Bulgarian Journal of Agricultural Science
Array ( [session_started] => 1751193128 [LANGUAGE] => EN [LEPTON_SESSION] => 1 [PAGE_ID] => 107 )
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Phenotypic stability of new cotton lines (Gossypium hirsutum L.)
Valentina Dimitrovaorcid, Minka Kolevaorcid
Abstract: The genotype × environment interaction and stability of 24 advanced cotton lines and the standard cultivar Chirpan-539 were studied during 2019-2021. The years of study appeared to be different ecological environments. To evaluate the stability, different stability methods were used: the stability variances (2i, S2i) of Shukla (1972), the ecovalence (W2i) of Wricke (1962) and the parameter YSi of Kang (1993). The regression coefficient (bi) and the deviation from regression (S2di) (Eberhart & Russel, 1966) were calculated only for seed cotton yield. A cluster analysis was applied to group the genotypes by phenotypic stability for the studied traits. It was found that the tested cotton genotypes significantly interacted with the environmental (years) conditions in terms of seed cotton yield, boll weigt, fiber length and lint persentage, which required their stability to be studied. Given the estimates of the parameter YSi and the overall performance based on the variantces 2i and S2i, and the ecovalence W2i, the most valuable lines for the selection programs with cotton were: for seed cotton yield - 678 and 654, combining yield and stability expressed by regression and variance methods, 705 and 724, with high YSi scores due to high yields, 692, responsive to favorable environments; for boll weight - 701, 581 and 678; for lint percentage - 661, 663 and 718 and for fiber length – 724, 721 and 583, showed high average level and high stability for the relevant traits. Complex breeding value, high average level and stability, for two traits simultaneously was found in lines: 678 - for seed cotton yield and boll weight; 701 - for boll weight and lint percentage; 581 - for boll weight and fiber length. Cluster analysis very well groups genotypes by phenotypic stability and contributes to their more efficient use in breeding programs. The lines distinguished as most valuable based on the analysis of research results, formed independent smaller groups.
Keywords: cotton; economic traits; G. hirsutum L.; genotype-environment interaction; new lines; phenotypic stability
Citation: Dimitrova, V. & Koleva, M. (2025). Phenotypic stability of new cotton lines (Gossypium hirsutum L.). Bulg. J. Agric. Sci., 31(3), 531–544.
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Date published: 2025-06-24
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