Current status of research on<i>rice yellow mottle Sobemovirus</i>

Salaudeen, Muhammadu Tajudeen; Banwo, O. O.; Kashina, B. D.; Alegbejo, M. D.

doi:10.1080/03235400801939912

Cited by 10 publications

(7 citation statements)

References 39 publications

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“…In Burkina Faso, yellow mottle disease was first reported in 1981 ( John, Thottapilly, and Awoderu 1984 ; Salaudeen et al. 2010 ) and research on this virus began with an intensive sampling in 1994–5 ( Konate, Traore, and Coulibaly 1997 ).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of the rice yellow mottle disease in western Burkina Faso: Epidemic monitoring, spatio-temporal variation of viral diversity, and pathogenicity in a disease hotspot

Billard,

Barro,

Sérémé

et al. 2023

Virus Evolution

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The 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 African continent. However, information on patterns of viral prevalence and viral diversity over multiple years at local scale remain scarce, in spite of potential implications for crop protection. Here we describe a five-years (2015-2019) monitoring of RYMV prevalence in six sites from western Burkina Faso (geographic areas of Bama, Banzon and Karfiguela). It confirmed one irrigated site as a disease hotspot, and also found one rainfed lowland site with occasional high prevalence levels. Within the studied fields, a pattern of disease aggregation was evidenced at a five-meter distance, as expected for a mechanically transmitted virus. Next, 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 meters side). One genetic lineage, named S1bzn, is the most recently emerged group and increased in frequency over the studied period (from 20% or less in 2015-2016, to more than 65% in 2019). Its genome results from a recombination between two other lineages (S1wa and S1ca). Finally, experimental work revealed that three rice varieties commonly cultivated in Burkina Faso 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. We found however, that infection outcome depended on the specific RYMV isolate, with two isolates from the lineage S1bzn accumulating at highest level at early infections. Overall, this study documents a case of high viral prevalence, high viral diversity, and co-occurrence of divergent genetic lineages at small geographic scale. A recently emerged lineage, which comprises viral isolates inducing severe symptoms and high accumulation in controlled conditions, could be recently rising through natural selection. Following up the monitoring of RYMV diversity is required to confirm this trend and further understand the factors driving the local maintenance of viral diversity.

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Section: Introductionmentioning

confidence: 99%

Dynamics of the rice yellow mottle disease in western Burkina Faso: Epidemic monitoring, spatio-temporal variation of viral diversity, and pathogenicity in a disease hotspot

Billard,

Barro,

Sérémé

et al. 2023

Virus Evolution

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show abstract

“…This finding was not surprising because of high mutation rates in RYMV, which is a virus that evolves rapidly (Fargette et al, 2008a). Multiple RYMV strains are widespread in Africa (Pinel-Galzi et al, 2007;Fargette et al, 2008b;Salaudeen et al, 2010). The West African strains were confirmed to mostly include isolates with threonine ("Tpathotype"); while a few isolates (called "Epathotype") had glutamic acid.…”

Section: Discussionmentioning

confidence: 90%

Evaluation of rice cultivars for resistance to rice yellow mottle virus

Kam¹,

Ndjiondjop²,

Ouedraogo³

et al. 2018

Afr. Crop Sci. J.

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“…In Burkina Faso, yellow mottle disease was first reported in 1981 (John, Thottapilly & Awoderu, 1984; Salaudeen et al, 2010) and research on this virus began with an intensive sampling in 1994-1995 (Konate, Traore & Coulibaly, 1997). Yellow mottle disease was known by the farmers from western Burkina Faso: reported as the most serious rice disease by farmers from ten villages of the Cascades Region (in southwestern Burkina Faso, Kam et al, 2013) and as a major concern for rice cultivation in the irrigated perimeter of Banzon (Traoré et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of the rice yellow mottle disease in western Burkina Faso: epidemic monitoring, spatio-temporal variation of viral diversity and pathogenicity in a disease hotspot

Billard¹,

Barro²,

Sérémé³

et al. 2023

Preprint

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The rice yellow mottle virus (RYMV) is a model in plant virus molecular epidemiology and phylogeography, with the reconstruction of historical introduction routes at the scale of the African continent. However, information on patterns of viral prevalence and viral diversity over multiple years at local scale remain scarce, in spite of potential implications for crop protection. Here we describe a five-years monitoring of RYMV prevalence in six sites from western Burkina Faso. This study confirmed one irrigated site as a disease hotspot, and found two rainfed lowland sites with occasional high prevalence levels. Within studied field, a pattern of disease aggregation was evidenced at a five-meter distance, as expected for a mechanically transmitted virus. Next, 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 (irrigated perimeter of ca. 520 ha), and also within various specific fields (25 meters side). One genetic lineage, named S1bzn, is the most recently introduced group and increased in frequency over the studied period. Its genome results from a recombination between two other lineages. Finally, experimental work evidenced no differences between three rice varieties cultivated in Burkina Faso in terms of resistance level, and no statistical effect of RYMV genetic group on symptom expression and viral load. We found however, that infection outcome depended on the specific RYMV isolate, with various isolates from the lineage S1bzn found to be particularly aggressive, including one accumulating at highest level. Overall, this study documents a case of high viral prevalence and high viral diversity, with the co-occurrence of divergent genetic lineages at small geographic scale. A recently introduced lineage, that includes viral isolates with high symptoms and accumulation in controlled conditions, could be recently rising though natural selection. Following up the monitoring of RYMV genetic and pathogenic diversity in the area is required to confirm this trend and further understand the factors driving the maintenance of viral diversity at local scale.

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Current status of research onrice yellow mottle Sobemovirus

Cited by 10 publications

References 39 publications

Dynamics of the rice yellow mottle disease in western Burkina Faso: Epidemic monitoring, spatio-temporal variation of viral diversity, and pathogenicity in a disease hotspot

Dynamics of the rice yellow mottle disease in western Burkina Faso: Epidemic monitoring, spatio-temporal variation of viral diversity, and pathogenicity in a disease hotspot

Evaluation of rice cultivars for resistance to rice yellow mottle virus

Dynamics of the rice yellow mottle disease in western Burkina Faso: epidemic monitoring, spatio-temporal variation of viral diversity and pathogenicity in a disease hotspot

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