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Journal articles on the topic 'Rice Yellow Mottle Virus[RYMV]'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Salaudeen, M. T. "Relative resistance to Rice yellow mottle virus in rice ." Plant Protection Science 50, No. 1 (2014): 1–8. http://dx.doi.org/10.17221/61/2012-pps.

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We identified sources of&nbsp;Rice yellow mottle virus&nbsp;(RYMV) resistance in rice cultivars. Eight cultivars together with susceptible and resistant controls were evaluated under screenhouse conditions as inoculated and uninoculated treatment in completely randomised design with three replications. Seedlings were inoculated with the virus by sap transmission at two weeks after sowing. Disease incidence and severity (scale 1&ndash;9: 1&ndash;3 = green leaves with sparse dots or streaks, 9 = yellow or orange leaves and some plant dead), yield, and agronomic traits were record

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2

Koudamiloro, Augustin, Francis Eegbara Nwilene, Abou Togola, and Martin Akogbeto. "Insect Vectors of Rice Yellow Mottle Virus." Journal of Insects 2015 (February 2, 2015): 1–12. http://dx.doi.org/10.1155/2015/721751.

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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 o

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3

Uke, Ayaka, Naswiru Tibanyendela, Ryoichi Ikeda, Azusa Fujiie, and Keiko Teresa Natsuaki. "Modes of transmission and stability of Rice yellow mottle virus." Journal of Plant Protection Research 54, no. 4 (2014): 363–66. http://dx.doi.org/10.2478/jppr-2014-0054.

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Abstract Rice yellow mottle virus (RYMV) is the most important rice virus in Africa. We examined RYMV transmission via soil and water contaminated with RYMV-infected rice plants and by serial cutting with RYMV-contaminated scissors. Transmission of RYMV via dried rice straw kept at 27°C was also examined. The results showed the virus could be transmitted via soil and water, and by scissors. Rice straw that was RYMV-infected was not infective if it was dried and was kept longer than 42 days. By insect transmission experiments and ELISA, long-horned grasshoppers (Conocephalus spp.) were found to

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4

Abubakar, Zakia, Fadhila Ali, Agnes Pinel, et al. "Phylogeography of Rice yellow mottle virus in Africa." Journal of General Virology 84, no. 3 (2003): 733–43. http://dx.doi.org/10.1099/vir.0.18759-0.

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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

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5

Pinel-Galzi, A., D. Fargette, and R. Hull. "First Report of Rice yellow mottle virus in Rice in Uganda." Plant Disease 90, no. 5 (2006): 683. http://dx.doi.org/10.1094/pd-90-0683b.

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Rice yellow mottle virus (RYMV) of the genus Sobemovirus is a major biotic constraint to rice production in Africa. First reported in Kenya in 1966, RYMV was later found in most countries in Africa where rice (Oryza sativa) is grown (2). During July 2000, plants with leaf yellowing and mottling symptoms were observed in Uganda in a subsistence rice field northeast of Lake Victoria, close to the Nile River. RYMV was detected by using enzyme-linked immunosorbent assay with polyclonal RYMV antisera (1) in the four samples collected. Discriminant monoclonal antibodies revealed that the samples con

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6

Sere, Y., F. Sorho, A. Onasanya, et al. "First Report of Rice yellow mottle virus in Rice in The Gambia." Plant Disease 92, no. 2 (2008): 316. http://dx.doi.org/10.1094/pdis-92-2-0316b.

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Rice yellow mottle virus (RYMV) of the genus Sobemovirus is a major biotic constraint to rice (Oryza sativa) production in Africa. First reported in Kenya during 1966, RYMV was later found in most countries in Africa where rice is grown (1). In countries in westernmost Africa (The Gambia, Guinea-Bissau, Mauritania, and Senegal), plants with leaf yellowing and mottling symptoms were observed, but RYMV was never isolated. Rice is the staple food in The Gambia. In 2006, four samples were collected from local rice varieties in the Kuntaur Region in the center of The Gambia. Mechanical inoculation

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7

Traoré, O., A. Pinel, D. Fargette, and G. Konaté. "First Report and Characterization of Rice yellow mottle virus in Central Africa." Plant Disease 85, no. 8 (2001): 920. http://dx.doi.org/10.1094/pdis.2001.85.8.920a.

