The study was conducted with the objective to assess the resistance source against blight in rapeseedmustard at Student's Instruction Farm, Acharya Narender Deva University of Agriculture and Technology Kumarganj Ayodhya (U.P.) during Rabi 2018-19. Screening of Indian mustard 47 genotypes, these screening was not found highly resistant, resistant and moderately resistance against Alternaria blight of rapeseed mustard six genotypes viz., Kiran, TMR-14-6, TMR-14-1, TMR-14-5, TMR-14-3, TMR-14-4 with disease severity of 5-10 per cent respectively were rated as moderately susceptible were found nine genotypes with disease severity 11-25 percent. 31genotypes were marked as susceptible in which disease severity was found to be 26 to 50%. The highly susceptible only one genotypes was found to be >50 present with disease severity respectively. It could be noticed that the vulnerability level was relatively quite high as compared to resistance status.
The present investigation was undertaken to identify the resistant lines amongst mutated rice population of the variety swarna induced by the sodium Azide. The variability in disease reaction was observed among mutated rice lines. Out of the total 1000 mutant plants, 47 plants were screened that show low disease index, ranged between 0 to 5 were selected for next M generation. In M2 generation the selected genotypes show differences for disease index, only 12 lines shows resistance in M2 generation in field condition and in humidity chamber condition only 8 lines shows resistance. The number of resistance lines were decreases in humidity condition. Non significant variation in morphological expression and in yield attributes among the selected mutants was also reported. Thus, these lines could be considered a potential source for disease resistance against the sheath blight of rice and could be used further in the crossing programme for development of sheath blight resistant rice variety.
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