DNA条形码技术在入侵植物刺萼龙葵检验检疫中的应用
2017-08-30田旭飞曲波
田旭飞+曲波
摘要:刺萼龙葵(Solanum rostratum)是危害严重的外来入侵植物,基于种子形态的传统检疫方法有一定的局限性,不依赖于形态学特征的DNA条形码技术是基于DNA序列差异对物种进行鉴定的新方法,是传统形态学鉴定方法的有力补充。以刺萼龙葵及其8种龙葵亚属近缘植物为材料,从GenBank数据库中下载rbcL、matK和内转录间隔区(ITS)序列,进行DNA条形码分析,结果显示ITS鉴定效果优于其他片段,可把刺萼龙葵从其近缘植物中鉴别出来。
关键词:刺萼龙葵;DNA条形码;ITS序列;入侵植物
中图分类号:S41-30文献标志码:A文章编号:1003-935X(2017)01-0030-06
Application of DNA Barcoding in Inspection and Quarantine of
the Invasive Plant Solanum rostratum
TIAN Xufei,QU Bo
(Bioscience and Biotechnology College,Shenyang Agricultural University,Shenyang 110866,China)
Abstract: Solanum rostratum is a seriously harmful invasive plant. The traditional method of identifying S. rostratum is by assessing its seed morphological characteristics,a procedure that cannot be realistically performed by customs officers because of many limitations. DNA barcoding is a technique for characterizing species of organisms using a short DNA sequence from a standard and agreed-upon position in the genome. As a powerful supplement to a conventional identification method,it is not affected by morphological traits of samples. In this study we downloaded rbcL,matK and ITS sequences for S. rostratum and its eight related species in Subg. Solanum from GenBank for DNA barcoding analyses. S. rostratum could be distinguished from its closely relative species with ITS being more effective than the other sequences at identifying the invasive plant.
Key words: Solanum rostratum;DNA barcoding;ITS sequence
收稿日期:2017-01-06
基金项目:辽宁省科学事业公益研究基金(编号:2015003013)
作者简介:田旭飞(1992—),男,贵州德江人,硕士,主要从事入侵生物学研究。
通信作者:曲 波,博士,教授,主要从事入侵生物学与生物多样性保护研究。E-mail:syau_qb@163.com。刺萼龙葵(Solanum rostratum Dunal)是茄科茄属龙葵亚属一年生杂草,别称黄花刺茄,原生于北美洲,现已广泛分布世界各地,被許多国家列为检疫性有害植物[1]。1981年刺萼龙葵首次在辽宁省朝阳县被发现[2],现已扩散至吉林、山西、新疆、内蒙古、河北和北京等地[3-4],已被我国列为检疫杂草。刺萼龙葵具有极强的适生性和繁殖能力,种子具有休眠性,能抵抗不良环境,一旦成功入侵,危害巨大,会严重抑制其他植物生长,降低生物多样性[5]。
预防是最好的防治,目前各国都很重视杂草检疫工作,但传统的形态鉴定方法难以满足现在的快速检疫需求,而一些先进的分子技术还未转变成切实可行的实践方法[6-7]。……
