First Report of <i>Rice yellow mottle virus</i> in Rice in the Central African Republic

Longue, Djimitri; Galzi-Pinel, A.; Semballa, Silla; Zinga, Innocent; Fargette, Denis; Traoré, Oumar

doi:10.1094/pdis-04-13-0418-pdn

Cited by 9 publications

(5 citation statements)

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“…Extensive diffusion dynamics further develop within and between Côte d’Ivoire and Mali, and also western locations including Sierra Leone and Guinea appear to be seeded from these countries, respectively. Recent years mark the arrival in the most eastern location (Central African Republic) ( Longué et al. , 2013 ).…”

Section: Resultsmentioning

confidence: 99%

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Host ecology determines the dispersal patterns of a plant virus

et al. 2015

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Since its isolation in 1966 in Kenya, rice yellow mottle virus (RYMV) has been reported throughout Africa resulting in one of the economically most important tropical plant emerging diseases. A thorough understanding of RYMV evolution and dispersal is critical to manage viral spread in tropical areas that heavily rely on agriculture for subsistence. Phylogenetic analyses have suggested a relatively recent expansion, perhaps driven by the intensification of agricultural practices, but this has not yet been examined in a coherent statistical framework. To gain insight into the historical spread of RYMV within Africa rice cultivations, we analyse a dataset of 300 coat protein gene sequences, sampled from East to West Africa over a 46-year period, using Bayesian evolutionary inference. Spatiotemporal reconstructions date the origin of RMYV back to 1852 (1791–1903) and confirm Tanzania as the most likely geographic origin. Following a single long-distance transmission event from East to West Africa, separate viral populations have been maintained for about a century. To identify the factors that shaped the RYMV distribution, we apply a generalised linear model (GLM) extension of discrete phylogenetic diffusion and provide strong support for distances measured on a rice connectivity landscape as the major determinant of RYMV spread. Phylogeographic estimates in continuous space further complement this by demonstrating more pronounced expansion dynamics in West Africa that are consistent with agricultural intensification and extensification. Taken together, our principled phylogeographic inference approach shows for the first time that host ecology dynamics have shaped the historical spread of a plant virus.

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Section: Resultsmentioning

confidence: 99%

“…We have assembled a RYMV sequence dataset by retrieving all publicly available ORF4 CP gene sequences from GenBank (on 4 September 2012) and combining these with additional samples made available by collaborators, which have now been published in recent studies ( Hubert et al. , 2013 ; Longué et al. , 2013 ).…”

Section: Methodsmentioning

confidence: 99%

Host ecology determines the dispersal patterns of a plant virus

et al. 2015

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“…In the Central African region (Cameroon and Chad), RYMV was identified for the first time in 2001 as described by Traoré et al [15]. Afterward, RYMV was observed in irrigated rice field around Bangui city in Central African Republic a ten years ago [4].…”

Section: Discussionmentioning

confidence: 91%

“…Member of genus Sobemovirus, RYMV was the first reported in Kenya in East Africa [1]. RYMV was found in most countries where rice is growing and also in the islands of Zanzibar and Madagascar [2] [3] and more recently in Chad, Cameroon, Central African Republic and Democratic Republic of Congo [4].…”

Section: Introductionmentioning

confidence: 99%

Detection and Serological Characterization of Rice Yellow Mottle Virus in Central African Republic

Longué¹,

Zinga²,

Semballa³

et al. 2016

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Serological and biological detection of Rice Yellow Mottle Virus (RYMV) in leaf samples belonging from cultivated rice species and wild grasses revealed 201 positive detections. All these isolates occurred exclusively on cultivated rice species (Oryza sativa L. and O. glaberrima Steud). A relationship was found between cultural practices and presence of RYMV in fields (χ² = 108.83, df = 1, P < 0.001). The serological characterization using Monoclonal antibodies (Mabs A and D), showed homogenous reaction with Mabs A alone. These results indicated that Ser1 serotype is present in the south of Central African Republic.

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“…It is the main viral disease of rice in Africa [9]. Since its discovery, RYMV has been reported also in most countries in Africa [10] like Sierra Leone, Ivory Coast [11], Nigeria [12], Tanzania, Zanzibar, Liberia [13], Burkina Faso, Mali [14], Niger [15], Guinea [16], Rwanda [17], Democratic Republic of Congo [18], and Central African Republic [19]. Thus far, RYMV is reported in 23 countries in Africa South of the Sahara [18][19][20][21] and in all rice ecosystems.…”

Section: Rice Yellow Mottle Virus (Rymv)mentioning

confidence: 99%

Insect Vectors of Rice Yellow Mottle Virus

et al. 2015

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Rice yellow mottle virus (RYMV) is the major viral constraint to rice production in Africa. RYMV was first identified in 1966 in Kenya and then later in most African countries where rice is grown. Several studies have been conducted so far on its evolution, pathogenicity, resistance genes, and especially its dissemination by insects. Many of these studies showed that, among RYMV vectors, insects especially leaf-feeders found in rice fields are the major source of virus transmission. Many studies have shown that the virus is vectored by several insect species in a process of a first ingestion of leaf material and subsequent transmission in following feedings. About forty insect species were identified as vectors of RYMV since 1970 up to now. They were essentially the beetles, grasshoppers, and the leafhoppers. For this review, we presented the chronology of their identification. Also, the biology, ecology, host range, distribution, and caused damage of these insects were briefly summarized.

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First Report of Rice yellow mottle virus in Rice in the Central African Republic

Cited by 9 publications

References 0 publications

Host ecology determines the dispersal patterns of a plant virus

Host ecology determines the dispersal patterns of a plant virus

Detection and Serological Characterization of Rice Yellow Mottle Virus in Central African Republic

Insect Vectors of Rice Yellow Mottle Virus

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