Molecular characterization of banana bunchy top virus reveals widespread low genetic variation among isolates in Democratic Republic of Congo

Mukwa Lyna Fama Tongo, Gillis A., Vanhese V., Romay Gustavo, Galzi Serge, Laboureau Nathalie, Kalonji Mbuyi A., Iskra Caruana Marie-Line, Bragard Claude. 2016. Molecular characterization of banana bunchy top virus reveals widespread low genetic variation among isolates in Democratic Republic of Congo. In : Building bridges between disciplines for sustainable management of plant virus diseases. INRA, Université d'Avignon. Avignon : INRA, Résumé, 114. International Plant Virus Epidemiology Symposium. 13, Avignon, France, 6 Juin 2016/10 Juin 2016.

Résumé : BACKGROUND and OBJECTIVES Banana bunchy top virus (BBTV), is the most devastating and widespread banana virus. Banana and plantain (Musa spp.) are major crops in terms of household income and food security in Democratic republic of Congo (DRC) (1). Despite the large territory under banana and plantain cultivation in the country, the genetic characterization of BBTV isolates has been undertaken for two provinces. The main objectives of this work were to understand the genetic variability of DRC BBTV isolates and to determine their origin. MATERIALS and METHODS In this study, genetic variation in BBTV was assessed from 52 BBTV isolates collected in five out of 11 provinces in DRC (Bandundu, Bas-Congo, Katanga, Kinshasa and Kasai Oriental). 52 full sequences of DNAR and 30 full sequences of all BBTV components were analysed. RESULTS Full genome sequencing of DNA-R components was performed revealing a low genetic variation (98-100% nucleotide identity) amongst the BBTV isolates detected in seven of 11 DRC provinces. The phylogenetic tree showed that all DRC isolates gather a unique clade in the South Pacific group of BBTV. Based on the coding region for replication initiator protein, haplotype diversity was estimated to be 0.944±0.013, with 30 different haplotypes from 68 isolates in DRC. In addition, fives isolates were selected from each province for total genome sequencing, confirming low genetic variation among isolates from seven provinces (97-100% nucleotide identity). CONCLUSION This study strengthens the hypothesis of a single BBTV introduction some time ago, followed by the spread of the virus in the country. Analysis of the geographical dispersion reveals specific haplotypes groups according to the different agro-environmental conditions.

Classification Agris : H20 - Maladies des plantes

Auteurs et affiliations

• Mukwa Lyna Fama Tongo, Clinique des Plantes de Kinshasa (COD)
• Gillis A., UCL (BEL)
• Vanhese V., UCL (BEL)
• Romay Gustavo, UCL (BEL)
• Galzi Serge, CIRAD-BIOS-UMR BGPI (FRA)
• Laboureau Nathalie, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0002-0105-3919
• Kalonji Mbuyi A., University of Kinshasa (COD)
• Iskra Caruana Marie-Line, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0003-4486-2449
• Bragard Claude, UCL (BEL)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/581594/)

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