How to control and prevent the spread of banana streak disease when the origin could be viral sequences integrated in banana genome?

Iskra Caruana Marie-Line, Gayral Philippe, Galzi Serge, Laboureau Nathalie. 2009. How to control and prevent the spread of banana streak disease when the origin could be viral sequences integrated in banana genome?. In : Proceedings of the international symposium on recent advances in banana crop protection for sustainable production and improved livelihoods, White River, South Africa, September 10-14, 2007. Jones David R. (ed.), Van den Bergh Inge (ed.). ISHS. Louvain : ISHS [Belgique], 77-84. (Acta Horticulturae, 828) ISBN 978-90-6605-488-2 International Symposium on recent advances in banana crop protection for sustainable production and improved livelihoods. 1, White River, Afrique du Sud, 10 Septembre 2007/14 Septembre 2007.

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Résumé : Banana streak viruses are among the most widely distributed viruses of banana and are responsible for banana streak disease. Natural field spread occurs by either mealybugs or use of infected planting material, such as suckers. Banana streak viruses are pararetroviruses belonging to the genus Badnavirus, in the family Caulimoviridae. Like all members of the Badnavirus genus, they have bacilliform virions, 30 x 150 nm in size and a circular dsDNA genome of 7.4kbp. Fifteen years ago, an increasing number of outbreaks of banana streak disease were reported worldwide. Many occured in banana breeding lines and micropropagated inter-specific banana hybrids. The origin of infections in new hybrids and tissue-cultured plants was linked to the presence of viral DNA sequences integrated into the Musa balbisiana genome. Although integration is not an essential step in the replication cycle of pararetroviruses, it is assumed that under stress conditions some endogenous banana streak viruses could become infectious by reconstituting a complete replication-competent viral genome. Several serological and molecular tools have been developed to detect either virions or endogenous banana streak viruses. They specificity and potential to prevent and control outbreaks of banana streak disease is discussed.

Mots-clés Agrovoc : Musa, virus des végétaux, génome, transmission des maladies, contrôle de maladies, séquence nucléotidique, virologie, immunologie

Mots-clés complémentaires : Banana streak virus

Classification Agris : H20 - Maladies des plantes

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