@article{fdi:010089716,
  title = {{D}ynamics of the rice yellow mottle disease in western {B}urkina {F}aso : epidemic monitoring, spatio-temporal variation of viral diversity, and pathogenicity in a disease hotspot},
  author = {{B}illard, {E}stelle and {B}arro, {M}. and {S}{\'e}r{\'e}me, {D}. and {B}angratz, {M}artine and {W}onni, {I}. and {K}oala, {M}. and {K}assankogno, {A}. {I}. and {H}{\'e}brard, {E}ug{\'e}nie and {T}h{\'e}baud, {G}. and {B}rugidou, {C}hristophe and {P}oulicard, {N}ils and {T}ollenaere, {C}harlotte},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he rice yellow mottle virus ({RYMV}) is a model in plant virus molecular epidemiology, with the reconstruction of historical introduction routes at the scale of the {A}frican continent. {H}owever, information on patterns of viral prevalence and viral diversity over multiple years at a local scale remains scarce, in spite of potential implications for crop protection. {H}ere, we describe a 5-year (2015-9) monitoring of {RYMV} prevalence in six sites from western {B}urkina {F}aso (geographic areas of {B}ama, {B}anzon, and {K}arfiguela). {I}t confirmed one irrigated site as a disease hotspot and also found one rainfed lowland ({RL}) site with occasional high prevalence levels. {W}ithin the studied fields, a pattern of disease aggregation was evidenced at a 5-m distance, as expected for a mechanically transmitted virus. {N}ext, we monitored {RYMV} genetic diversity in the irrigated disease hotspot site, revealing a high viral diversity, with the current coexistence of various distinct genetic groups at the site scale (ca. 520 ha) and also within various specific fields (25 m side). {O}ne genetic lineage, named {S}1bzn, is the most recently emerged group and increased in frequency over the studied period (from 20 per cent or less in 2015-6 to more than 65 per cent in 2019). {I}ts genome results from a recombination between two other lineages ({S}1wa and {S}1ca). {F}inally, experimental work revealed that three rice varieties commonly cultivated in {B}urkina {F}aso were not different in terms of resistance level, and we also found no significant effect of {RYMV} genetic groups on symptom expression and viral load. {W}e found, however, that infection outcome depended on the specific {RYMV} isolate, with two isolates from the lineage {S}1bzn accumulating at the highest level at early infections. {O}verall, this study documents a case of high viral prevalence, high viral diversity, and co-occurrence of divergent genetic lineages at a small geographic scale. {A} recently emerged lineage, which comprises viral isolates inducing severe symptoms and high accumulation under controlled conditions, could be recently rising through natural selection. {F}ollowing up the monitoring of {RYMV} diversity is required to confirm this trend and further understand the factors driving the local maintenance of viral diversity.},
  keywords = {rice ; {RYMV} ; crop virus ; epidemiology ; spatio-temporal dynamics ; diversity ; recombination ; {BURKINA} {FASO}},
  booktitle = {},
  journal = {{V}irus {E}volution},
  volume = {9},
  numero = {2},
  pages = {vead049 [17 ]},
  year = {2023},
  DOI = {10.1093/ve/vead049},
  URL = {https://www.documentation.ird.fr/hor/fdi:010089716},
}