Evaluation and molecular characterization of rice (Oryza sativa L.) genotypes against brown plant hopper (Nilaparvata lugens Stal.)
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Date
2019-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The study was conducted in the Department of Entomology and N.E. Borlaug Crop Research Center of G.B. Pant University of Agriculture and Technology, Pantnagar to identify the new source of resistance in 1,493 and 1,458 genotypes of AICRIP, during 2017 and 2018, respectively. Two genotypes were recorded as highly resistant whereas 15 genotypes were found to be resistant in both the years under glasshouse condition. Survival of BPH was very low on resistant varieties as compared to TN1 (Susceptible check). Due to low population of BPH under field condition, no conclusion could be drawn about performance of genotypes under field condition. Mechanism of host plant resistance was studied on 20 genotypes of PHSS against BPH. Resistant varieties PTB 33 and RP 2068-18-3-5 showed high level of antixenosis, antibiosis and tolerance against BPH. The resistance in genotypes was verified by SSR markers closely linked with BPH resistance gene. RM459 primer showed high polymorphic information content. The information about the genetic diversity of these rice varieties will be useful for proper identification and selection of appropriate parents for use in the breeding programs. After evaluating 1462 genotypes against Yellow stem borer (YSB) in field condition, 5 genotypes were identified as highly resistant while 6 genotypes were resistant against YSB. Present study identified so many new source of resistance against BPH and YSB which may be used for development of resistant varieties.
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