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Rice yellow mottle virus (RYMV) of the genus Sobemovirus is the main virus infecting rice (Oryza sativa) in Africa. First reported in Kenya (East Africa), RYMV was later found in most countries of East and West Africa where rice is grown, and in Madagascar in the Indian Ocean. In Central Africa however, the disease had never been reported in rice fields. Ninety-eight field samples with typical yellow mottle symptoms from cultivated rice and two wild rice species (Oryza longistaminata and O. barthii) were collected in the Soudano-Sahelian zones, in the north of Cameroon and the south of Chad (C

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8

Ndikumana, I., A. Pinel-Galzi, Z. Negussie, et al. "First Report of Rice yellow mottle virus on Rice in Burundi." Plant Disease 96, no. 8 (2012): 1230. http://dx.doi.org/10.1094/pdis-03-12-0293-pdn.

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Since the mid-1980s, rice cultivation has expanded rapidly in Burundi to reach approximately 50,000 ha in 2011. In 2007, leaf mottling, reduced tillering, and stunting symptoms were observed on rice at Gatumba near Bujumbura, causing small patches in less than 10% of the fields. Rice yellow mottle virus (RYMV, genus Sobemovirus), which has seriously threatened rice cultivation in Africa (1) and was recently described in the neighboring Rwanda (3), was suspected to be involved because of similar symptoms. To identify the pathogen that caused the disease in Burundi, a survey was performed in the

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9

Hébrard, Eugénie, Agnès Pinel-Galzi, Aderonke Oludare, et al. "Identification of a Hypervirulent Pathotype of Rice yellow mottle virus: A Threat to Genetic Resistance Deployment in West-Central Africa." Phytopathology® 108, no. 2 (2018): 299–307. http://dx.doi.org/10.1094/phyto-05-17-0190-r.

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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

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10

Abo, M. E., M. D. Alegbejo, and A. A. Sy. "Field incidence of rice yellow mottle virus, genus sobemovirus on rice and a weed species in the field in Cote d'Ivoire." Acta Agronomica Hungarica 50, no. 1 (2002): 85–89. http://dx.doi.org/10.1556/aagr.50.2002.1.10.

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Field surveys carried out between 1996 and 1997 in Cote d'Ivoire on weed hosts to detect the occurrence and subsistence of rice yellow mottle virus (RYMV) in nature show that rice and Echinochloa crus-pavonis (Link) harbour the virus. There was consistent detection of RYMV throughout the sampling period in rice samples mostly from the lowland varieties. It is thus evident that RYMV subsists more on rice in nature. This could serve as a source of inoculum for infection to newly transplanted rice in the field.

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11

Banwo, O. O., M. D. Alegbejo, and M. E. Abo. "Rice yellow mottle virus genus Sobemovirus: a continental problem in africa." Plant Protection Science 40, No. 1 (2010): 26–36. http://dx.doi.org/10.17221/1350-pps.

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<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 mecha

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12

Longué, D. R. S., A. Galzi-Pinel, S. Semballa, I. Zinga, D. Fargette, and O. Traoré. "First Report of Rice yellow mottle virus in Rice in the Central African Republic." Plant Disease 98, no. 1 (2014): 162. http://dx.doi.org/10.1094/pdis-04-13-0418-pdn.

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Rice yellow mottle virus (RYMV, genus Sobemovirus) is a major biotic constraint to rice production in Africa. First reported in Kenya in 1966, RYMV was later found in most countries in Africa where rice (Oryza sativa, O. glaberrima) is grown (4). In the Central African Republic, the disease has never been reported in rice fields. In October 2011, plants with leaf yellowing and mottling symptoms were observed in large irrigated rice production schemes about 30 km west of Bangui, the capital of the Central African Republic, and in lowland subsistence fields in Bangui outskirts. Disease incidence

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13

Pinto, Yvonne M., Rosan A. Kok, and David C. Baulcombe. "Resistance to rice yellow mottle virus (RYMV) in cultivated African rice varieties containing RYMV transgenes." Nature Biotechnology 17, no. 7 (1999): 702–7. http://dx.doi.org/10.1038/10917.

