Evidence that the proliferation stage of micropropagation procedure is determinant in the expression of Banana streak virus integrated into the genome of the FHIA 21 hybrid (Musa AAAB)

Dallot Sylvie, Acuna Pablo, Rivera Carmen, Ramirez Pilar, Côte François-Xavier, Lockhart Benham E.L., Caruana Marie-Line. 2001. Evidence that the proliferation stage of micropropagation procedure is determinant in the expression of Banana streak virus integrated into the genome of the FHIA 21 hybrid (Musa AAAB). Archives of Virology, 146 (11) : 2179-2190.

Résumé : Banana streak virus (BSV) is causing increasing concern in almost every producing area of banana and plantain (#Musa# spp.) worldwide. This situation appeared partially linked to some breeding lines and micropropagated hybrids. A complete BSV sequence integrated into the genome of a triploid plantain has been recently characterised and it has been hypothesised that it could give rise to infectious virus via recombination. In this study, we evaluated the effect of a routine micropropagation procedure on the expression of BSV in the FHIA 21 tetraploid hybrid. The widespread presence of integrated sequences and the absence of episomal BSV in thirty FHIA 21 "mother plants" selected for micropropagation were first confirmed by specific PCR and IC-PCR tests. The proliferation stage of the procedure, characterised by an intensive production of neoformed buds, appeared determinant in BSV expression whereas the rooting and acclimatisation stages had little or no effect. The duration in culture and the way of subdividing the clumps of proliferation influenced greatly the percentage of episomal BSV infections, reaching 58% of infected micropropagated lines after six #in vitro# subcultures. These data suggest that the expression of episomal BSV observed during the #in vitro# procedure is correlated with the presence of an integrated form.

Mots-clés Agrovoc : Musa, virus des végétaux, hybride, micropropagation, génome, Musa (plantains), triploïdie, expression des gènes, tétraploïdie, PCR, culture in vitro, repiquage, technique immunoenzymatique

Mots-clés complémentaires : Maladie de la mosaïque en tiret, Mosaïque en tirets

Classification Agris : H20 - Maladies des plantes
F30 - Génétique et amélioration des plantes
F02 - Multiplication végétative des plantes

Auteurs et affiliations

• Dallot Sylvie, UCR (CRI)
• Acuna Pablo, CORBANA (CRI)
• Rivera Carmen, UCR (CRI)
• Ramirez Pilar, UCR (CRI)
• Côte François-Xavier, CIRAD-FLHOR-BPA (FRA)
• Lockhart Benham E.L., University of Minnesota (USA)
• Caruana Marie-Line, CIRAD-AMIS-PROTECTION DES CULTURES (FRA) ORCID: 0000-0003-4486-2449

Source : Cirad - Agritrop (https://agritrop.cirad.fr/488679/)

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