Biological control of bacterial blight of rice: Attempts to induce resistance using bioagents
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Keywords:Induced resistance, rice, Xanthomonas oryzae pv. oryzae, bioagents
Induced resistance and microbial antagonism were investigated as possible methods for control of bacterial blightÂ (BB) of rice caused by Xanthomonas oryzae pv. oryzae. Response of resistance genes identified against BB wasÂ studied under Chhattisgarh condition on genotype IRBB-59 (possessing three resistance genes i.e. Xa 5 + xa 13 +Â Xa 21). Seventy two hours before inoculation treatments were applied by thoroughly mixing the specific solutionÂ of bioagents (approximately 108 cfu ml-1) and sprayed on the foliage of the plants with the help of atomizer. AfterÂ 72 hours of treatment application, first four leaves from the top were pathogen inoculated by clip inoculation.Â Treatment with the bioagents showed significant reduction in disease severity, particularly plants were challengedÂ by clip inoculation. The result showed that Pseudomonas fluorescens sprayed @ 3g/l. superiorly reduced theÂ disease severity over control and at par with Bacillus subtilis @ 3g/l. Spraying of P. fluorescens 3g/l. significantlyÂ increased the bundle weight over control. However, it was at par with P. fluorescens 2g/l and B. subtilis 3g/l.
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