Regulatorische RNAs (MLU-assoziierte Gruppe)
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Serra, P.; BANI HASHEMIAN, S. M.; PENSABENE-BELLAVIA, G.; Gago, S.; DURAN-VILA, N.; An artificial chimeric derivative of Citrus viroid V involves the terminal left domain in pathogenicity Mol. Plant Pathol. 10, 515-522, (2009) DOI: 10.1111/j.1364-3703.2009.00553.x
The recently described Citrus viroid V (CVd‐V) induces, in Etrog citron, mild stunting and very small necrotic lesions and cracks, sometimes filled with gum. As Etrog citron plants co‐infected with Citrus dwarfing viroid (CDVd) and CVd‐V show synergistic interactions, these host–viroid combinations provide a convenient model to identify the pathogenicity determinant(s). The biological effects of replacing limited portions of the rod‐like structure of CVd‐V with the corresponding portions of CDVd are reported. Chimeric constructs were synthesized using a novel polymerase chain reaction‐based approach, much more flexible than those based on restriction enzymes used in previous studies. Of the seven chimeras (Ch) tested, only one (Ch5) proved to be infectious. Plants infected with Ch5 showed no symptoms and, although this novel chimera was able to replicate to relatively high titres in singly infected plants, it was rapidly displaced by either CVd‐V or CDVd in doubly infected plants. The results demonstrate that direct interaction(s) between structural elements in the viroid RNA (in this case, the terminal left domain) and as yet unidentified host factors play an important role in modulating viroid pathogenicity. This is the first pathogenic determinant mapped in species of the genus Apscaviroid.