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Articles by Sunil Misra
Total Records ( 2 ) for Sunil Misra
  Savarapu Sugnana Kumari , Sunil Misra , Mutheneni Srinivasa Rao and Upadhyayula Suryanarayana Murty
  Silkworm, Bombyx mori, is a very important economically exploited insect in South East Asia and revealing its genetic variation and diversity among genetic stock and appropriate classification method is needed for identification of potential parents. In the present study, the genetic divergence in 56 silkworm genotypes on 13 important qualitative and quantitative traits using Self Organizing Maps (SOM) was analyzed through cluster analysis. The highest level of genetic diversity were found in polyvoltine breeds by dividing into 8 different clusters and 6 clusters among bivoltine shown in two dimensional images called Kohonen maps. This clustering method allowed to divide the observations into several subclusters in such a way that homogeneity was obtained inside the sub-clusters and heterogeneity among the sub-clusters. Popular genotypes like Pure Mysore (PM), Nistari (NT-M, NT-P) were included in the cluster with 21.875% intra cluster difference among polyvoltine genotypes. Further, NB4D2-1 included in the cluster with 16.66% intra cluster differences along with other among bivoltine genotypes. It respectively indicates possibility of their exploitation in the field. There are numerous applications involving in the SOM algorithm but the most widespread employ was the identification and visualization of natural clustering in the data. Results indicated better ascertaining on the genetic diversity and genetic background on these silkworm genotypes provide ample scope to utilize them to achieve the desired objectives of highly heterotic silkworm hybrids to increase silk productivity in this region were discussed for the first time.
  S. Sugnana Kumari , S.V. Subba Rao , Sunil Misra and U. Suryanarayana Murty
  Research was aimed at investigation effect of dichloromethane and methanol (1:1) extract of seaweed brown algae, Turbinaria conoides for its antifungal activity against Beauveria bassiana an entomopathogenic fungus on silkworm based on in vitro by agar cups bioassay method and in viva application of crude seaweed algal extract to muscardine infected silkworm larvae. The extract of T. conoides has shown antifungal activity and inhibitory effect against this fungus through in vitro bioassay studies. The inhibitory effect increased with increased concentration of algal curde extract. Further, three different concentrations of this algal extract were tested against Beauveria bassiana infected silkworm larvae. The effective concentration was evaluated between 1000 to 1500 μg mL-1 of the algal extracts. It was established that with the application of these algal extract about 75 to 85% of larval mortality due to B. bassiana infection was controlled with out affecting the other qualitative and quantitative traits. Therefore, present communication sturdily dedicated to find out cheapest and eco-friendly disinfectant for prevent or treat fungal diseases in silkworm could be an alternative treatment process under disease management in sericulture industry.
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