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14

Orjuela, Julie, E. F. Thiémélé Deless, Olufisayo Kolade, Sophie Chéron, Alain Ghesquière, and Laurence Albar. "A Recessive Resistance to Rice yellow mottle virus Is Associated with a Rice Homolog of the CPR5 Gene, a Regulator of Active Defense Mechanisms." Molecular Plant-Microbe Interactions® 26, no. 12 (2013): 1455–63. http://dx.doi.org/10.1094/mpmi-05-13-0127-r.

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RYMV2 is a major recessive resistance gene identified in cultivated African rice (Oryza glaberrima) which confers high resistance to the Rice yellow mottle virus (RYMV). We mapped RYMV2 in an approximately 30-kb interval in which four genes have been annotated. Sequencing of the candidate region in the resistant Tog7291 accession revealed a single mutation affecting a predicted gene, as compared with the RYMV-susceptible O. glaberrima CG14 reference sequence. This mutation was found to be a one-base deletion leading to a truncated and probably nonfunctional protein. It affected a gene homologo

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15

Suvi, William Titus, Hussein Shimelis, Mark Laing, Isack Mathew, and Admire I. T. Shayanowako. "Variation among Tanzania Rice Germplasm Collections Based on Agronomic Traits and Resistance to Rice Yellow Mottle Virus." Agronomy 11, no. 2 (2021): 391. http://dx.doi.org/10.3390/agronomy11020391.

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Rice (Oryza species) is a commercial crop worldwide. Across Africa, the potential yield and quality of rice is diminished by a lack of high performance, locally adapted varieties, and the impact of rice yellow mottle virus (RYMV). The objective of this study was to assess the performance of a diverse collection of rice germplasm for RYMV resistance and agronomic traits, and to select promising lines for breeding for Tanzanian conditions. Fifty-four rice genotypes were field evaluated in two important rice production sites (Ifakara and Mkindo) in Tanzania, which are recognized as RYMV hotspots,

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16

Hubert, J. G., A. Pinel-Galzi, D. Dibwe, et al. "First Report of Rice yellow mottle virus on Rice in the Democratic Republic of Congo." Plant Disease 97, no. 12 (2013): 1664. http://dx.doi.org/10.1094/pdis-06-13-0650-pdn.

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Rice yellow mottle virus (RYMV), genus Sobemovirus, is a widespread rice pathogen reported in nearly all rice-growing countries of Africa. Although the virus was detected in Cameroon, Chad, Tanzania, Rwanda, Burundi, and Uganda (2,3), RYMV has never been described in the Democratic Republic of Congo (DRC). In July 2012, plants with leaf yellowing and mottling symptoms were observed in large irrigated rice production schemes 30 km south of Bukavu, in eastern DRC, and in lowland subsistence fields in the surroundings of Bukavu. Several dozen hectares affected by the disease were abandoned by the

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17

Fargette, Denis, Agnès Pinel, Zakia Abubakar, et al. "Inferring the Evolutionary History of Rice Yellow Mottle Virus from Genomic, Phylogenetic, and Phylogeographic Studies." Journal of Virology 78, no. 7 (2004): 3252–61. http://dx.doi.org/10.1128/jvi.78.7.3252-3261.2004.

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ABSTRACT Fourteen isolates of Rice yellow mottle virus (RYMV) were selected as representative of the genetic variability of the virus in Africa from a total set of 320 isolates serologically typed or partially sequenced. The 14 isolates were fully sequenced and analyzed together with two previously reported sequences. RYMV had a genomic organization similar to that of Cocksfoot mottle sobemovirus. The average nucleotide diversity among the 16 isolates of RYMV was 7%, and the maximum diversity between any two isolates was 10%. A strong conservative selection was apparent on both synonymous and

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18

Sarra, Soungalo, and Dick Peters. "Rice yellow mottle virus Is Transmitted by Cows, Donkeys, and Grass Rats in Irrigated Rice Crops." Plant Disease 87, no. 7 (2003): 804–8. http://dx.doi.org/10.1094/pdis.2003.87.7.804.

