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高志鹏, 杨坤, 陈凯, 习丙文, 谢骏. 几种放射孢子虫的形态特征和分子鉴定[J]. 水生生物学报, 2021, 45(2): 446-454. DOI: 10.7541/2021.2019.264
引用本文: 高志鹏, 杨坤, 陈凯, 习丙文, 谢骏. 几种放射孢子虫的形态特征和分子鉴定[J]. 水生生物学报, 2021, 45(2): 446-454. DOI: 10.7541/2021.2019.264
GAO Zhi-Peng, YANG Kun, CHEN Kai, XI Bing-Wen, XIE Jun. MORPHOLOGICAL CHARACTERS AND DNA IDENTIFICATION OF SEVERAL ACTINOSPOREAN COLLECTED FROM OLIGOCHAETE BRANCHIURA SOWERBYI[J]. ACTA HYDROBIOLOGICA SINICA, 2021, 45(2): 446-454. DOI: 10.7541/2021.2019.264
Citation: GAO Zhi-Peng, YANG Kun, CHEN Kai, XI Bing-Wen, XIE Jun. MORPHOLOGICAL CHARACTERS AND DNA IDENTIFICATION OF SEVERAL ACTINOSPOREAN COLLECTED FROM OLIGOCHAETE BRANCHIURA SOWERBYI[J]. ACTA HYDROBIOLOGICA SINICA, 2021, 45(2): 446-454. DOI: 10.7541/2021.2019.264

几种放射孢子虫的形态特征和分子鉴定

MORPHOLOGICAL CHARACTERS AND DNA IDENTIFICATION OF SEVERAL ACTINOSPOREAN COLLECTED FROM OLIGOCHAETE BRANCHIURA SOWERBYI

  • 摘要: 为阐明黏孢子虫病的传播途径, 在2018—2019年期间作者调查了异育银鲫养殖池塘, 从底栖寡毛类苏氏尾鳃蚓中共检测出10种放射孢子虫。基于形态特征鉴定, 10种放射孢子虫分别属于6个集合类群, 其中雷氏放射孢子虫1种、桔瓣放射孢子虫2种、新放射孢子虫2种、三突放射孢子虫2种、棘放射孢子虫2种和匈牙利放射孢子虫1种; 这些物种中有4种与作者实验室前期描述种类一致, 5种为新发现的物种。研究描述了其形态特征并通过SSU rDNA序列比对分析对应的黏孢子虫种类。结果表明新发现的Triactinomyxon HZ和DF与文献中同类群的Triactinomyxon CZ (GenBank登录号 JX477771) 序列相似性最高(93.39%和94.48%), Echinactinomyxon LY1与金鱼肌肉寄生Myxobolus lentisuturalis (GenBank登录号AY119688)相似性最高(96.88%), Echinactinomyxon type LY2 与Hungactinomyxon (GenBank登录号 AY779062)相似性最高(97.86%), Neoactinomyxum type LY与文献报道的Thelohanellus sp. (GenBank登录号 MK412938)相似性最高(92.48%)。文章报道的Hungactinomyxon DF与匈牙利发现的Hungactinomyxon(GenBank登录号 AY779062)序列相似度达99.41%—99.64%, 为同一物种。系统发育分析表明文章所报道的Triactinomyxon HZ和DF与鱼体寄生四极虫亲缘关系较近; Hungactinomyxon DF 和Echinactinomyxon LY1及LY2与碘泡虫属亲缘关系较近; Neoactinomyxum LY与单极虫聚为一支。研究新报道的放射孢子虫进一步丰富了对养殖环境中黏孢子虫多样性的认识, 为开展黏孢子虫病生态防控奠定基础。

     

    Abstract: Myxozoans are common microparasites in wild and farmed fish, and some species cause severe disease in cultured gibel carp. During the investigation of actinospores in oligochaetes from the gibel carp ponds form April 2018 to July 2019, nine actinospore types were found in the oligochaete Branchiura sowerbyi Beddard. Based on morphological characteristics, they were identified into six collection groups, including one Raabeia-type, two Aurantiactinomyxon-types, two Neoactinomyxum-types, two Triactinomyxon-types, two Echinactinomyxon-types and one Hungactinomyxon-type. The present study described six of them, Triactinomyxon type HZ, Triactinomyxon type DF, Echinactinomyxon type LY1, Echinactinomyxon type LY2, Neoactinomyxum type LY1 and Hungactinomyxon type DF. Blastn search using SSU rDNA gene sequences indicated that Triactinomyxon type HZ and Triactinomyxon type DF have the highest 93.39% and 94.48% homology similarity with Triactinomyxon type CZ, respectively. Echinactinomyxon type LY1 and Myxobolus lentisuturalis have the highest similarity (96.88%, AY119688); Echinactinomyxon type LY2 has the highest similarity with Hungactinomyxon type 1 (97.86%, AY779062); Neoactinomyxum type LY has the highest similarity with Thelohanellus sp. (92.48%, MK412938); Hungactinomyxon type DF has the highest similarity with Hungactinomyxon (99.41%—99.64%). Phylogenetic analyses showed that Triactinomyxon type HZ and Triactinomyxon type DF clustered in the Chloromyxum subclade; Echinactinomyxon type LY1 and Echinactinomyxon type LY2 clustered in the Myxobolus clade; the Neoactinomyxum type LY1 clustered in the Thelohanellus clade.

     

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