Not the one, but the only one: about Cannabis cryptic virus in plants showing ‘hemp streak’ disease symptoms

Springer Science and Business Media LLC - Tập 150 - Trang 575-588 - 2017
Laura Righetti1, Roberta Paris1, Claudio Ratti2, Matteo Calassanzio2, Chiara Onofri1, Davide Calzolari1,3, Wulf Menzel4, Dennis Knierim5, Gianmaria Magagnini1, Daniela Pacifico1, Gianpaolo Grassi1
1CREA - Council for Agricultural Research and Economics, Research Centre for Cereal and Industrial Crops, Bologna, Italy
2DipSA - Plant Pathology, University of Bologna, Bologna, Italy
3Department of Sustainable Crop Production, Università Cattolica del Sacro Cuore, Piacenza, Italy
4Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany
5Leibniz Institute, DSMZ – German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany

Tóm tắt

Interveinal chlorosis and leaf margin wrinkling are widespread symptoms of Cannabis sativa. They are traditionally attributed to the so-called hemp streak virus (HSV), but its existence has not been demonstrated yet. To our knowledge, no molecular investigation has so far been performed in order to identify the causal agent of this symptomatology, we therefore decided to use traditional and molecular virology techniques to better characterize symptoms and pursue the etiological agent. No pathogenic virus was found by using targeted PCR reactions and by RNA sequencing, whereas we were able to detect the Cannabis cryptic virus (CanCV) with both techniques. We, therefore, developed an RT-qPCR assay based on a CanCV-specific TaqMan probe and applied it to a wide range of symptomatic and symptomless plants, using a two-step (for quantification), or a one-step (for fast detection) protocol. Both symptoms and the virus were only shown to be transmitted vertically and did not pass via mechanical inoculation or grafting, though we could not find any cause-effect correlation between them. In fact, the virus was found in all the tested hemp samples, and its abundance varied greatly between different accessions and individuals, independently from the presence and severity of symptoms. The suggestion that hemp streak is caused by a virus is therefore questioned. Some abiotic stresses seem to play a role in triggering the symptoms but this aspect needs further investigation. For breeding purposes, a selection of parental plants based on the absence of symptoms proved to be efficient in containment of the disease.

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