Natural Recombination among Plant Virus Genomes: Evidence from Tobraviruses

MacFarlane, Stuart A.

doi:10.1006/smvy.1997.0103

Cited by 34 publications

(12 citation statements)

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“…Mixed infection of viruses in a single host plant is common in the field. In such mix-infected plants, genome reassortment events are fre- quently observed in viruses with segmented genomes, and these events have a strong impact on virus speciation (44,60 (46,65). It is believed that this particular nanovirus-like DNA component requires Cotton leaf curl begomovirus for encapsidation and transmission.…”

Section: Discussionmentioning

confidence: 99%

Reassortment and Concerted Evolution inBanana Bunchy Top VirusGenomes

Lin

et al. 2007

J Virol

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Section: Discussionmentioning

confidence: 99%

Reassortment and Concerted Evolution inBanana Bunchy Top VirusGenomes

Lin

et al. 2007

J Virol

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“…From a virological standpoint, variability in pathogenicity of ClYVV is not surprising, as plant RNA viruses typically have high mutation rates (Drake & Holland 1999; García‐Arenal et al. 2001), frequently exhibit recombination or pseudorecombination (MacFarlane 1997; García‐Arenal et al. 2001) and suffer population bottlenecks and genetic drift during transmission (García‐Arenal et al.…”

Section: Discussionmentioning

confidence: 99%

Do virus‐resistant plants pose a threat to non‐target ecosystems? I. Evidence from an Australian pathosystem based on glasshouse challenge experiments

et al. 2009

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One key environmental risk associated with the release of novel disease-resistant plants is the potential for non-target host populations to acquire resistance genes and undergo enemy release, leading to damage to associated native plant populations in high conservation-value ecosystems. Unfortunately, the dynamics of most natural pathosystems are poorly understood, and risk assessment of disease-resistant plants remains a challenge.Here we describe the first stage of a multi-tiered risk assessment strategy aimed at quantifying potential ecological release in a model pathosystem (the weedy pasture species Trifolium repens infected with Clover yellow vein virus; ClYVV) in order to assess the level of risk posed by genetically modified and conventionally bred disease-resistant host genotypes to non-target plant communities in south-eastern Australia. Glasshouse inoculation and growth experiments using 14 ClYVV isolates and 20 wild T. repens lines collected from high conservation-value montane grassland and woodland communities show that viral infection reduces the survival and growth of host plants by on average 10-50%. However, T. repens lines exhibited variable levels of resistance and tolerance to virus infection and ClYVV isolates differed in infectivity and aggressiveness, with grassland isolates having a greater pathogenic effect on associated host plants than woodland isolates.We conclude that ClYVV potentially plays an important role in limiting the size of T. repens populations in some at-risk non-target ecosystems and that second-tier field experiments are required to adequately quantify the risk associated with the commercial release of V-R T. repens genotypes in Australia.

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“…Recombination and reassortment are frequent in populations of plant-infecting viruses with either RNA or DNA genomes [2,5,10]. Analysis of their sequences indicates that both mechanisms contribute significantly to the generation of variability in the evolution and diversification of certain taxonomic groups [11][12][13][14][15][16]. Recombination and reassortment events may involve members of the same plant virus species [17][18][19], members of different species [20][21][22][23][24] or even genus [25].…”

Section: Generation and Modulation Of Genetic Diversity: Driving Forcmentioning

confidence: 99%

Diversity of Plant Virus Populations: A Valuable Tool for Epidemiological Studies

Escriu¹

2017

Genetic Diversity

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Plant viruses, as any other living organisms, differ genetically from each other as a result of processes (such as mutation, recombination and other forms of genetic exchange) that generate genetic variation in each generation during their reproduction and processes (such as selection, migration and genetic drift) that modulate this variation, determine the distribution of the genetic variants within a population (i.e., the genetic structure of the population) and how it changes with time, in a dynamical phenomenon called evolution. For plant viruses, evolutionary forces that generate and modulate the genetic diversity of their populations are often associated to different phases in their biology and ecology, such as virus-host interactions and host to host transmission. Forces that shape the evolution of plant viruses are at the same time key factors affecting their pathogenic properties, including their ability to cause diseases (an aspect that is studied in the field of epidemiology). The present chapter aims to illustrate how measurement and analysis of genetic diversity and structure of plant virus populations are essential to the current knowledge on the evolutionary biology of plant viruses and how evolutionary factors have a relevant role in the dynamics of virus populations and therefore, in the epidemiology of plant virus diseases.

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Natural Recombination among Plant Virus Genomes: Evidence from Tobraviruses

Cited by 34 publications

References 54 publications

Reassortment and Concerted Evolution inBanana Bunchy Top VirusGenomes

Reassortment and Concerted Evolution inBanana Bunchy Top VirusGenomes

Do virus‐resistant plants pose a threat to non‐target ecosystems? I. Evidence from an Australian pathosystem based on glasshouse challenge experiments

Diversity of Plant Virus Populations: A Valuable Tool for Epidemiological Studies

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