Stability analysis of seed cotton yield and its components of Gossypium barbadense genotypes.

摘要

In India, among four cultivated cotton species, G. barbadense is important species for fibre quality which is the only source for production of extra long staple (ELS) cotton. The mill requirement for extra long staple cotton is 20 lakh bales but the production is only five lakh bales. Hence to increase extra long staple cotton production, area under inter specific hybrids (G. hirsutum x G. barbadense) should be increased. This study was carried out to identify stable G. barbadense accession so as to develop high yielding H x B hybrids. Forty one G. barbadense accessions were tested under three seasons at Coimbatore, Tamil Nadu. The Eberhart and Russell model (1966) of stability analysis was carried out to study the genotype x environment interaction for seed cotton yield and its component traits. The variance due to genotypes, environments, genotypes x environments and environments (linear) were significant for all the characters. The present investigation revealed that the barbadense genotypes viz., Barbados, 6002-1 and Giza 70 and 17/3A had regression coefficient around unity and least deviation from regression and thus appeared to exhibit good stability with more responsiveness over environments for the characters viz., seed cotton yield, lint yield, ginning outturn (%), boll weight and number of bolls per plant. Hence, these genotypes were highly adaptable and suitable for cultivation over a wide range of agro climatic conditions for the characters under study. Hence, these genotypes can be utilized as parental lines in the development of H x B hybrids.