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  • Title: A stable 463 nucleotide variant of citrus exocortis viroid produced by terminal repeats.
    Author: Semancik JS, Szychowski JA, Rakowski AG, Symons RH.
    Journal: J Gen Virol; 1994 Apr; 75 ( Pt 4)():727-32. PubMed ID: 8151291.
    Abstract:
    An unusual variant of citrus exocortis viroid (CEV) was detected when an inoculum source from Gynura aurantiaca D.C. was used to infect a hybrid tomato (Lycopersicon esculentum Mill. x L. peruvianum). The 92 nucleotide larger variant, CEV D-92, which displayed the characteristic circular and linear viroid structural forms, contained two repeated sequences spanning the V and T2 domains. A dramatic moderation of symptom expression in Gynura accompanied the incorporation of these repeated sequences. A comparison of the sequence and structure of CEV D-92 with coconut cadang-cadang viroid revealed similarities in the regions generating the naturally occurring terminal repeats suggesting a possible preferred site for RNA recombination between viroids.
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