LINE X TESTER ANALYSIS FOR GRAIN YIELD AND QUALITY TRAITS IN RICE (Oryza sativa L.) | ||
| Egyptian Journal of Plant Breeding | ||
| Article 3, Volume 25, Issue 1, June 2021, Pages 25-45 PDF (1.06 M) | ||
| Document Type: Original research | ||
| DOI: 10.12816/ejpb.2022.220548 | ||
| Abstract | ||
| Eight rice genotypes (five commercial varieties as lines and three exotic varieties as testers with different in yield, yield component and grain quality traits were provided from the genetic stock of the Rice Research and Training Center. These genotypes were planted during 2019 growing season. At heading the crosses among lines and testers were done. All the five lines, three testers and their fifteen crosses were grown during 2020. The experiment was carried out using a randomized completely block design with three replications. The data were recorded on plant height, number of panicles/hill, panicle weight, number of filled grains/panicle,sterility%, 1000-grain weight,grain yield/plant and quality characters. Heterosis was estimated and t-test was performed. Combining ability analysis was performed using line x tester method. The results showed significant variation for all characters among the lines and testers. The mean squares showed highly significant differences among parents and their crosses for studied traits. The tester Millyang 97 was good general combiner for yield, while Hexi 12 was good general combiner forhead rice and amylose content%. The crosses Giza 179x Milyang 97, Sakha 104x Hexi 12 and E. Yasmine x Hexi 12 were observed as good specific combiners for yield/plant. The cross Giza 179x Milyang 97was good specific combiner for panicle weight, 1000-grains weight and grain yield but the crosses Giza 178x Tongil and Giza 181x Milyang 97were good specific combiners for head rice%, lines played important role towards panicle weight, number of filled grains/panicle, sterility%, grain yield, grain length,grain shape, hulling%, milling rice% and head rice% indicating predominant maternal influence for these traits. Line × tester interaction contributed to combinations of variances for number of panicles/plant and1000-grains weight. The genetic components of that characters exhibited a non additive variance.Significant and desirable heterosis was observed in twelve crosses over better parent but the maximum value was shown by Giza 178x Milyang 97 followed by Giza178x Hexi 12 .All crosses recorded significant and positive for mid parent heterosis for grain yield per plant.But only Giza 181x Milyang 97 cross recorded high heterobeltiosis (6.46%) and relative heterosis (4.82%) for head rice recovery. | ||
| Keywords | ||
| Rice: Combining ability; Genetic parameters; Heterosis | ||
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