Facultad de Ciencias de la Vida, Escuela Superior Politécnica del Litoral, Guayaquil, Ecuador.
Centro de Investigaciones Biotecnológicas del Ecuador, Escuela Superior Politécnica del Litoral, Guayaquil, Ecuador.
Plant Dis. 2024 Mar;108(3):587-591. doi: 10.1094/PDIS-03-23-0445-SC. Epub 2024 Feb 29.
The occurrence of Schlumbergera virus X (SchVX) in commercial dragon fruit fields in three provinces of Ecuador has been identified in this study. The virus was found in symptomatic and asymptomatic cladodes of the two major species ( and . ) cultivated in the country. Symptoms in included irregular and ring-shaped chlorotic spots that coalesce into large chlorotic patches along the cladodes, whereas small chlorotic spot symptoms on the cladodes were observed in . Phylogenetic inferences based on 27 partial nucleotide sequences of the RNA-dependent RNA polymerase (RdRp) and three whole genome comparisons showed that Ecuadorean isolates from and share a most recent ancestor with isolates from Spain and Portugal. In addition, an SchVX isolate with a distinct genomic lineage was found in symptomatic plants from a single location, suggesting two independent virus introductions into the country.
本研究在厄瓜多尔三个省份的商业火龙果种植区发现了 Schlumbergera 病毒 X（SchVX）。该病毒存在于该国种植的两种主要火龙果品种（Hylocereus undatus 和 Selenicereus grandiflorus）的有症状和无症状的茎段中。在 H. undatus 中观察到的症状包括不规则和环状褪绿斑点，这些斑点沿着茎段融合成大的褪绿斑块，而在 S. grandiflorus 中观察到的则是小型褪绿斑点症状。基于 RNA 依赖性 RNA 聚合酶（RdRp）的 27 个部分核苷酸序列和三个全基因组比较的系统发育推断表明，来自厄瓜多尔的 H. undatus 和 S. grandiflorus 的分离株与来自西班牙和葡萄牙的分离株具有最近的共同祖先。此外，在来自单一地点的单个有症状的 S. grandiflorus 植物中发现了一个具有独特基因组谱系的 SchVX 分离株，表明该病毒有两次独立的传入该国。
