Assessment of combining ability and gene action for grain yield and its component traits in pearl millet [Pennisetum glaucum (L.) R. Br.] Rasitha R.1, Kalaiyarasi R.2,*, Iyanar K.1, Senthil N.3, Johnson I.1, Sujitha R.1 1Department of Millets, CPBG, TNAU, Coimbatore 2Department of Oilseeds, CPBG, TNAU, Coimbatore 3Centre for Plant Biotechnology and Molecular Biology, TNAU, Coimbatore *E-Mail: kalaiyarasir@tnau.ac.in
Online Published on 22 January, 2024. Abstract The current study involved the evaluation of 96 pearl millet hybrids synthesized by crossing eight lines with 12 testers using a Line x Tester mating design. The experiment was conducted during the Kharif season of 2022 with two replications and included standard checks COH10 and 86M38. Analysis of variance for combining ability revealed that, significant amount of variation was present in all hybrids for studied traits. The contribution of lines to the total variance in hybrid was greater than tester. The ratio between GCA and SCA variance was less than one for all traits and it showed that non additive gene action was predominant and highlighting the potential of heterosis breeding to exploit hybrid vigor. Among the parents, ICMB 02777 and PT 6679 were identified as good combiners, showing positive gca effects and high mean performance for grain yield, test weight, single earhead weight, and single earhead threshed weight. The other parents viz., ICMB 02444, ICMB 93222, PT 6067, and PT 6476 were also recognized as good combiners for grain yield. Out of the 96 hybrids, the cross ICMB 02777 x PT 6679 exhibited significant positive heterosis along with high standard heterosis over both checks for grain yield, test weight and single earhead threshed weight. Additionally, the crosses ICMB 02444 x PT 6679, ICMB 93222 x PT 6067 also recorded significant sca effect for grain yield per plant. These promising hybrid combinations hold great potential for heterosis breeding programs and may be suitable for commercial exploitation after thorough evaluation under multi-location trials. Top Keywords Pearl millet, Combining ability, Heterosis, GCA, SCA. Top |