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Srivasatava, A.

Publications and source records attributed to Srivasatava, A..

2 recordsLinked to original sources

Perilous coexistence: Chilli Leaf Curl Virus and Candidatus Phytoplasma trifolii infecting Capsicum annuum, India

Molecular computing was used to investigate the possible causal agents of chilli crop samples showing mixed symptoms of yellow leaf curl and little leaf type diseases in the Uttar Pradesh province, India. Total genomic DNA was extracted from twenty-five samples and amplified by PCR using a universal primer pair for begomovirus and phytoplasma. Mixed infection samples show positive amplified products for begomovirus (DNA-A and betasatellite) and phytoplasma (16S rRNA and Sec A). The identified begomovirus from chilli samples was identified as a strain isolate of the previously described Chilli Leaf Curl Virus (94.2% nucleotide sequence identity), which is known to infect Solanum lycopersicon, in Oman, whereas the 16S rRNA was identified from the source Candidatus Phytoplasma trifolii (99.04% nucleotide sequence identity), which is known to infect Helichrysum flowering plants in India. Subsequently, molecular computing research based on phylogenetic interweaves, putative recombination, amino acid selection, and genetic diversity were investigated, revealing divergent evolutionary patterns with significant variation and recombination events. The majority of the sequence variations observed in begomovirus and phytoplasma were caused via inter- and intra-specific recombination. These findings could be the first in silico combined infection analysis of ChiLCV and Ca.P.trifolii in a chilli crop in India, revealing the potential adaption and evolution of begomovirus and phytoplasma to a new geographic range and crop.

molecular biology↗

Evolutionary dynamics of Begomoviruses causing Papaya leaf curl disease in India

The genus begomovirus represents a group of multipartite viruses that significantly damages many agricultural crops, including papaya and drastically influence the overall production. Understanding the genetic variations, mutations and recombination of the begomovirus population infecting papaya has several important implications in alleviating substantial losses, mainly in developing countries, including India. In an attempt for a bioinformatics driven study of diversity and variability of papaya leaf curl disease in India, a total of thirty-two (32) DNA-A and sixteen (16) betasatellite sequences were retrieved from GenBank. An uneven distribution of evolutionary divergence has been observed across the branch length, which triggered the estimated recombinational event. Interestingly, a maximum of the begomoviruses were found to be intra-species recombinants. Further genetic variability, selection pressure, and substitution rate acting on the population were estimated and found to be high enough to support the evolution of geminiviruses. Genetic divergence composition in all begomovirus datasets revealed predominance of nucleotide diversity driven by mutation. The analysis indicates that even though a significant fraction of the genetic variations might be due to recombination but, it was constantly lower than the mutation rate. Thus, the diversification of the begomovirus population is principally impelled by mutational dynamics.

pathology↗