Genetic Variability among Egyptian Extra-long Staple Cotton Genotypes for Some Economic Traits

Abstract

T HIS INVESTIGATION was completed at Sakha Station of Agricultural Research, over 2021 and 2022 seasons to evaluate the variance among some Egyptian cotton genotypes for yielding potential and fiber quality traits. Materials comprised thirteen extra-long staple cotton genotypes ( Gossypium barbadense L . ). Genotypes were arranged in RCBD design replicated quadric. Data were collected for, boll weight, seed cotton yield, lint yield, lint%, earliness index, micronaire reading, fiber strength, fiber length and uniformity index. Genotypes (G) exhibited significant differences for all traits. Years (Y) had insignificant differences on most of traits, GxY interaction was significant for some traits. Giza 87 and Giza 88 had the lower yield while the rest of genotypes insignificantly varied. Giza 87, Giza 93 and Giza 93 x Menufi genotypes had the finest fibers, Giza 87, Giza 92 and Giza 96 had the strongest fibers. Genotypic and phenotypic exhibited broad scope of variability for all traits. Seed and lint cotton yields had moderate PCV values, while the remainder traits showed low values, GCV showed moderate value for lint yield and low values for the remainder traits. Broad-sense heritability recorded low value for boll weight to very high values for most of traits. For GS%, moderate values were recorded for seed cotton yield, lint yield and earliness index while the rest had low values. In this investigation, seed cotton yield, lint yield and earliness index exhibited high heritability together with moderate genetic advance values, subsequently, direct selection for such traits is anticipated to induce considerable improvement in next generation.