Genetic composition and complexity of virus populations at tungro-endemic and outbreak rice sites

Azzam, O.; Arboleda, M.; Umadhay, K. M. L.; Reyes, Jesús; Cruz, Fernando Silverio Ferreira Da; Mackenzie, A. M.; McNally, Kenneth L.

doi:10.1007/s007050070013

Cited by 14 publications

(11 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Azzam and co-workers have made a detailed analysis of the population structure of the viruses causing rice tungro in Southeast Asia. When the population structure of both viruses was analyzed in the same sample, population diversity for RTBV and RTSV did not correlate and a significant association was found among types of RTSV and the presence of RTBV (18). The same was found in similar analyses of RTBV (15,18).…”

Section: Genetic Structure Of Plant Virus Populationsmentioning

confidence: 77%

VARIABILITY AND GENETIC STRUCTURE OF PLANT VIRUS POPULATIONS

García‐Arenal

Fraile²,

Malpica³

2001

Annu. Rev. Phytopathol.

564

418

View full text Add to dashboard Cite

Populations of plant viruses, like all other living beings, are genetically heterogeneous, a property long recognized in plant virology. Only recently have the processes resulting in genetic variation and diversity in virus populations and genetic structure been analyzed quantitatively. The subject of this review is the analysis of genetic variation, its quantification in plant virus populations, and what factors and processes determine the genetic structure of these populations and its temporal change. The high potential for genetic variation in plant viruses, through either mutation or genetic exchange by recombination or reassortment of genomic segments, need not necessarily result in high diversity of virus populations. Selection by factors such as the interaction of the virus with host plants and vectors and random genetic drift may in fact reduce genetic diversity in populations. There is evidence that negative selection results in virus-encoded proteins being not more variable than those of their hosts and vectors. Evidence suggests that small population diversity, and genetic stability, is the rule. Populations of plant viruses often consist of a few genetic variants and many infrequent variants. Their distribution may provide evidence of a population that is undifferentiated, differentiated by factors such as location, host plant, or time, or that fluctuates randomly in composition, depending on the virus.

show abstract

Section: Genetic Structure Of Plant Virus Populationsmentioning

confidence: 77%

VARIABILITY AND GENETIC STRUCTURE OF PLANT VIRUS POPULATIONS

García‐Arenal

Fraile²,

Malpica³

2001

Annu. Rev. Phytopathol.

564

418

View full text Add to dashboard Cite

show abstract

“…One variant may be dominant and easily detected compared to another. A slight change in the dynamic of RTBV populations due to pressure in the environment and green leafhopper populations can lead to an outbreak (Arboleda and Azzam, 2000;Azzam et al, 2000). Phylogenetic analysis showing the genetic relationships between RTBV primary isolates from Bario, Sarawak and other RTBV isolates from SA and SEA available from NCBI GenBank database.…”

Section: Resultsmentioning

confidence: 99%

Molecular characterisation of rice tungro bacilliform virus isolated from Bario, Sarawak

Sia¹,

Siew²

2018

MJM

View full text Add to dashboard Cite

Aims: Rice tungro disease is one of the most damaging and destructive diseases of rice in South and Southeast Asia. The disease is caused by the co-infection of two viruses, the Rice tungro bacilliform virus (RTBV) and Rice tungro spherical virus (RTSV). The symptoms and severity of the disease depend on these two viral agents, if rice is coinfected by both viruses, it will show the typical severe symptoms of yellow-orange leaf discoloration, plant stunting and reduced in yield. On the other hand, if rice is infected only with RTBV, it shows milder symptoms and in contrast, rice plants will show no symptoms if they are infected only with RTSV. The disease had been detected in Malaysia since the 1930s. However, the first incursion of the disease was only reported in Sarawak in 2012. Since the disease was not seen in the Sarawak until recently, very little information on local virus isolate is available. This study was conducted to obtain and record the nucleotide sequence of partial coat protein gene of two primary isolates of RTBV collected from Bario, Sarawak in 2012 and 2013. Methodology and results: Based on the phylogenetic analysis, the isolates cluster with the Southeast Asia group with sequence identity at nucleotide and amino acid level of 91.1 to 95.1% and 98.6 to 99.5% respectively. Conclusion, significance and impact of study: This study provide the first genetic information on RTBV isolates from Sarawak. This data is important for future reference of the virus variants and diversity for epidemiological and diagnosis purposes.

show abstract

“…ns, non-significant; **significant (P < 0AE01). (Azzam et al, 2000;Bateson et al, 2002;Chin et al, 2007). It should be noted that the genetic flow between Andalucía and surrounding areas may be strongly constrained by mountain barriers.…”

Section: Discussionmentioning

confidence: 99%

Maize dwarf mosaic virus diversity in the Johnsongrass native reservoir and in maize: evidence of geographical, host and temporal differentiation

2010

View full text Add to dashboard Cite

The genetic diversity and population structure of Maize dwarf mosaic virus (MDMV) was examined by analysis of the full coat protein gene of 539 isolates collected from maize and Johnsongrass (Sorghum halepense) from eight different maizegrowing areas in Spain. Restriction fragment length polymorphism analysis revealed that the MDMV population consisted of 49 genetic variants, with the three most frequent accounting for 44% of the isolates. This population was spatially structured according to the establishment of maize crops in the area. The highest nucleotide diversity values were observed in the old maize-growing areas in the northeast of Spain (>0AE211) and the lowest in the new maize-growing areas in the west (<0AE019). Moreover, the major genetic variants differed between the old and new maize-growing areas. Evidence of hostassociated selection was found in the endemic area of the virus (Lleida), and aphid-transmission studies suggested vector selection pressure. Assessment of the temporal evolution of the MDMV population in northeastern areas indicated that time was only significant in Lleida, where it explained 4AE8% of the total variation over nine consecutive years.

show abstract

Genetic composition and complexity of virus populations at tungro-endemic and outbreak rice sites

Cited by 14 publications

References 26 publications

VARIABILITY AND GENETIC STRUCTURE OF PLANT VIRUS POPULATIONS

VARIABILITY AND GENETIC STRUCTURE OF PLANT VIRUS POPULATIONS

Molecular characterisation of rice tungro bacilliform virus isolated from Bario, Sarawak

Maize dwarf mosaic virus diversity in the Johnsongrass native reservoir and in maize: evidence of geographical, host and temporal differentiation

Contact Info

Product

Resources

About