Stability of parents and their F1 populations of tossa jute under different environments
Nine tossa jute parents and their 36 F1’s produced through 9 x 9 half diallel cross, were raised in five environments (five different dates of sowing) viz. 11th, 18th and 25th April and 2th and 9th May, 2012, in a randomized block design with three replications. The nine parents along with their 36 F1’s were evaluated for fibre yield and quality traits at the Instructional Farm of Uttar Banga Krishi Viswavidyalaya, Pundibari, Cooch Behar, West Bengal during the pre-kharif and kharif seasons of 2012. The objectives of the study were to estimate the stability of the 36 F1’s and the 9 parents for fibre yield and quality traits under different environments. The variance due to G × E showed significant interaction for all the traits except fibre percentage, indicating differential response of genotypes to different environments. Among the nine parents and 36 crosses, the parent (JRO 128) and cross (OIN 574 × JRO 128) were well adapted to all the five environments. The parents JRO 620 and JRO 878 for fibre yield and OIN 028 for fibre fineness and crosses OIJ 015 × OIN 028, OIJ 015 × OIJ 267, OIJ 015 × JRO 878, OIN 574 × JRO 878, OIN 580 × OIJ 267, OIN 580 × JRO 878 and JRO 620 × OIJ 267 for fibre yield, OIN 028 × OIN 580, OIN 580 × JRO 128 and JRO 128 × JRO 878 for fibre tenacity and OIN 217 × OIN 574 for fibre fineness, were stable under unfavourable environments. The crosses OIJ 015 × OIN 574 and OIN 028 × JRO 878 were found to be adaptable to favourable environments for both fibre yield per hectare and fibre tenacity. The parent JRO 620 and the crosses OIJ 015 × JRO 878, OIN 574 × OIN 580 and JRO 620 × JRO 878 for fibre yield, the parent JRO 128 and the crosses OIJ 015 × OIN 574 and OIN 028 × JRO 878 for fibre tenacity and the parent JRO 620 and the crosses OIN 028 × OIN 574, OIN 028 × JRO 878, OIN 580 × OIJ 267 and OIJ 267 × JRO 128 for fibre fineness, performed well in all the five environments on the basis of AMMI 1 and AMMI 2 biplot.
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