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Rice yellow mottle virus (RYMV), endemic in Africa, is believed to be spread by chrysomelid beetles, although the infections in a field often cannot be explained by the prevailing number of beetles. We show that the grass rat Arvicanthis niloticus, domestic cows (Bos spp.), and donkeys (Asinus spp.) are potent and efficient transmitters of RYMV. Spread of RYMV by rats was demonstrated in cage experiments wherein individual rats transmitted the virus from healthy to infected rice plants and confirmed in a field experiment. Experiments with cows and donkeys showed that they could transmit the vi

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19

Rakotomalala, M. R., B. B. Abera, A. Pinel-Galzi, J. Rakotoarisoa, D. Alemu, and D. Fargette. "First Report of Rice yellow mottle virus in Rice in Federal Democratic Republic of Ethiopia." Plant Disease 98, no. 10 (2014): 1449. http://dx.doi.org/10.1094/pdis-05-14-0531-pdn.

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Rice yellow mottle virus (RYMV, genus Sobemovirus) is a major biotic constraint to rice production in Africa. First reported in Kenya in 1966, RYMV was later found in most countries in Africa where rice (Oryza sativa, O. glaberrima) is grown (5). In the Federal Democratic Republic of Ethiopia, however, the disease has never been reported in rice fields. In September 2012, plants with leaf yellowing and mottling symptoms were observed near Bahir Dar and in the Fogera district in the northwestern part of the country during a joint survey of scientists from Madagascar (FOFIFA), Ethiopian Institut

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20

Alkali, G., M. D. Alegbejo, B. D. Kashina, and O. O. Banwo. "Analysis of Serological Variability and Hierarchical Distribution of Rice Yellow Mottle Sobemovirus Isolates in Northern Nigeria." International Letters of Natural Sciences 37 (April 2015): 1–9. http://dx.doi.org/10.18052/www.scipress.com/ilns.37.1.

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A panel of four monoclonal antibodies (MAbs) was used to study the immunological profile of Rice yellow mottle virus (RYMV) genus Sobemovirus. Serological profiles of 35 representative isolates of RYMV from Borno, Gombe, Kaduna, Kano, Niger, Sokoto and Zamfara states in Northern Nigeria. All the RYMV isolates were classified into three major serogroups (SG1, SG2 and SG3) and further separated into six subgroups (Sg1a, Sg1b, Sg2a, Sg2b, Sg3a and Sg3b). The results demonstrate a significant serological variability among RYMV isolates in Northern Nigeria. The hierarchical analysis of the serologi

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Fargette, D., A. Pinel, M. Rakotomalala, et al. "Rice Yellow Mottle Virus, an RNA Plant Virus, Evolves as Rapidly as Most RNA Animal Viruses." Journal of Virology 82, no. 7 (2008): 3584–89. http://dx.doi.org/10.1128/jvi.02506-07.

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ABSTRACT The rate of evolution of an RNA plant virus has never been estimated using temporally spaced sequence data, by contrast to the information available on an increasing range of animal viruses. Accordingly, the evolution rate of Rice yellow mottle virus (RYMV) was calculated from sequences of the coat protein gene of isolates collected from rice over a 40-year period in different parts of Africa. The evolution rate of RYMV was estimated by pairwise distance linear regression on five phylogeographically defined groups comprising a total of 135 isolates. It was further assessed from 253 is

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Banwo, O. O. "Rice Yellow Mottle Virus (RYMV) Disease: A National Problem in Tanzania." Acta Phytopathologica et Entomologica Hungarica 38, no. 1-2 (2003): 99–107. http://dx.doi.org/10.1556/aphyt.38.2003.1-2.12.

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23

Hébrard, Eugénie, Nils Poulicard, Clément Gérard, et al. "Direct Interaction Between the Rice yellow mottle virus (RYMV) VPg and the Central Domain of the Rice eIF(iso)4G1 Factor Correlates with Rice Susceptibility and RYMV Virulence." Molecular Plant-Microbe Interactions® 23, no. 11 (2010): 1506–13. http://dx.doi.org/10.1094/mpmi-03-10-0073.

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The adaptation of Rice yellow mottle virus (RYMV) to recessive resistance mediated by the rymv1-2 allele has been reported as a model to study the emergence and evolution of virulent variants. The resistance and virulence factors have been identified as eukaryotic translation initiation factor eIF(iso)4G1 and viral genome–linked protein (VPg), respectively, but the molecular mechanisms involved in their interaction are still unknown. In this study, we demonstrated a direct interaction between RYMV VPg and the central domain of rice eIF(iso)4G1 both in vitro, using recombinant proteins, and in

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24

Sarra, S., P. Oevering, S. Guindo, and D. Peters. "Wind-mediated spread of Rice yellow mottle virus (RYMV) in irrigated rice crops." Plant Pathology 53, no. 2 (2004): 148–53. http://dx.doi.org/10.1111/j.0032-0862.2004.00981.x.

