Effect of citrus hosts on the generation, maintenance and evolutionary fate of genetic variability of citrus exocortis viroid

Citrus exocortis viroid (CEVd) populations are composed of closely related haplotypes whose frequencies in the population result from the equilibrium between mutation, selection and genetic drift. The genetic diversity of CEVd populations infecting different citrus hosts was studied by comparing pop...

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Bibliographic Details
Published in:Journal of general virology 2009-08, Vol.90 (8), p.2040-2049
Main Authors: Bernad, Lucía, Duran-Vila, Núria, Elena, Santiago F
Format: Article
Language:English
Subjects:
Biological and medical sciences
Citrus - virology
Citrus exocortis viroid
Citrus limonia
Citrus sinensis
evolution
Evolution, Molecular
Fundamental and applied biological sciences. Psychology
Genetic Variation
infection
Microbiology
Miscellaneous
plant diseases and disorders
Poncirus trifoliata
population genetics
Sequence Analysis, DNA
Viroids - genetics
Viroids - isolation & purification
Virology
virus replication
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Summary:Citrus exocortis viroid (CEVd) populations are composed of closely related haplotypes whose frequencies in the population result from the equilibrium between mutation, selection and genetic drift. The genetic diversity of CEVd populations infecting different citrus hosts was studied by comparing populations recovered from infected trifoliate orange and sour orange seedling trees after 10 years of evolution, with the ancestral population maintained for the same period in the original host, Etrog citron. Furthermore, populations isolated from these trifoliate orange and sour orange trees were transmitted back to Etrog citron plants and the evolution of their mutant spectra was studied. The results indicate that (i) the amount and composition of the within-plant genetic diversity generated varies between these two hosts and is markedly different from that which is characteristic of the original Etrog citron host and (ii) the genetic diversity found after transmitting back to Etrog citron is indistinguishable from that which is characteristic of the ancestral Etrog citron population, regardless of the citrus plant from which the evolved populations were isolated. The relationship between the CEVd populations from Etrog citron and trifoliate orange, both sensitive hosts, and those from sour orange, which is a tolerant host, is discussed.
ISSN:0022-1317
1465-2099
DOI:10.1099/vir.0.010769-0