scholarly journals Insect Vectors of Rice Yellow Mottle Virus

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Augustin Koudamiloro ◽  
Francis Eegbara Nwilene ◽  
Abou Togola ◽  
Martin Akogbeto
Keyword(s):  
Host Range ◽  
Resistance Genes ◽  
Virus Transmission ◽  
Rice Production ◽  
Insect Species ◽  
Mottle Virus ◽  
Rice Yellow Mottle Virus ◽  
Insect Vectors ◽  
African Countries ◽  
Yellow Mottle

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.

New Records of Insect Vectors of Rice Yellow Mottle Virus (RYMV) in Cote d`Ivoire, West Africa

2009 ◽  
Vol 6 (4) ◽  
pp. 198-206 ◽  
Author(s):  
F.E. Nwilene ◽  
A.K. Traore ◽  
A.N. Asidi ◽  
Y. Sere ◽  
A. Onasanya ◽  
...  
Keyword(s):  
West Africa ◽  
New Records ◽  
Mottle Virus ◽  
Rice Yellow Mottle Virus ◽  
Insect Vectors ◽  
Yellow Mottle

scholarly journals Rice yellow mottle virus genus Sobemovirus: a continental problem in africa

2010 ◽  
Vol 40 (No. 1) ◽  
pp. 26-36 ◽  
Author(s):  
O.O. Banwo ◽  
M.D. Alegbejo ◽  
M.E. Abo
Keyword(s):  
Management Strategies ◽  
Central Africa ◽  
Mottle Virus ◽  
Future Research ◽  
Limiting Factor ◽  
Rice Yellow Mottle Virus ◽  
Virus Spread ◽  
Yield Losses ◽  
African Countries ◽  
Yellow Mottle

<I>Rice yellow mottle virus</I> genus <I>sobemovirus </I>(RYMV) was first reported in Kenya in 1966. The disease caused by this virus is fast becoming a major limiting factor in the rice production in Africa and neighbouring islands. It is known to occur in eastern, western and southern African countries and, since very recently, in Central Africa. It is transmitted by insect vectors such as <I>Chaectonema </I>spp., <I>Sesselia pusilla</I> Gerst. and <I>Trichispa sericea</I> Guerin (all <I>Coleoptera</I>) and also by mechanical means. About six strains of the virus now exist. Yield losses caused by the virus range from 20 to 100%. Integrated pest management has been suggested to minimise damage caused by this disease to rice. This paper reviews the characteristics of the virus, symptomatology, host range, distribution, strains, transmission, vector dynamics and virus spread, the economic importance, and management strategies. The need of future research of RYMV is also highlighted.

New Records of Insect Vectors of Rice Yellow Mottle Virus (RYMV) in Cote d`Ivoire, West Africa

2009 ◽  
Vol 6 (4) ◽  
pp. 189-197 ◽  
Author(s):  
F.E. Nwilene ◽  
A.K. Traore ◽  
A.N. Asidi ◽  
Y. Sere ◽  
A. Onasanya ◽  
...  
Keyword(s):  
West Africa ◽  
New Records ◽  
Mottle Virus ◽  
Rice Yellow Mottle Virus ◽  
Insect Vectors ◽  
Yellow Mottle

Host Range of Rice yellow mottle virus in Sudano-Sahelian Savannahs

2007 ◽  
Vol 10 (9) ◽  
pp. 1414-1421 ◽  
Author(s):  
M.D. Allarangay ◽  
O. Traore ◽  
E.V.S. Traore ◽  
R.J. Millogo ◽  
S. Guinko ◽  
...  
Keyword(s):  
Host Range ◽  
Mottle Virus ◽  
Rice Yellow Mottle Virus ◽  
Yellow Mottle

scholarly journals Insights Into Natural Genetic Resistance to Rice Yellow Mottle Virus and Implications on Breeding for Durable Resistance

2021 ◽  
Vol 12 ◽  
Author(s):  
Patrick J. Odongo ◽  
Geoffrey Onaga ◽  
Oliver Ricardo ◽  
Keiko T. Natsuaki ◽  
Titus Alicai ◽  
...  
Keyword(s):  
Resistance Genes ◽  
Durable Resistance ◽  
Translation Initiation Factor ◽  
Sub Saharan Africa ◽  
Initiation Factor ◽  
Mottle Virus ◽  
Rice Yellow Mottle Virus ◽  
Rice Varieties ◽  
Biotic Factor ◽  
Yellow Mottle

