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Articles by Savarapu Sugnana Kumari
Total Records ( 2 ) for Savarapu Sugnana Kumari
  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.
  Savarapu Sugnana Kumari , Veeragoni Dileep Kumar and Bollepelli Priyanka
  Background and Objective: Marine organisms are the rich source of structurally novel and biologically active metabolites. Secondary or primary metabolites produced by these organisms may be potential bioactive compounds of interest in the pharmaceutical industry. This study aimed to investigate the antifungal activity of the methanol extract of three seaweeds Caulerpa serrulata, Gracilaria edulis and Ulva fasciata against silkworm fungal pathogen, Nomuraea rileyi. Materials and Methods: The crude extracts of all the seaweeds were concentrated in a rotary evaporator and the concentrates were tested at 1000, 2000 and 3000 μg mL–1 for their antifungal efficacy in vitro and at 3000 μg mL–1 against silkworm pathogen Nomuraea rileyi in vivo. The data obtained were recorded for each trails in a Randomized Complete Block Design (RCBD) and was subjected with the Indostat software analysis for its significance. Results: Among the tested extracts maximum zone of inhibition of 16 mm was observed in Gracilaria edulis and Ulva fasciata treated batches at 3 mg mL–1 against N. rileyi. In vivo results revealed maximum effective rearing rate of 79% in batches treated with Gracilaria edulis against Nomuraea rileyi followed by Ulva fasciata of 75% effective rearing rate and found to be significant at p<0.01. Conclusion: Both Gracilaria edulis and Ulva fasciata crude methanol extracts can be used as antifungal agents in preparing eco-friendly disinfectants. These disinfectants can be used to treat silkworms infected by Nomuraea rileyi in silkworm rearing for the better crop yield without any limitations in sericulture industry.
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