions two separate years (E1 E2 (normal-18 November 2018 late sown-10 December 2018, respectively, Rabi 2018–2019), E3 E4 2019 2019, 2019–2020)). For each sowing, ‘t2’ values calculated for eleven phenotypic characteristics: days 50% heading, maturity, height, number effective tillers per plant, length stem, spikelets spike, grains grain 1000-grain weight, harvest index. Components gene effect revealed that spike E4, governed by additive dominance action across environments. Other characteristics greater influence effect, except heading E1, E2, E3, E4; maturity E4. Many exhibited overdominance, an asymmetrical distribution positive–negative, dominance–recessive genes, narrow-sense heritability all analysis, regression value ‘b’ was unity E4) weight (E3 E4), which absence digenic interactions respective Therefore, given population may be improved isolate superior recombinants development desired parents future breeding programs.