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25

Sow, Mounirou, Marie-Noelle Ndjiondjop, Ibnou Dieng, Honore Kam, Olufisayo Kolade, and Mark Laing. "Interactions Between Rice yellow mottle virus (RYMV) Isolates and Rice Germplasm from Niger." Tropical Plant Pathology 40, no. 1 (2015): 35–45. http://dx.doi.org/10.1007/s40858-015-0006-z.

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Poulicard, Nils, Agnès Pinel-Galzi, Denis Fargette, and Eugénie Hébrard. "Alternative mutational pathways, outside the VPg, of rice yellow mottle virus to overcome eIF(iso)4G-mediated rice resistance under strong genetic constraints." Journal of General Virology 95, no. 1 (2014): 219–24. http://dx.doi.org/10.1099/vir.0.057810-0.

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The adaptation of rice yellow mottle virus (RYMV) to rymv1-mediated resistance has been reported to involve mutations in the viral genome-linked protein (VPg). In this study, we analysed several cases of rymv1-2 resistance breakdown by an isolate with low adaptability. Surprisingly, in these rarely occurring resistance-breaking (RB) genotypes, mutations were detected outside the VPg, in the ORF2a/ORF2b overlapping region. The causal role of three mutations associated with rymv1-2 resistance breakdown was validated via directed mutagenesis of an infectious clone. In resistant plants, these muta

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Koudamilor, A., F. E. Nwilene, D. Silue, et al. "Identification of Insect Vectors of Rice yellow mottle virus (RYMV) in Benin." Journal of Entomology 11, no. 3 (2014): 153–62. http://dx.doi.org/10.3923/je.2014.153.162.

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Traoré, Oumar, Agnès Pinel, Eugénie Hébrard, et al. "Occurrence of Resistance-Breaking Isolates of Rice yellow mottle virus in West and Central Africa." Plant Disease 90, no. 3 (2006): 259–63. http://dx.doi.org/10.1094/pd-90-0259.

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Rice yellow mottle virus (RYMV) is the most important rice-infecting virus in Africa. Highly resistant rice (Oryza spp.) cultivars Gigante and Tog5681 were challenged with virus isolates from five countries of the west and central African Sudano-savannah zone in order to investigate the occurrence and prevalence of resistance-breaking (RB) isolates. High resistance was overcome by 38.6% of the isolates. RB isolates could be divided into three main pathogenic groups. Isolates of the first group (17.5%) and of the second group (16.4%) were able to break down the resistance of Gigante only and of

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Ndjiondjop, M. N., L. Albar, D. Fargette, C. Fauquet, and A. Ghesquière. "The Genetic Basis of High Resistance to Rice Yellow Mottle Virus (RYMV) in Cultivars of Two Cultivated Rice Species." Plant Disease 83, no. 10 (1999): 931–35. http://dx.doi.org/10.1094/pdis.1999.83.10.931.

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Three cultivars of Oryza sativa (IR64, Azucena, and Gigante) and four cultivars of O. glaberrima (Tog5681, Tog5673, CG14, and SG329) were evaluated for their resistance to two isolates of rice yellow mottle virus (RYMV) by enzyme-linked immunosorbent assay (ELISA) and symptomatology. Cultivars Tog5681 and Gigante were highly resistant, and no symptoms were observed when either virus isolate was inoculated at 10 or 20 days postgermination and assayed by ELISA at 7, 14, 22, 35, 50, or 64 days postinoculation. Azucena showed a partial resistance, whereas the other cultivars were susceptible. Symp

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N'Guessan, P., A. Pinel, A. A. Sy, A. Ghesquière, and D. Fargette. "Distribution, Pathogenicity, and Interactions of Two Strains of Rice yellow mottle virus in Forested and Savanna Zones of West Africa." Plant Disease 85, no. 1 (2001): 59–64. http://dx.doi.org/10.1094/pdis.2001.85.1.59.

