Geminiviruses: Taxonomic Structure and Diversity in Genomic Organization

(E-pub Abstract Ahead of Print)

Author(s): Saurabh Kulshrestha*, Abhishek Bhardwaj, Vanshika.

Journal Name: Recent Patents on Biotechnology

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Background: Geminiviridae is one of the best-characterized and hence, one of the largest plant-virus families with highest economic importance. It’s members characteristically have a circular ssDNA genome within the encapsidation of twinned quasi-icosaheadral virions (18-38 nm size-range).

Objective: Construction of a narrative review on geminiviruses, to have a clearer picture about their genomic structure and taxonomic status.

Methods: Thorough search was conducted for papers and patents regarding geminiviruses, where relevant information was used for studying their genomic organization, diversity and taxonomic structure. Results: Geminiviruses have been classified into nine genera (viz., genus Begomovirus, Mastrevirus, Curtovirus, Topocuvirus, Becurtovirus, Turncurtovirus, Capulavirus, Eragrovirus and Grablovirus) having distinct genomic organizations, host ranges and insect vectors. Genomic organization of all genera generally shows the presence of 4-6 ORFs encoding for various proteins. For now, Citrus chlorotic dwarf-associated virus (CCDaV), Camellia chlorotic dwarf-associated virus (CaCDaV) and few other geminiviruses are still unassigned to any genera. The monopartite begomoviruses (and few mastreviruses) have been found associated with aplhasatellites and betasatellites (viz., ~1.3 kb circular ssDNA satellites). Recent reports suggests that deltasatellites potentially reduce the accumulation of helper-Begomovirus species in host plants. Some patents have revealed the methods for generating transgenic plants resistant to geminiviruses.

Conclusion: Geminiviruses are rapidly evolving and highly diverse group of plant-viruses. However, research has shown new horizons in tackling the acute begomoviral diseases in plants by generating a novel bio-control methodology in which deltasatellites can be used as bio-control agents and generating transgenic plants resistant to geminiviruses.

Keywords: Geminiviridae, Begomoviruses, Aplhasatellites, Betasatellites, Deltasatellites, ssDNA

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Article Details

(E-pub Abstract Ahead of Print)
DOI: 10.2174/1872208313666191203100851
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