A protocol for the rapid isolation of full geminivirus genomes from dried plant tissue

Shepherd Dionne Natalie, Martin Darren Patrick, Lefeuvre Pierre, Monjane Adérito Luis, Owor Betty E., Rybicki Edward P., Varsani Arvind. 2008. A protocol for the rapid isolation of full geminivirus genomes from dried plant tissue. Journal of Virological Methods, 149 (1) : 97-102.

Résumé : A high-throughput method of isolating and cloning geminivirus genomes from dried plant material, by combining an Extract-n-Amp-based DNA isolation technique with rolling circle amplification (RCA) of viral DNA, is presented. Using this method an attempt was made to isolate and clone full geminivirus genomes/genome components from 102 plant samples, including dried leaves stored at room temperature for between 6 months and 10 years, with an average hands-on-time to RCA-ready DNA of 15 min per 20 samples. While storage of dried leaves for up to 6 months did not appreciably decrease cloning success rates relative to those achieved with fresh samples, efficiency of the method decreased with increasing storage time. However, it was still possible to clone virus genomes from 47% of 10-year-old samples. To illustrate the utility of this simple method for high-throughput geminivirus diversity studies, six Maize streak virus genomes, an Abutilon mosaic virus DNA-B component and the DNA-A component of a previously unidentified New Word begomovirus species were fully sequenced. Genomic clones of the 69 other viruses were verified as such by end sequencing. This method should be extremely useful for the study of any circular DNA plant viruses with genome component lengths smaller than the maximum size amplifiable by RCA.

Mots-clés Agrovoc : Geminiviridae, virus striure du maïs, génome, isolement, technique analytique, PCR, culture de tissu, tissu végétal, extraction, adn

Classification Agris : H20 - Maladies des plantes

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Shepherd Dionne Natalie, UCT (ZAF)
• Martin Darren Patrick, Institute of Infectious Diseases and Molecular Medicine (ZAF)
• Lefeuvre Pierre, CIRAD-BIOS-UMR PVBMT (REU)
• Monjane Adérito Luis, UCT (ZAF)
• Owor Betty E., UCT (ZAF)
• Rybicki Edward P., UCT (ZAF)
• Varsani Arvind, UCT (ZAF)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/544103/)

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