Yield performance of radiation induced rapeseed mutants at M8 generation

Rapeseed is the most potential oil seed crops of Indian sub-continent. So higher seed yield potential variety is central choice of rapeseed grower. To verify the yield performances of rapeseed mutants an experiment was conducted at various locations of Bangladesh. Four true breeding (homozygous) mutants obtain from three different radiation doses (600, 800 and 900 Gy) along with the mother variety BARI Sarisha-15 and check variety BARI Sarisha-17 were used for each condition. The experiment was laid out in a randomized complete block design with three replications. Interaction between genotype and location showed significant variations for all the agronomic traits, whereas only non-significant variations were provided from branch plant-1 and siliquae length for location. Mutant RM-20 produces the highest plant height (101.1cm) and matures earlier than all other mutants' parent and check. At Magura and Ishurdi all the mutants produce significantly higher number of siliquae plant-1 then parent BARI Sarisha-15 and check BARI Sarisha-17. RM-18 and RM-20 produce maximum seeds siliquae-1 (30) whereas the mutant RM-07 produced lowest number of seeds siliquae-1 (22). Combined means over locations showed that mutants namely RM-18 and RM-20 produced significantly higher seed yield (1551.1 and 1385 kg/ha, respectively). This suggests that gamma ray's irradiation can be fruitfully applied to develop mutants with higher seed yield and other agronomic traits in rapeseed