# Stronger together: Synergy between an emerging monopartite begomovirus and a DNA-B component

Alassane Ouattara, Fidèle Tiendrebeogo, Nathalie Becker, Cica Urbino, Gaël Thébaud, Murielle Hoareau, Agathe Allibert, Frédéric Chiroleu, Marie-Stéphanie Vernerey, Edgar Valentin Traoré, et al.

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## ► To cite this version:

Alassane Ouattara, Fidèle Tiendrebeogo, Nathalie Becker, Cica Urbino, Gaël Thébaud, et al. Stronger together: Synergy between an emerging monopartite begomovirus and a DNA-B component. 19. Rencontres de virologie végétale (RVV 2023), SFV; SFP; RIVOC; IRD; INRAE; CNRS; CIRAD; Agropolis, Jan 2023, Aussois, France. pp.57. hal-05180422

HAL Id: hal-05180422

https://hal.science/hal-05180422v1

Submitted on 23 Jul 2025

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Distributed under a Creative Commons Attribution 4.0 International License
Stronger together : Synergy between an emerging monopartite begomovirus
and a DNA-B component

**Alassane Ouattara**, Fidèle Tiendrébéogo, Nathalie Becker, Cica Urbino, Gaël Thébaud, Murielle Hoareau, Agathe Allibert, Frédéric Chiroleu, Marie-Stéphanie Vernerey, Edgar Valentin Traoré, Nicolas Barro, Oumar Traoré, Pierre Lefeuvre & Jean-Michel Lett

AO, NB : University Joseph KI-ZERBO, Burkina Faso; FT, EVT, OT : INERA, Burkina Faso; NB : ISYEB, MNHN CNRS, Sorbonne University, France; CU, GT, M-SV : UMR PHIM, CIRAD, INRAE, France; MH, AA, FC, PL, J-ML : UMR PVBMT CIRAD, France

In recent decades, a legion of monopartite begomoviruses transmitted by the whitefly Bemisia tabaci has emerged as serious threats to vegetable crops in Africa. Recent studies in Burkina Faso (West Africa) reported the predominance of pepper yellow vein Mali virus (PepYVMLV) and its frequent association with a previously unknown DNA-B component. To understand the role of this DNA-B component in the emergence of PepYVMLV, we assessed biological traits related to virulence, virus accumulation, location in the tissue and transmission. We demonstrate that the DNA-B component is not required for systemic movement and symptom development of PepYVMLV (non-strict association), but that its association produces more severe symptoms including growth arrest and plant death. The increased virulence is associated with a higher viral DNA accumulation in plant tissues, an increase in the number of contaminated nuclei of the phloem parenchyma and in the transmission rate by B. tabaci. Our results suggest that the association of a DNA-B component with the otherwise monopartite PepYVMLV is a key factor of its emergence.