Gene effect estimation for yield–characters and inheritance of yellow rust resistance among generations in three bread wheat crosses
Abstract: This study was carried out during 2016/17 to 2019/2020 seasons on the farm of Sakha Agricultural Research Station, ARC, Egypt to investigate the inheritance and nature of genetic control of yellow rust disease and yield traits in bread wheat. Four parental bread wheat genotypes and their F1, F2 and F3 filial generations were evaluated in a randomized complete block design in three replications for three crosses (Shandaweel-1 × Misr-1, Shandaweel-1 × Sakha-95 and Line-2 × Sakha-95). The existence of genetic variability was due to differences among the investigated filial generations for all studied traits except for 100-kernel weight in the 1st hybrid. Scaling test revealed the presence of non-allelic interactions (epistasis) in the most studied cases. Dominance gene effects were generally greater than additive ones in all cases. Gene effects varied among crosses' traits, whereas the dominance and duplicate dominance beside additive gene effects were found to play important role in the inheritance for most studied cases. Therefore, the significantly heterotic effect and over-dominance was detected. Narrow sense heritability estimates displayed moderate values in most cases. Inheritance of resistance to yellow-rust disease among generations was governed by one to three genes, whereas depends on the parental genetic background that affects the genetic interaction of cross. Promising F3 families derived from Shandaweel-1 x Sakha-95 cross recorded the complete dominant tolerant to yellow-rust infection, however Line-2 x Sakha-95 families were promising for grain yield. Selection based on rust infection for individual plants within sixty families recorded 25, 50 and 21 as best families from the three crosses, respectively. Wheat breeders can employ these results to improve both yield and rust-infection and enhance Egyptian wheat genotypes.
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Publication year 2020
Pages 2348 – 7968
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Author(s) from ARC
Publication Type Journal
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