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In Côte d'Ivoire, the S2 strain of Rice yellow mottle virus (RYMV) predominated in the forested zones, including the “rice belt” to the west, in each of the cropping systems where rice was grown. The S1 strain occurred more frequently in the northern Guinean savanna, and only S1 isolates were found further north in the Sahelo-Soudanian zones. In mixed infection, S2 dominated over S1 both in viral capsid and RNA contents under temperature regimes encompassing those observed in savanna and forested zones of Côte d'Ivoire. There was no evidence of interactions in virus accumulation between the We

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Anato, Vital Kouessi Sixte, Yves Agnoun, Joèl Houndjo, et al. "Resistance of Oryza sativa and Oryza glaberrima Genotypes to RBe24 Isolate of Rice Yellow Mottle Virus in Benin and Effects of Silicon on Host Response." Plant Pathology Journal 37, no. 4 (2021): 375–88. http://dx.doi.org/10.5423/ppj.oa.09.2020.0180.

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Rice yellow mottle virus (RYMV) is the most harmful virus that affects irrigated and lowland rice in Africa. The RBe24 isolate of the virus is the most pathogenic strain in Benin. A total of 79 genotypes including susceptible IR64 (Oryza sativa) and the resistant TOG5681 (O. glaberrima) as checks were screened for their reactions to RBe24 isolate of RYMV and the effects of silicon on the response of host plants to the virus investigated. The experiment was a three-factor factorial consisting of genotypes, inoculation level (inoculated vs. non-inoculated), and silicon dose (0, 5, and 10 g/plant

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Suvi, William Titus, Hussein Shimelis, Mark Laing, Isack Mathew, and Admire I. T. Shayanowako. "Determining the Combining Ability and Gene Action for Rice Yellow Mottle Virus Disease Resistance and Agronomic Traits in Rice (Oryza sativa L.)." Agronomy 11, no. 1 (2020): 12. http://dx.doi.org/10.3390/agronomy11010012.

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Selecting genetically diverse and complementary parental lines and superior crosses are pre-requisites in developing improved cultivars. The objectives of this study were to determine the combining ability effects and gene action conditioning rice yellow mottle virus disease (RYMVD) resistance and agronomic traits in rice (Oryza sativa L.). Ten parental lines and their 45 F2 progenies were field evaluated in three locations using a 5 × 11 alpha lattice design with two replications. The genotype × site interaction effects were significant (p < 0.05) for the number of tillers (NT), number of

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Sérémé, Drissa, Séverine Lacombe, Moumouni Konaté, et al. "Sites under positive selection modulate the RNA silencing suppressor activity of rice yellow mottle virus movement protein P1." Journal of General Virology 95, no. 1 (2014): 213–18. http://dx.doi.org/10.1099/vir.0.057026-0.

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RNA silencing is a eukaryotic mechanism for RNA-based gene regulation that plays an essential role in diverse biological processes, such as defence against viral infections. The P1 of rice yellow mottle virus (RYMV) is a movement protein and displays RNA silencing suppression activity with variable efficiency, depending on the origin of the isolates. In this study, the positive selection pressure acting on the P1 protein gene was assessed. A site-by-site analysis of the d N/d S ratio was performed and 18 positively selected sites were identified. Four of these were mutated, and the ability to

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34

J. T., Onwughalu, Abo M. E, Nwankiti A. O., and Okoro J. K. "Application of Eco-Engineering Approach for Management of Rice Yellow Mottle Virus (RYMV) in Lowland Rice Ecology." BADEGGI JOURNAL OF AGRICULTURAL RESEARCH AND ENVIRONMENT 1, no. 1 (2019): 45–57. http://dx.doi.org/10.35849/bjare201901006.

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35

Sere, Y., S. Issaka, A. Onasanya, et al. "Existence of Several Pathotypes among Rice Yellow Mottle Virus (RYMV) Isolates Collected in Niger Republic." Trends in Applied Sciences Research 7, no. 1 (2012): 32–45. http://dx.doi.org/10.3923/tasr.2012.32.45.

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36

Nwilene, E. E. "Current Status and Management of Insect Vectors of Rice Yellow Mottle Virus (RYMV) in Africa." International Journal of Tropical Insect Science 19, no. 2-3 (1999): 179–85. http://dx.doi.org/10.1017/s1742758400019445.

