Abstract:

Molecular tagging of QTLs for yield and its components is a base of great significant to MAS for high yield breeding in cotton. Simian 3 have been one of the cotton cultivars most extensively grown in Yangtze River cotton-growing valley with high yield and high lint percentage, while Carmen is a Spanish cotton cultivar. QTL tagging of yield and its components in the RIL population from a cross between Simian 3×Carmen were conducted using 65 SSR markers having polymorphism between parents screened from a total of 2 523 pairs of SSR primers. The results showed that 1 QTL for fruit nodes per plant and 1 for boll size, 2 for seed index, 1 for lint index and 1 for seed-cotton weight of 100 seeds were detected in RIL population acress more than two environments based on composite interval mapping and marker multiple regression methods. Using the method of single-marker analysis, 17 QTLs controlling the yield and its components were screened in more than two environments. The molecular markers tightly linked with the QTLs controlling high yield and its components in this paper can be used for MAS in high-yield breeding program.

Key words: Yield traits, QTLs, Molecular marker, Upland cotton