基于线粒体COI基因的雷州半岛马尾藻属常见种DNA条形码鉴定及系统进化分析DNA Barcoding and Phylogenetic Analysis of Common Species of Sargassum from Leizhou Peninsula Based on mt DNA-COI Gene Sequences
贺亮,廖健,全秋梅,梁忠,谢恩义,刘丽,刘楚吾
摘要(Abstract):
采用DNA条形码技术辅以传统形态分类方法,对雷州半岛马尾藻属(Sargassum)6常见种进行物种鉴定和系统进化分析。测得6种马尾藻线粒体COI基因序列,该序列与Gen Bank和BOLD数据库中马尾藻序列同源性均大于或等于99%,该结果与形态分类学鉴定结果一致。COI基因序列特征分析表明,6种马尾藻保守位点421个,变异位点58个,简约信息位点21个,单一突变位点37个,变异率7.7%,T、C、A、G平均含量分别为39.1%、18.9%、19.1%、22.9%,A+T含量(58.2%)高于C+G含量(41.8%),UUU所编码的苯丙氨酸(F)使用频率最高,达12.5%,最大似然法估算的转换颠换比值为2.42,种间遗传距离多在0.030±0.013~0.100±0.016之间。聚类分析结果与形态学鉴定、同源性分析结果一致。
关键词(KeyWords): 马尾藻属;mtDNA-COI基因;物种鉴定;分子系统进化;DNA条形码
基金项目(Foundation): 2016年度广东大学生科技创新培育专项资金立项项目(pdjh2016b0236);; 中央分成海域使用金支出项目(2011-2-2-09-3);; 广东省海洋渔业科技推广专项(A201308E02);; 广东省科技计划项目(2012B020307006)
作者(Author): 贺亮,廖健,全秋梅,梁忠,谢恩义,刘丽,刘楚吾
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