Assessment of genotype x environment interactions for seed cotton yield & quality traits in desi cotton (Gossypium arboreum L.)
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Date
2020-07
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CCSHAU, Hisar
Abstract
The present study comprised of thirty Gossypium arboreum genotypes grown in two locations during the kharif seasons in the year 2016 and 2017 in a randomized block design (RBD) at CCS Haryana Agricultural University, Hisar and cotton research station, Sirsa, CCS Haryana Agricultural University.
The observations on five randomly selected plants from each replication in each environment were recorded for fifteen quantitative and qualitative characters viz., days to first flower, plant height, number of monopods per plant, number of bolls per plant, boll weight (g), ginning out turn (%),seed index (g), lint index (g), lint yield (g), protein (%), oil (%), gossypol (%), sugar (%), seed cotton yield per plant (g). The data were subjected to examine variability parameters, such as coefficient of variation, association among seed cotton yield and component traits and to study stability of various traits, biochemical parameters and genetic diversity also analysed using SSR markers. Seed cotton yield per plant showed highly significant positive correlation with lint yield per plant, number of bolls per plant, boll weight and gossypol content. The path-coefficient analysis suggested the importance of number of bolls per plant, seed index, boll weight, lint yield and number of seeds per boll as they exhibited positive direct effects on seed cotton yield. The estimation of environmental additive effects (Ij) revealed that environment 2 was most suitable for number of monopods per plant, number of bolls per plant and number of seeds per boll. Environment 3 was found favourable for days to first flower, plant height, number of bolls per plant and oil content. Similarly, environment 4 was best for plant height number of seeds per boll, lint yield per plant and seed cotton yield plant. Significant diversity was found among all 30 genotypes even at molecular level. And all 3o genotypes were groups intro 4 clustered by polymorphism information of 22 SSR markers.