浙江农业学报

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万代兰属植物rDNA ITS序列的克隆与分析

  

  1. (台州学院 生命科学学院,浙江 椒江 318000)
  • 出版日期:2015-08-25 发布日期:2015-08-21

Cloning and analysis of rDNA ITS sequences from Vanda plants#br#

  1. (College of Life Science, Taizhou University, Jiaojiang 318000, China)
  • Online:2015-08-25 Published:2015-08-21

摘要: 通过测定7种万代兰属植物的rDNA ITS序列,为该属植物的分子鉴定和遗传多样性研究奠定基础。以叶片基因组DNA为模板,利用PCR扩增7种万代兰属植物的ITS序列,在测序的基础上进行生物信息学分析。结果表明,ITS的全长为653~657 bp,其中58S和ITS2的长度十分保守,分别为163 和260 bp,ITS1的长度为230~234 bp。7种万代兰属植物的58S序列完全一致,而ITS1和ITS2序列中存在转换、颠换、插入/缺失现象。系统发育分析结果表明,7种植物的平均遗传距离为0021,它们在发育树上可分为3组。

关键词: 万代兰属, ITS序列, 克隆, 分子鉴定

Abstract: To provide evidences for molecular identification and genetic diversity studies, rDNA ITS sequences of 7 Vanda plants were isolated. ITS sequences were cloned by polymerase chain reaction using leaf genomic DNA as templates, and bioinformatic analysis was performed. Results indicated that the full length of ITS sequences ranged from 653 to 657 bp, and the sequences of 58S and ITS2 were conserved with an identical length of 163 and 260 bp, respectively; however, sequence length of ITS1 varied from 230-234 bp. The 58S sequences of 7 Vanda plants were identical, while some cases of transitions, transversion, and deletions/insertions were identified in both ITS1 and ITS2 sequences. Phylogenetic analysis results showed that the average genetic distance of 7 Vanda plants was 0021, and they were divided into 3 groups.

Key words: Vanda, ITS sequence, cloning, molecular identification