The present study was conducted to estimate the gentic components and regression analysis for grain yield and various morphological traits in bread wheat involving 10 parents and their 45 F1s (half diallel) during 2012- 13 and 2013-14. Significant additive (D) and dominance (H1) variance for the traits indicated that expression of these traits is control by both additive and dominance gene action. Average degree of dominance (H1/D)1/2 were more than unity for the traits (peduncle length, flag leaf area, productive tillers, biological yield, grain yield, harvest index) indicating the preponderance of over dominance gene action. The estimates of h2 were positive and significant for days to ear emergence, peduncle length, productive tillers, biological yield and grain yield indicated dominance of genetic components in F1s. Positive and significant values of F were estimated for days to ear emergence, days to 50% flowering, spike length, flag leaf area and grain yield in F1s indicating the preponderance of dominance and positive genes in the parents involved. The theoretical value (0.25) of (H2/4H1) for all the traits indicated asymmetrical distribution of positive and negative genes. The proportion of dominant and recessive alleles indicated presence of dominant alleles in the parents. The traits showing more than 30% narrow sanse heritability could be rewarding for further improvement in grain yield in bread wheat. Regression analysis indicated that the traits (days to ear emergence, days to 50% flowering, peduncle length, flag leaf area, productive tillers, harvest index, biological yield and grain yield) control by over dominance type of gene action. The parent RAJ 4246 contained maximum dominant genes for days to ear emergence and days to 50% flowering; HD 2733 for spike length and flag leaf area and HD 2824 for productive tillers, biological yield and grain yield used as donors in multiple traits breeding programme to develop high yielding wheat genotypes.
Bread wheat, Diallel analysis, Genetic components, Grain yield, Regression analysis
Dere, S. and Yildirim, M.B. (2006). Inheritance of plant height, tiller number per plant, spike height and 1000-kernel weight in a 8×8 diallel cross population of bread wheat. Cereal Research Communications, 34 (2&3): 965-72.
Dayal, L.S, Sastry, E.V.D. and Jakhar, M.L.(2003). Genetic architecture of yield and its component traits in bread wheat (Triticumaestivum L.) grown under saline and normal environments. Indian Journal of Genetics and Plant Breeding, 63 (4): 335-6.
Hayman, B.I. (1954). The theory and analysis of diallelcrosses.Genetics, 39 (6):789-809.
Kumar, D., Kerkhi, S.A., Singh, G. and Singh, J.B. (2015). Estimates of genetic parameters for grain yield, agro-morphological traits and quality attributes in bread wheat (Triticum aestivum). Indian Journal of Agricultural Sciences, 85 (5): 622-7.
Kumar Pradeep, Singh Gyanendra, Singh Devi and Sirohi Anil. (2016a). Genetic architecture of various agromorphological and some quality traits in bread wheat (Triticum aestivum L). Indian Journal of Agricultural Science, 86 (12): 1530-35.
Kumar Pradeep, Nagar, S.S., Singh, Y.P., Abhishek, D. and Kumar, R. (2016b). Study of gene action for yield components and gluten content in bread wheat (Triticum aestivum L.).Ecology, Environment & Conservation, 22(2): 703-709.
Kumar, D., Kerkhi, S.A., Singh Y.P., and Bind, H. (2016c). Regression analysis for yield components and quality traits in wheat. Journal of Wheat Research, 8(1): 25-29.
Mather, K. and Jinks, J.L. (1982). Biometrical Genetics: The Study of Continuous Variation. Chapman and Hall Inc., London.
Panse, V.G. and Sukhatme, P.V. (1967).Statistical Methods of Agricultural Workers. 2ndEndorsement, ICAR Publication, New Delhi, India, pp: 381.
Singh Gyanendra, Tyagi, B.S., Singh, G.P., Chatrath,R., Singh, D.P. and Jag Shoran. (2008). Genetic analysis and association of spot blotch resistance caused by Bipolaris sorokiniana with morphological and yield attributes in bread wheat (Triticum aestivum L.). Indian Journal of Agricultural Sciences, 78 (11) : 957-961.
Singh, H., Sharma, S.N., Saini, R.S. and Singhania, D.L. (2003).The inheritance of production traits in bread wheat by diallel analysis.SABRAO Journal of Breeding and Genetics, 35 (1): 1–9.
Singh, M.K., Sharma, P.K., Tyagi, B.S. and Singh, G. (2014).Combining ability analysis for yield and protein content in bread wheat (TriticumaestivumL.).Indian Journal of Agricultural Sciences, 84 (3): 328–36.
Singh, V., Krishna, R., Singh, L. and Singh, S.(2012). Analysis of yield traits regarding variability, selection parameters and their implication for genetic improvement in wheat (Triticum aestivum L.). SABRAO Journal of Breeding and Genetics 44(2)
This work is licensed under Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) © Author (s)