Impact of genotype x environment interaction and stability for seed cotton yield and its component traits in Asiatic cotton (Gossypium arboreum L.)

摘要

Stability analysis helps in understanding the adaptability of genotypes over different environmental conditions and the identification of adaptable genotypes. To study the magnitude and nature of genotype * environment interaction and to determine stability of yield potentiality in Asiatic cotton was carried out in three different date of sowings (Early, normal and late) during fchan/seasons of 2015 and 2016. Significant differences were observed among the genotypes and environments for seed cotton yield / plant, lint yield / plant, seed index, lint index, ginning outturn, seeds / boll, boll weight, bolls / plant, monopods / plant, plant height, days to boll bursting and days to first flower indicating presence of variability among genotypes and environments. Mean square due to genotypes x environment (linear) were significant for all the characters indicating the preponderance of linear component of G x E interaction than non linear component hence prediction is possible. The cotton varieties HD 123 and HD 432 were recorded high mean with regression coefficient (b.) near unity and non significant deviation from regression (S2d.) for seed cotton yield / plant, lint yield / plant and monopods / plant indicated that these genotypes had average response and high stability over the environments. The estimation of environmental additive effect (Ij) estimates revealed that environment 4 was best for seed cotton yield (g/plant) and lint yield (g/plant). Hence ex/ imental finding suggests the suitabilityof genotypes and environmental conditions for the exploitation of different traits of cotton to varying conditions.