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37

Siddiqui, Shahid Aslam, Cecilia Sarmiento, Erkki Truve, Harry Lehto, and Kirsi Lehto. "Phenotypes and Functional Effects Caused by Various Viral RNA Silencing Suppressors in Transgenic Nicotiana benthamiana and N. tabacum." Molecular Plant-Microbe Interactions® 21, no. 2 (2008): 178–87. http://dx.doi.org/10.1094/mpmi-21-2-0178.

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RNA silencing suppressor genes derived from six virus genera were transformed into Nicotiana benthamiana and N. tabacum plants. These suppressors were P1 of Rice yellow mottle virus (RYMV), P1 of Cocksfoot mottle virus, P19 of Tomato bushy stunt virus, P25 of Potato virus X, HcPro of Potato virus Y (strain N), 2b of Cucumber mosaic virus (strain Kin), and AC2 of African cassava mosaic virus (ACMV). HcPro caused the most severe phenotypes in both Nicotiana spp. AC2 also produced severe effects in N. tabacum but a much milder phenotype in N. benthamiana, although both HcPro and AC2 affected the

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Ghesquière, A., L. Albar, M. Lorieux, et al. "A Major Quantitative Trait Locus for Rice Yellow Mottle Virus Resistance Maps to a Cluster of Blast Resistance Genes on Chromosome 12." Phytopathology® 87, no. 12 (1997): 1243–49. http://dx.doi.org/10.1094/phyto.1997.87.12.1243.

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Two doubled-haploid rice populations, IR64/Azucena and IRAT177/ Apura, were used to identify markers linked to rice yellow mottle virus (RYMV) resistance using core restriction fragment length polymorphism (RFLP) maps. Resistance was measured by mechanical inoculation of 19-day-old seedlings followed by assessment of virus content by enzyme-linked immunosorbent assay tests 15 days after inoculation. IR64/Azucena and IRAT177/Apura populations, 72 and 43 lines, respectively, were evaluated, and resistance was found to be polygenic. Resistance was expressed as a slower virus multiplication, low s

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39

Abo, M. E., A. A. Sy, and M. D. Alegbejo. "Rice Yellow Mottle Virus (RYMV) in Africa: Evolution, Distribution, Economic Significance on Sustainable Rice Production and Management Strategies." Journal of Sustainable Agriculture 11, no. 2-3 (1997): 85–111. http://dx.doi.org/10.1300/j064v11n02_08.

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40

Odedara, O. O., K. O. Ademolu, and E. I. Ayo-John. "Prevalence of Rice Yellow Mottle Virus (RYMV) on Rice Plants Grown in Selected Farms in Ogun State: Preliminary Results." Nigerian Journal of Biotechnology 31, no. 1 (2016): 96. http://dx.doi.org/10.4314/njb.v31i1.13.

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41

Nwilene, F. E., A. K. Traore, A. N. Asidi, Y. Sere, A. Onasanya, and M. E. Abo. "New Records of Insect Vectors of Rice Yellow Mottle Virus (RYMV) in Cote d`Ivoire, West Africa." Journal of Entomology 6, no. 4 (2009): 189–97. http://dx.doi.org/10.3923/je.2009.189.197.

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42

Nwilene, F. E., A. K. Traore, A. N. Asidi, Y. Sere, A. Onasanya, and M. E. Abo. "New Records of Insect Vectors of Rice Yellow Mottle Virus (RYMV) in Cote d`Ivoire, West Africa." Journal of Entomology 6, no. 4 (2009): 198–206. http://dx.doi.org/10.3923/je.2009.198.206.

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43

Quilis, Jordi, Gisela Peñas, Joaquima Messeguer, Christophe Brugidou, and Blanca San Segundo. "The Arabidopsis AtNPR1 Inversely Modulates Defense Responses Against Fungal, Bacterial, or Viral Pathogens While Conferring Hypersensitivity to Abiotic Stresses in Transgenic Rice." Molecular Plant-Microbe Interactions® 21, no. 9 (2008): 1215–31. http://dx.doi.org/10.1094/mpmi-21-9-1215.

