Odontoglossum ringspot virus

Family   : Virgaviridae
Genus    : Tobamovirus
Acronym  : ORSV

Introduction

Odontoglossum ringspot virus (ORSV) was first isolated from the orchid Odontoglossum grande and later found to infect Cymbidium spp. ORSV causes chlorotic or necrotic sunken lesions on both leaves and flowers of orchids and flowers may also be deformed and exhibit colour breaking. The virus is transmitted mechanically and can persist for long periods in potting media.

Major Diseases

Ring spot disease.

Geographical Distribution

Sikkim and Darjeeling hills

Particle Morphology

A virus with rod-shaped particles 300 x 18 nm.

Transmission Method

Transmitted by means not involving a vector. Virus transmitted by mechanical inoculation.

Detection

Slot-blot hybridisation, ELISA and RT-PCR.

Host Range and Symptomatology ShowHide

Host	Symptoms
Odontoglossum grande	Chlorotic or necrotic lesions on leaves and flowers, deformation and colour breaking of flowers.
Orchids	Flower colour-breaking, chlorotic streaking, mosaic or necrosis and symptom less in some cultivars.

References ShowHide

1	Odontoglossum ringspot virus. [Distribution map].. 2008, Distribution Maps of Plant Diseases, October (Edition 1), pp Map 1037.
2	Rani, P. ; Pant, R. P. ; Jain, R. K., Serological detection of Cymbidium mosaic and Odontoglossum ringspot viruses in orchids with polyclonal antibodies produced against their recombinant coat proteins.. 2010, Journal of Phytopathology, 158, 07-Aug, pp 542-545.
3	Sherpa, A. R. ; Bag, T. K. ; Hallan, V. ; Zaidi, A. A., Detection of Odontoglossum ringspot virus in orchids from Sikkim, India.. 2006, Australasian Plant Pathology, 35, 1, pp 69-71.
4	Zaidi, A. A. ; Hallan, V. ; Rana, T. ; Raikhy, G. ; Ram, R., Viruses in ornamental crops and their management: an Indian scenario.. 2009, Journal of Ornamental Horticulture, 12, 3, pp 147-166.

Sequences ShowHide