Genetic architecture of F2 and identified transgressive segregants for yield and its component traits in bread wheat (Triticum aestivum L.)
Two crosses of bread wheat viz., K 1006 x LOK 1 and PBW 343 x HUW 234 were investigated to explore the useful variability parameters, correlation along with inheritance study (skewness and kurtosis) in the segregating F2 and F3 population for yield and its component traits respectively. Narrow difference between phenotype and genotype coefficient of variation showed less influence of environment on expression of traits under investigation. High heritability coupled with high genetic advance as per cent of mean (GAM) were registered in F2 segregants of both crosses for majority of the characters. Among identified transgressive segregants it was higher for most of the traits like Grain filling duration (GFD), Spike length (SPL), Awn length (AL), Peduncle length (PL), Plant height (PLH), No. of spikelet’s per spike (SLPS), Net effective tiller (NET), and Area under SPAD decline curve (AUSDC) in F3 generation depicting the predominance of additive gene action, followed by selection along with progeny testing that can be utilized for improving of these traits. Significance of mean sum of square for traits under study among identified transgressive segregants indicated the presence of adequate amount of genetic variability among the plants. Grain yield plant-1 showed significant and positive correlation with NET, SPL, PLH, SLPS, GPS in F2 segregants of both the crosses revealed that selection for these traits leads to increase in overall productivity of the crop. Inheritance study revealed that traits with a negatively skewed Platykurtic distribution (1000 grain weight, AL, NET, PLH, PL, DM, GFD and AUSDC) were governed by many genes exhibiting dominant and dominant based duplicate epistasis in F2 population. Similarly, positively skewed Platykurtic distribution for traits like GYPP, GPS, SLPS, SPL, NET, DF in F2 population suggested the presence of large number of genes showing dominant and dominant based complementary epistasis. Hence, intense selection is required for rapid genetic gain. Inheritance studies are more powerful than first and second-degree statistics which disclosed interaction genetic effects.
Keywords: Wheat, Skewness, Kurtosis, Transgressive Segregants, Variation, Correlation.
Genetic architecture of F2 and identified transgressive segregants for yield and its component traits in bread wheat Triticum aestivum L.. 2023. Electronic Journal of Plant Breeding, 14 2, 551-560. Retrieved from https://ejplantbreeding.org/index.php/EJPB/article/view/4571
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