Modes of transmission and stability of Rice yellow mottle virus

Uke, Ayaka; Tibanyendela, Naswiru; Ikeda, Ryoichi; Fujiie, Azusa; Natsuaki, Keiko T.

doi:10.2478/jppr-2014-0054

Cited by 8 publications

(6 citation statements)

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“…Other secondary forms of RYMV transmission include farming implements, wind, irrigation water, and animals ( Traoré et al, 2009 ). Seedbed nurseries and infected crop stubble also serve as auxiliary sources of the virus ( Traoré et al, 2006b ; Uke et al, 2014 ).…”

Section: Rymv-host Plant Interactionmentioning

confidence: 99%

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

et al. 2021

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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.

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Section: Rymv-host Plant Interactionmentioning

confidence: 99%

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

et al. 2021

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“…It is transmitted by livestock as they graze from field to field (Ochola and Tusiime 2011), by insects (Koudamiloro et al 2015(Koudamiloro et al , 2019 and by wind (Sarra et al, 2004). Contaminated scissors with small blades can transmit the virus up to 12 seedlings during continuous cutting (Uke et al, 2014). The intensive usage of irrigation in rice cultivation is implicated to have enhanced growth and continuity of a wide range of weeds that act as alternative hosts and reservoirs from which the viral inoculum spreads to healthy rice crops (Okioma and Sarkarung 1983;Fargette et al, 2008;Traor e et al, 2009;Ochola and Tusiime 2011).…”

Section: Introductionmentioning

confidence: 99%

Assessment of Korean rice lines for their reaction to rice yellow mottle virus in Ghana

Asante

Amadu

Traoré

et al. 2020

Heliyon

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Rice yellow mottle virus (RYMV) is the most damaging viral disease of rice in Africa and can cause yield losses of up to 100%. The objective of this study was to characterize newly introduced rice lines from Korea into Ghana for their reaction to RYMV infection. One hundred and seventy-two rice lines from Korea were screened for their level of resistance RYMV in a screen house at Fumesua, Ghana. Four checks consisting of two highly resistant lines (Tog7291 and Gigante with rymv1-2 (resistant gene1-allele2) and rymv2 (resistant gene2) respectively), a moderately resistant line (CRI-Amankwatia) and a susceptible cultivar Jasmine 85 were used. The experiment was carried out in a 4 x 44 lattice design with four replicates. Screening for RYMV resistance was conducted by visual symptom scoring and virus-assessment through serology using enzyme linked immunosorbent assay (ELISA) test. Disease incidence and severity were assessed from 2 to 42 dpi. Data for disease severity and incidence were transformed (Log x+1) for ANOVA. Five lines (8261112, 8261119, 8261133, 8261588, and 8261634) were identified to be highly resistant to the disease just like Tog7291 and Gigante. The study also revealed 24 lines that were resistant but not grouping with Tog7291 and Gigante, whereas 100 moderately resistant lines clustered with the moderately resistance check CRI-Amankwatia in a distinct group. Forty-three (43) susceptible lines were identified with the susceptible check Jasmine 85 falling in this group. No highly susceptible line was identified. The newly idenfied resistant genotypes can be used by breeders to develop RYMV resistant varieties.

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“…During the maize phase of crop rotation, wet paddy soils are converted to dry uplands, so infected plant residues and rice stubble are kept dry for 3-4 months. RYMV infectivity diminishes when rice straw is kept dry for over 42 days (Uke et al 2014). Crop rotation can reduce the virus population by drying infected rice straw and stubble during maize production.…”

Section: Spatial Contiguity Of Rymv Aggravationmentioning

confidence: 99%

“…In seedbeds, close spacing facilitates biotic (insect) and abiotic (wind dispersal; Sarra et al 2004) RYMV transmission. Uprooting, bundling, and transplanting contaminate healthy rice seedlings and disseminate primary infection in the field (Traoré et al 2006;Traoré et al 2008;Uke et al 2014). The virus is transmitted from contaminated soils to healthy transplanted seedlings (Traoré et al 2008, Sarra 2005, with even a small volume able to transmit infection (Uke et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Uprooting, bundling, and transplanting contaminate healthy rice seedlings and disseminate primary infection in the field (Traoré et al 2006;Traoré et al 2008;Uke et al 2014). The virus is transmitted from contaminated soils to healthy transplanted seedlings (Traoré et al 2008, Sarra 2005, with even a small volume able to transmit infection (Uke et al 2014). Reverse viral transmission from the field to the environment also occurs via cows, donkeys, and other animals during harvest (Sarra and Peters 2003).…”

Section: Introductionmentioning

confidence: 99%

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Agronomic practices preventing local outbreaks of rice yellow mottle virus disease revealed by spatial autoregressive analysis

Sekiya

Nakajima

Oizumi

et al. 2022

Agron. Sustain. Dev.

Self Cite

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Rice yellow mottle virus (RYMV) causes severe rice (Oryza sativa L.) yield loss. It has been endemic to sub-Saharan Africa and Madagascar since 1966. Transmission (plant community level) and long-dispersal (regional and continental scale) models have been established but viral spread in farming communities continues, while the conditions causing local disease outbreaks remain unclear. We hypothesized that local outbreaks, comprising inter-plot virus spread and intra-plot disease aggravation, are significantly associated with individual farmers’ attributes and agronomic practices. To test this hypothesis, spatial autoregressive models were constructed using variables collected by visual observation and farmer interviews. Field surveys were conducted during four consecutive cropping seasons from 2011 to 2013 in the Lower Moshi Irrigation Scheme of Kilimanjaro, Tanzania. Our models detected spatial dependence in inter-plot virus spread, but not in intra-plot disease aggravation. The probability of inter-plot virus spread increased with use of the IR64 cultivar (26.9%), but decreased with straw removal (27.8%) and crop rotation (47.7%). The probability of intra-plot disease aggravation decreased with herbicide application (24.3%) and crop rotation (35.4%). A simple cost-benefit analysis suggested that inter-plot virus spread should be mitigated by cultivar replacement and straw removal. When disease severity is critical, intra-plot disease aggravation should be inhibited by herbicide application, and rice should be rotated with other crops. This is the first study to upscale the spatial autoregressive model from the experimental field level to the farming community level, by obtaining variables through easy-to-implement techniques such as visual observation and farmer interview. Our models successfully identified candidate agronomic practices for the control of RYMV. However, as the causal relationships between agronomic practices and RYMV outbreaks remain unknown, field trials are needed to develop robust control measures.

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Modes of transmission and stability of Rice yellow mottle virus

Cited by 8 publications

References 10 publications

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

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

Assessment of Korean rice lines for their reaction to rice yellow mottle virus in Ghana

Agronomic practices preventing local outbreaks of rice yellow mottle virus disease revealed by spatial autoregressive analysis

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