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The nonexpressor of pathogenesis-related (PR) genes (NPR1) protein plays an important role in mediating defense responses activated by pathogens in Arabidopsis. In rice, a disease-resistance pathway similar to the Arabidopsis NPR1-mediated signaling pathway one has been described. Here, we show that constitutive expression of the Arabidopsis NPR1 (AtNPR1) gene in rice confers resistance against fungal and bacterial pathogens. AtNPR1 exerts its protective effects against fungal pathogens by priming the expression of salicylic acid (SA)-responsive endogenous genes, such as the PR1b, TLP (PR5), P

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Adur-Okello, Stella E., Simon Alibu, Jimmy Lamo, Moses Ekobu, and Michael H. Otim. "Farmers’ Knowledge and Management of Rice Diseases in Uganda." Journal of Agricultural Science 12, no. 12 (2020): 221. http://dx.doi.org/10.5539/jas.v12n12p221.

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Rice in the recent past has picked up as a food security and income generating crop among farming households in Uganda. Even though, the crop is playing a significant role in reducing food insecurity and poverty within the country, its productivity has remained constant and low at about 1.5 metric tonnes per hectare. Using cross-sectional data collected from rice farmers in Northern (Lira, Dokolo, Otuke and Alebtong Districts); Eastern (Iganga, Bugiri and Kamuli Districts) and Central (Kayunga District) regions of the country, this paper establishes farmers&rsquo; knowledge and management

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Soko, Dago Faustin, Koutoua Ayolie, N’dodo Boni Clovis Koffi, et al. "Impact of eight isolates of Rice Yellow Mottle Virus (RYMV) from Gagnoa (Côte d’Ivoire) on rice (Oryza sp) cultivars production." International Journal of Biological and Chemical Sciences 9, no. 5 (2016): 2459. http://dx.doi.org/10.4314/ijbcs.v9i5.17.

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Fatogoma, Sorho, Guinagui Ndoua Bertrand, Bolou B. Bolou Antoine, et al. "Response of 20 Rice Genotypes to the Rice yellow mottle virus (RYMV) under Natural Infection Conditions in the M'bé Valley of Côte d'Ivoire." International Journal of Sciences 8, no. 12 (2019): 1–8. http://dx.doi.org/10.18483/ijsci.2232.

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Hébrard, Eugénie, Agnès Pinel-Galzi, Anne Bersoult, Christelle Siré, and Denis Fargette. "Emergence of a resistance-breaking isolate of Rice yellow mottle virus during serial inoculations is due to a single substitution in the genome-linked viral protein VPg." Journal of General Virology 87, no. 5 (2006): 1369–73. http://dx.doi.org/10.1099/vir.0.81659-0.

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The recessive gene rymv-1, responsible for the high resistance of Oryza sativa ‘Gigante’ to Rice yellow mottle virus (genus Sobemovirus), was overcome by the variant CI4*, which emerged after serial inoculations of the non-resistance-breaking (nRB) isolate CI4. By comparison of the full-length sequences of CI4 and CI4*, a non-synonymous mutation was identified at position 1729, localized in the putative VPg domain, and an assay was developed based on this single-nucleotide polymorphism. The mutation G1729T was detected as early as the first passage in resistant plants and was found in all subs

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Taylor, D. R., and A. B. Jalloh. "Evaluation of a set of near isogenic lines (NILS) for rice yellow mottle virus (RYMV) resistance and farmers participatory varietal evaluation in Sierra Leone." African Journal of Agricultural Research 12, no. 13 (2017): 1149–57. http://dx.doi.org/10.5897/ajar2016.12089.

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Pidon, Hélène, Alain Ghesquière, Sophie Chéron, et al. "Fine mapping of RYMV3: a new resistance gene to Rice yellow mottle virus from Oryza glaberrima." Theoretical and Applied Genetics 130, no. 4 (2017): 807–18. http://dx.doi.org/10.1007/s00122-017-2853-0.

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Thiémélé, Deless, Arnaud Boisnard, Marie-Noëlle Ndjiondjop, et al. "Identification of a second major resistance gene to Rice yellow mottle virus, RYMV2, in the African cultivated rice species, O. glaberrima." Theoretical and Applied Genetics 121, no. 1 (2010): 169–79. http://dx.doi.org/10.1007/s00122-010-1300-2.

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