Exploring Genetic Variability and Heritability for Strategic Parent Selection in Sunflower (Helianthus annuus L.) Breeding Cytoplasmic Male Sterility, Maintainer and Restorer Fertility Lines | ||||
| Labyrinth: Fayoum Journal of Science and Interdisciplinary Studies | ||||
| Articles in Press, Accepted Manuscript, Available Online from 15 June 2025 PDF (1.52 MB) | ||||
| Document Type: Review articles (should cover a part of the subject of active current interest) | ||||
| DOI: 10.21608/ifjsis.2025.382796.1115 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Kamal Hassan Ghallab   1; Ali Abdallah Ali Mekdad 2; Fangary S Sedik3; Heba ME Abd ELwahed3
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| 1Agronomy, Faculty of Agriculture, Fayoum University | ||||
| 2Fayoum University, Faculty of Agriculture, Agronomy Department | ||||
| 3RCA | ||||
| Abstract | ||||
| The objective of this study was to evaluate the line × tester mating design for combining ability regarding yield and its components in sunflower, focusing on six cytoplasmic male sterile (A-lines), their respective maintainer lines (B-lines), and four restorer fertility lines (Rf-lines) used as testers. Evaluations were conducted over two consecutive summer seasons (2021 and 2022), on significant agronomic traits such as the 50% flowering date, physiological maturity, plant height, head diameter, seed yield per plant, and percentage oil content. Analysis of variance among A, B, and Rf-lines showed significant differences, indicating adequate genetic variability to support effective selection. Genotypic and phenotypic variances and heritability and genetic advance were estimated. Additive gene action was indicated by high heritability and high genetic advance for plant height and seed yield in A-lines, physiological maturity and seed yield in B-lines, and for all the traits in Rf-lines. On the other hand, traits such as head diameter with high heritability and low genetic progress reflected non-additive gene action. Interestingly, genotypes A7, B7, and Rf-10 exhibited a positive correlation of seed yield and oil content which disrupted the typical negative relationship. The high genotypic correlation of yield component traits-most prominently in Rf-lines-emphasizes the viability of double improvement through indirect selection. Despite some environmental influence, as evidenced by higher phenotypic than genotypic variation, the findings underscore the reliability of selection based on these agronomic traits. | ||||
| Keywords | ||||
| CMS; Maintenance; Restorer; Genetic variability; correlation | ||||
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