Molecular characterization of CEVd strains that induce different phenotypes in Gynura aurantiaca : structure-pathogenicity relationships

Molecular characterization of CEVd strains that induce different phenotypes in Gynura aurantiaca... Two Citrus exocortis viroid isolates (CEVd-s and CEVd-129) that induce severe and mild symptoms in Gynura aurantiaca , respectively, have been characterized. They present nucleotide sequences in the pathogenicity motifs P L , C and P R similar to those of “Class A” and “Class B”. Infectivity and symptom expression in G. aurantica and tomato were evaluated with a selection of sequence variants recovered from both isolates. As expected, the two variants selected from CEVd-s induced severe symptoms. The variants selected from CEVd-129 induced mild symptoms, except one of them, named MJ, that presented an unusual genotype and induced severe symptoms in G. aurantiaca . The biological properties of MJ show that the two nucleotide changes of the C domain normally associated with the P L and P R motifs of “Class B” strains are not implicated in symptom expression. The relationship between “Class A” and “Class B” strains with the symptoms induced in clementine trees grafted on trifoliate orange is discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Virology Springer Journals

Molecular characterization of CEVd strains that induce different phenotypes in Gynura aurantiaca : structure-pathogenicity relationships

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Publisher
Springer Journals
Copyright
Copyright © 2007 by Springer-Verlag
Subject
Biomedicine; Virology; Medical Microbiology; Infectious Diseases
ISSN
0304-8608
eISSN
1432-8798
D.O.I.
10.1007/s00705-007-0958-5
Publisher site
See Article on Publisher Site

Abstract

Two Citrus exocortis viroid isolates (CEVd-s and CEVd-129) that induce severe and mild symptoms in Gynura aurantiaca , respectively, have been characterized. They present nucleotide sequences in the pathogenicity motifs P L , C and P R similar to those of “Class A” and “Class B”. Infectivity and symptom expression in G. aurantica and tomato were evaluated with a selection of sequence variants recovered from both isolates. As expected, the two variants selected from CEVd-s induced severe symptoms. The variants selected from CEVd-129 induced mild symptoms, except one of them, named MJ, that presented an unusual genotype and induced severe symptoms in G. aurantiaca . The biological properties of MJ show that the two nucleotide changes of the C domain normally associated with the P L and P R motifs of “Class B” strains are not implicated in symptom expression. The relationship between “Class A” and “Class B” strains with the symptoms induced in clementine trees grafted on trifoliate orange is discussed.

Journal

Archives of VirologySpringer Journals

Published: Jul 1, 2007

References

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