National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Bacterial blight (BB) is one of the serious and wide spread diseases of many rice cultivating areas in India as well as world. Development of cultivars pyramided with more than two BB resistance genes increases durable resistance to prevailing and emerging biotypes and it offers environment safe approach to manage the disease. The present study was carried out to screen the improved lines with the foreground markers of Xa21, xa13, xa5, Xa33 and Xa38 and the confirmed plants were evaluated for phenotypic resistance against the local isolate of BB under the controlled conditions. Further, the lines harboring BB resistance genes were evaluated for key-morphological traits to identify the superior genotypes. The bioassay revealed, most of the lines harboring Xa21, xa13, xa5andXa33/Xa38 in homozygous conditions were displayed high degree of resistance to bacterial blight with a mean lesion length (LL) ranged from 2.13 ± 0.41to 2.92 ± 0.65. The bioassay results also suggest, the lines harboring Xa21+ xa13 + xa5 + Xa33 resistance genes were observed to have less lesion length (2.13 ± 0.45) than Xa21+ xa13 +xa5 + Xa38 resistance genes (2.81 ± 0.40). Cluster analysis of 24 improved lines based on co-efficient of genetic distance, identified the superior genotypes, which posses morphological characters as recurrent parents and also enriched with BB resistance genes.
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