The question of Citrus viroid IV as a Cocadviroid
The question of Citrus viroid IV as a Cocadviroid
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DOI：
10.1007/s00705-005-0499-8
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发表时间：
2005-06-01
影响因子：
2.7
通讯作者：
Vidalakis, G
中科院分区：
文献类型：
--
作者：
Semancik, JS;Vidalakis, G
柑桔类病毒IV（Citrus viroid IV，CVd-IV）被认为是拟椰壳病毒属的一个种。这种关系的基础上存在的一个终端保守的发夹（TCH）和终端保守区（TCR）的情况下，作为特定的结构基序在共同的椰子cadang-cadang类病毒（CCCVd）的分离株，以及系统发育关系的成员属椰子类。证据是一个“残留”的TCR在CVD-IV以及引入的末端重复区（TRR）的基序和替代序列分析，表明一个更密切的系统发育关系的CVD-IV的柑橘裂皮类病毒（CEVd），属内的一个物种比CCCVd。CVd-IV和CEVd之间生物学特性的惊人相似性进一步支持了这一立场，并建议考虑生物学证据对类病毒的任何总体分类方案进行具体调整。
It has been suggested that Citrus viroid IV (CVd-IV) be classified as a species within the genus Cocadviroid. This relationship was based on the presence of a terminal conserved hairpin (TCH) and absence of a terminal conserved region (TCR) as specific structural motifs in common with isolates of Coconut cadang-cadang viroid (CCCVd) as well as phylogenetic relationships with members of the genus Cocadviroid. Evidence is presented for a "vestigial" TCR in CVd-IV as well as the introduction of the terminal repeat region (TRR) motif and an alternative sequence analysis that suggests a closer phylogenetic relationship of CVd-IV to isolates of Citrus exocortis viroid (CEVd), a species within the genus Pospiviroid than to CCCVd. This position is further supported by the striking similarity of biological properties between CVd-IV and CEVd with the suggestion offered that biological evidence be considered for specific adjustments to any overall classification scheme for viroids.