【摘 要】
：
对12种34个地理种群的内蒙古棘豆属植物核糖体ITS区段和5.8S基因序列进行比较分析,并采用Maximum Likelihood法构建系统发育树.结果表明:支持棘豆属植物为单系起源,支持《内
【机 构】
：
内蒙古师范大学 生命科学与技术学院,包钢十五中
论文部分内容阅读
对12种34个地理种群的内蒙古棘豆属植物核糖体ITS区段和5.8S基因序列进行比较分析,并采用Maximum Likelihood法构建系统发育树.结果表明:支持棘豆属植物为单系起源,支持《内蒙古植物志》将黄毛棘豆(Oxytropis ochrantha)、多叶棘豆(O.verticillaris)、二色棘豆(O.bicolor)和砂珍棘豆(O.racemosa)归入真棘豆亚属(Subgen.Euoxytropis)轮叶棘豆组(Sect.Baicalia Stell.ex Bunge)的观点.推测多叶棘豆和砂珍棘豆ITS2区段出现的C/T转换可能是其部分种群混杂在其他物种中的主要原因,但基因转换对于系统发育的影响仍尚未可知.研究不支持传统分类学上对鳞萼棘豆(O.squammulosa)与刺叶柄棘豆(O.aci ph ylla)的划分,系统发育树显示二者聚为一支,而非与传统分类学上界定的同组或同亚属植物形成一支；结合植物地理学研究结果,认为刺叶柄棘豆与鳞萼棘豆为地理替代种.推测刺叶柄棘豆可能为多系起源物种.线叶棘豆(O.fili formis)和东北棘豆(O.coerulea与真棘豆亚属物种构成姐妹群,而非单室棘豆亚属植物.研究认为在物种界定过程中,只将少数几个形态学特征作为主要分类依据欠妥.
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