Rice seedbeds as a source of primary infection by Rice yellow mottle virus

Traoré, Oumar; Traoré, M.; Fargette, Denis; Konaté, G.

doi:10.1007/s10658-006-9004-9

Cited by 30 publications

(17 citation statements)

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“…The role of rice seedbeds was however neglected, and the same plows were used in a given area. The farmers were not aware of the involvement of cows, donkeys, and rice seedbeds in the movement and persistence of RYMV, despite other sanitation practices [13,28,29]. As described by farmers in the region of Tillabéry.…”

Section: Discussionmentioning

confidence: 99%

Farmers’ rice knowledge and adoption of new cultivars in the Tillabéry region of western Niger

et al. 2015

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Section: Discussionmentioning

confidence: 99%

Farmers’ rice knowledge and adoption of new cultivars in the Tillabéry region of western Niger

et al. 2015

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“…RYMV is non-seed transmissible in rice and wild host species [5] [6]. However, it is known as a highly infectious and very stable virus transmitted by several means including wind, insects, mammals and man [7]- [9]. Significant yield losses induced by RYMV (25% -100%) have been reported by several authors, although most studies were done under experimental conditions [4] [10]- [13].…”

Section: Introductionmentioning

confidence: 99%

Farmers’ Perception and Impact of Rice Yellow Mottle Disease on Rice Yields in Burkina Faso

Traoré¹,

Néya²,

Camara³

et al. 2015

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Rice improvement for disease resistance has scarcely involved farmers' knowledge in Sub-Saharan Africa. A participatory rural appraisal was conducted in two main rice cultivation areas in Burkina Faso to assess farmers' awareness of rice production constraints with emphasis on rice yellow mottle disease (RYMD) and its management. Farmers' preference for rice varieties to be used in the breeding program was also assessed. Major concerns for rice cultivation as perceived by farmers were water shortage and RYMD. However, relative importance of each constraint depended on the survey areas, RYMD being prominent at Banzon while water shortage predominated at Mogtedo. Mogtedo farmers preferred rice variety FKR19 because of its tolerance to drought. At Banzon, farmers' first criterion was taste which was reflected in the choice of variety FKR18. Yield was also a major criterion in both areas, positioning NERICA varieties FKR56N, FKR62N, and FKR60N among the top preferred varieties. Farmers mentioned RYMD as the most important rice disease. Most farmers used varietal shifts or pesticide treatments for RYMD management. RYMD incidence reached 28% in average at Banzon over the 2012-2013 main growing seasons. In rice varieties FKR56N, FKR62N and TS2, diseased plants yielded 79.3% less than the healthy ones. Accordingly, based on disease incidence, overall yield loss in the study area was estimated at 22.3%. Altogether, rice production can be significantly increased by taking RYMD into account in a participatory rice breeding strategy.

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“…This spatial pattern of RYMV diversity is explained by the absence of seedborne transmission and of long-distance movement (Allarangaye et al 2006;Fargette et al 2006;Konaté et al 2001). In addition to short-distance propagation that is mainly mediated by beetles, RYMV is transmitted by contact during agricultural practices such as transplantation from rice nurseries to fields (Bakker 1974;Traoré et al 2006b). …”

Section: Introductionmentioning

confidence: 99%

“…In addition to short-distance propagation that is mainly mediated by beetles, RYMV is transmitted by contact during agricultural practices such as transplantation from rice nurseries to fields (Bakker 1974;Traoré et al 2006b). In combination with the surveillance of seedbed contamination (Traoré et al 2006b), varietal selection is the most efficient and sustainable way to manage RYMV. Several sources of resistance have been identified in the two cultivated rice species.…”

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Identification of a Hypervirulent Pathotype of Rice yellow mottle virus: A Threat to Genetic Resistance Deployment in West-Central Africa

et al. 2018

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Rice yellow mottle virus (RYMV) causes high losses to rice production in Africa. Several sources of varietal high resistance are available but the emergence of virulent pathotypes that are able to overcome one or two resistance alleles can sometimes occur. Both resistance spectra and viral adaptability have to be taken into account to develop sustainable rice breeding strategies against RYMV. In this study, we extended previous resistance spectrum analyses by testing the rymv1-4 and rymv1-5 alleles that are carried by the rice accessions Tog5438 and Tog5674, respectively, against isolates that are representative of RYMV genetic and pathogenic diversity. Our study revealed a hypervirulent pathotype, named thereafter pathotype T9, that is able to overcome all known sources of high resistance. This pathotype, which is spatially localized in West-Central Africa, appears to be more abundant than previously suspected. To better understand the adaptive processes of pathotype T9, molecular determinants of resistance breakdown were identified via Sanger sequencing and validated through directed mutagenesis of an infectious clone. These analyses confirmed the key role of convergent nonsynonymous substitutions in the central part of the viral genome-linked protein to overcome RYMV1-mediated resistance. In addition, deep-sequencing analyses revealed that resistance breakdown does not always coincide with fixed mutations. Actually, virulence mutations that are present in a small proportion of the virus population can be sufficient for resistance breakdown. Considering the spatial distribution of RYMV strains in Africa and their ability to overcome the RYMV resistance genes and alleles, we established a resistance-breaking risk map to optimize strategies for the deployment of sustainable and resistant rice lines in Africa.First reported 50 years ago, Rice yellow mottle virus (RYMV) is a major biotic constraint to rice cultivation in Africa (Séré et al. 2013). RYMV is a viral species of genus Sobemovirus that is responsible for high rice production losses in agroecosystems in most rice-growing countries of Africa (Kouassi et al. 2005;Traoré et al. 2015). Highly adapted to the two cultivated rice species, Asian rice Oryza sativa and African rice O. glaberrima, RYMV has a narrow host range that also includes other wild Poaceae species (Bakker 1974). RYMV possesses a single-stranded RNA genome that is organized into five open reading frames (ORF) (Fig. 1A). Highly diverse, RYMV is classified into six major strains with a strong geographical distribution. Strains S1 and S2/S3 are found in West and West-Central Africa whereas strains S4, S5, and S6 are present exclusively in East Africa (Pinel-Galzi et al. 2015). This spatial pattern of RYMV diversity is explained by the absence of seedborne transmission and of long-distance movement (Allarangaye et al. 2006;Fargette et al. 2006;Konaté et al. 2001). In addition to short-distance propagation that is mainly mediated by beetles, RYMV is transmitted by contact during agricultur...

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Rice seedbeds as a source of primary infection by Rice yellow mottle virus

Cited by 30 publications

References 13 publications

Farmers’ rice knowledge and adoption of new cultivars in the Tillabéry region of western Niger

Farmers’ rice knowledge and adoption of new cultivars in the Tillabéry region of western Niger

Farmers’ Perception and Impact of Rice Yellow Mottle Disease on Rice Yields in Burkina Faso

Identification of a Hypervirulent Pathotype of Rice yellow mottle virus: A Threat to Genetic Resistance Deployment in West-Central Africa

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