Rice is the main food crop for people in low- and lower-middle-income countries in Asia and sub-Saharan Africa (SSA). Since 1982, there has been a significant increase in the demand for rice in SSA, and its growing importance is reflected in the national strategic food security plans of several countries in the region. However, several abiotic and biotic factors undermine efforts to meet this demand. Rice yellow mottle virus (RYMV) caused by Solemoviridae is a major biotic factor affecting rice production and continues to be an important pathogen in SSA. To date, six pathogenic strains have been reported. RYMV infects rice plants through wounds and rice feeding vectors. Once inside the plant cells, viral genome-linked protein is required to bind to the rice translation initiation factor [eIF(iso)4G1] for a compatible interaction. The development of resistant cultivars that can interrupt this interaction is the most effective method to manage this disease. Three resistance genes are recognized to limit RYMV virulence in rice, some of which have nonsynonymous single mutations or short deletions in the core domain of eIF(iso)4G1 that impair viral host interaction. However, deployment of these resistance genes using conventional methods has proved slow and tedious. Molecular approaches are expected to be an alternative to facilitate gene introgression and/or pyramiding and rapid deployment of these resistance genes into elite cultivars. In this review, we summarize the knowledge on molecular genetics of RYMV-rice interaction, with emphasis on host plant resistance. In addition, we provide strategies for sustainable utilization of the novel resistant sources. This knowledge is expected to guide breeding programs in the development and deployment of RYMV resistant rice varieties.

Bionomics and importance of two species ofChaetocnema in rice yellow mottle virus transmission in lowland rice in Tanzania

2002 ◽  
Vol 30 (1) ◽  
pp. 96-104 ◽  
Author(s):  
O. O. Banwo ◽  
R. H. Makundi ◽  
R. S. Abdallah ◽  
J. C. Mbapila ◽  
F. M. Kimmins
Keyword(s):  
Virus Transmission ◽  
Lowland Rice ◽  
Mottle Virus ◽  
Rice Yellow Mottle Virus ◽  
Yellow Mottle

scholarly journals Phylogeography of Rice yellow mottle virus in Africa

2003 ◽  
Vol 84 (3) ◽  
pp. 733-743 ◽  
Author(s):  
Zakia Abubakar ◽  
Fadhila Ali ◽  
Agnes Pinel ◽  
Oumar Traoré ◽  
Placide N'Guessan ◽  
...  
Keyword(s):  
East Africa ◽  
Central Africa ◽  
Genetic Distances ◽  
Mottle Virus ◽  
Rice Yellow Mottle Virus ◽  
African Countries ◽  
West Central ◽  
Wide Range ◽  
Geographical Distances ◽  
Yellow Mottle

The sequences of the coat protein gene of a representative sample of 40 isolates of Rice yellow mottle virus (RYMV) from 11 African countries were analysed. The overall level of nucleotide diversity was high ( ∼14 %). Great geographical distances between the sites where isolates were collected were consistently associated with high genetic distances. In contrast, a wide range of genetic distances occurred among isolates spread over short geographical distances. There was no evidence of long-range dispersal. RYMV diversity in relation to land area was eight times greater in East Africa than in West/Central Africa. West/Central African isolates with up to 9 % divergence belonged to a monophyletic group, whereas the East African isolates with up to 13 % divergence fell into distantly related groups. In East Africa, each Tanzanian strain had a specific and restricted geographical range, whereas West/Central African strains had large and partially overlapping geographical distributions. Overall, our results suggest an earlier RYMV diversification in East Africa and a later radiation in West/Central Africa. The West African situation was consistent with virus adaptation to savanna, forest and other ecological conditions. In contrast East Africa, as exemplified by the Tanzanian situation, with numerous physical barriers (mountain chains, sea channel, lakes), suggested that RYMV strains resulted from divergence under isolated conditions. For RYMV and for two other viruses, phylogenetic relationships were established between isolates from Madagascar and isolates from the Lake Victoria region.

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