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Published online ahead of print on 29 April 2009 as doi:10.1099/vir.0.010769-0
Journal of General Virology 2009;90:2040.

A more recent version of this article appeared on August 1, 2009 J Gen Virol (2009), DOI 10.1099/vir.0.010769-0
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Effect of citrus hosts on the generation, maintenance and evolutionary fate of genetic variability of Citrus exocortis viroid (CEVd)

Lucía Bernad1, Núria Duran-Vila1,3 and Santiago F. Elena2

1 Instituto Valenciano de Investigaciones Agrarias;
2 Instituto de Biología Molecular y Celular de Plantas

3 E-mail: nduran{at}ivia.es

Citrus exocortis viroid (CEVd) populations are composed by 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 and 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 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 characteristic of the original Etrog citron host and (ii) the genetic diversity found after transmitting back to Etrog citron is undistinguishable from that characteristic of the ancestral Etrog citron population regardless the citrus plant from where 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.

Received 30 January 2009; accepted 25 April 2009.




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