Genetic improvement of an indigenous aromatic variety 'Jajai 77' through mutagenesis.

摘要

The mutant Jajai-25/A has been developed from an indigenous aromatic rice variety Jajai 77 through radiation by gamma rays (250 Gy). The mutant Jajai-25/A was initially selected on the basis of short plant stature, lodging resistance and improved yield components. After confirmation, the performance was evaluated in preliminary and advanced yield trials. The analysis of variance of different trials revealed significant differences among all the mutants, parents and check varieties. This mutant was significantly better than its mother variety Jajai 77 in respect of all the yield and yield contributing traits. It has shown consistency in better paddy yield than all the mutant lines, including its parent and local check in preliminary and advanced yield varietal trials. Jajai-25/A produced 57% higher paddy yield than its parent Jajai-77 and 33% higher than the check variety Super Basmati. The mutant maintained its yield superiority in the zonal trials in Sindh province and produced 3911 kg/ha in comparison to Super Basmati (2941kg/ha). In the national trials, it exhibited yield superiority and ranked first (4372 kg/ha) at the national level (NURYT-2006).