How Does the Strength of Selection Influence Genotypic Matrix, Path-Analysis and Sensitivity to Environments?

Hasan, Heba A. A. M.; Mahmoud, Adel M.; Abdel-Azeez, Ghada B.; Mahdy, Ezzat E.

doi:10.21608/ajas.2025.345859.1441

	How Does the Strength of Selection Influence Genotypic Matrix, Path-Analysis and Sensitivity to Environments?
Assiut Journal of Agricultural Sciences
Article 2, Volume 56, Issue 2, April 2025, Page 18-34 PDF (586.53 K)
Document Type: Original Article
DOI: 10.21608/ajas.2025.345859.1441
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Authors
Heba A. A. M. Hasan¹; Adel M. Mahmoud²; Ghada B. Abdel-Azeez¹; Ezzat E. Mahdy ²
¹Oil Crops Department, Field Crop Research Institute, Agricultural Research Center, Giza, Egypt.
²Department of Agronomy, Faculty of Agriculture, Assiut University, Assiut, Egypt.
Abstract
Three cycles of pedigree selection started in the F2 were conducted during the four summer seasons of 2020 to 2023 to study the effect of single and multiple trait selection on the genotypic matrix, path analysis and sensitivity of the selected families of sesame to environments. The experiments were carried out at reclaimed loamy sand soil. The third cycle was evaluated in the reclaimed and clay soils. The genotypic correlations among traits differed for all types of selection in the two sites of evaluation. The direct and indirect effects of seed yield components in the single and multiple trait selection suggest the use of selection indices rather than single trait selection to improve seed yield in sesame. The performance of the selected families was higher in clay than in reclaimed soil. However, eight families (No. 273, 275, 355, 408, 604, 665, 692 and 764) were higher in seed yield (SY/P) in reclaimed compared to clay soil, three of them (No.273, 604 and 692) yielded higher in reclaimed than the average in clay soil. Such families can be considered promising families for inclusion in a breeding program to produce sesame strains that thrive in newly reclaimed soil. The correlation between the family’s performance in reclaimed and clay soils reached 0.76 indicating that the performance in SY/P mostly controlled by the same genes. But there may be genes that affect performance that differ from one location to another, especially in the families that outperformed in reclaimed compared to clay soil.
Keywords
Path-analysis; Selection index; Sensitivity to environment; Sesamum indicum L; Single trait selection


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