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VirusDisease

, Volume 30, Issue 3, pp 403–412 | Cite as

Characterization of cucumber mosaic virus infecting coleus (Plectranthus barbatus) in Karnataka

  • B. S. Pavithra
  • Kedarnath Govin
  • H. M. Renuka
  • M. KrishnareddyEmail author
  • S. Jalali
  • D. K. Samuel
  • K. Himabindu
Original Article
  • 31 Downloads

Abstract

Plectranthus barbatus also known by the synonym Coleus forskohlii it is called as forskohlii and Indian coleus. It is a tropical perennial herb belongs to the family Lamiaceae widely cultivated in India used as traditional medicinal crop. Its tuberous roots produce forskolin, an extract useful for pharmaceutical preparations and research in cell biology. The incidence of mosaic with dark and light green patches, mottling, leaf distortion and reduction growth was noticed in commercial cultivation of coleus. For identification of the virus, the infected leaf sample extract was mechanically inoculated to different hosts such as chilli, tobacco, tomato, cucumber, cowpea and Chenopodium amaranticolor. Host range studies revealed that the virus showed severe mosaic symptoms on Nicotiana spp. and Cucumis spp. The virus produced systemic and local lesion symptoms in a different host. The Leaf dip preparation of virus infected leaf extract was observed under an electron microscope showed the presence of isometric particles of 28 nm in size. The healthy and infected samples were tested using DAC-ELISA against antibodies of CMV, GBNV and TSV the infected samples showed strong positive reaction with 1.85 optical density to CMV antibodies indicated the presence of CMV. For molecular identification, total RNA was isolated and used for RT-PCR amplification using CMV specific primers. RT-PCR resulted in the positive amplification in virus infected samples but not from a healthy control. The complete genome of CMV RNA-1 consists of 3360 nucleotides (nt) encoding replicase gene of 807 amino acids (aa). The CMV RNA-2 was 2983 nt in length containing 2a (859 aa) encoding RNA dependent RNA polymerase protein and 2b encoding viral silencing suppressor (112 aa), while RNA-3 encoding 3a movement protein (280 aa) and coat protein (219 aa) was 2223 nt in length. Phylogenetic analyses of nucleotide sequences of coleus CMV isolate is closely related to subgroup IB than to subgroup IA or II with other CMV isolates. In recombination analysis, the recombination event occurs between the subgroups of I, II as well as IA and IB in RNA 1, RNA2 and RNA3 of coleus isolate with other CMV isolates. To best of our knowledge, this is the first report of CMV infection in coleus.

Keywords

Coleus CMV Inoculation DAC-ELISA Characterization Complete genome Recombination 

Notes

Acknowledgements

This work carried under ICAR-CRP on vaccines and diagnostic project the authors are thankful for the financial support. First Author also thank to Director, Head, Division of plant pathology IIHR, Bengaluru for providing laboratory facility for conducting experiments.

Supplementary material

13337_2019_536_MOESM1_ESM.docx (39 kb)
Supplementary material 1 (DOCX 39 kb)

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Copyright information

© Indian Virological Society 2019

Authors and Affiliations

  1. 1.Division of Plant PathologyICAR-Indian Institute of Horticultural ResearchBengaluruIndia
  2. 2.Department of Plant Pathology, GKVKUniversity of Agricultural SciencesBengaluruIndia
  3. 3.Division of Floriculture and Medicinal CropsICAR-Indian Institute of Horticultural ResearchBengaluruIndia

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