基于叶绿体trnL-F序列以及matK序列探讨虎杖属与西伯利亚蓼的系统学位置

Systematic position of Reynoutria and Polygonum sibiricum inferred from sequences of chloroplast trnL-F and matK

以蓼科Polygonaceae酸模亚科Rumicoideae酸模族Rumiceae大黄属RheumL.作外类群,对蓼亚科Polygonideae蓼族Polygoneae 4属19种1变种的trnL-F序列以及16种1变种的matK序列进行了测定(部分序列取自GenBank)和聚类分析,探讨了虎杖属Reynoutria Houtt.和西伯利亚蓼Polygonum sibiricum Laxm.的系统学位置,结果表明:(1)虎杖属在两个严格一致树中都聚到了何首乌属Fallopia Adans.的内部,trnL-F序列的支持率为99%,matK序列的支持率为100%,说明虎杖属应归入何首乌属中,所以虎杖属的R.japonica Houtt.与R.sachalinense(F.Schmidt ex Maxim.)Nakai应分别命名为Fallopia japonica(Houtt.)RonseDecraene和F.sachalinense(F.Schmidt ex Maxim.)Ronse Decraene;(2)两个严格一致树都表明,西伯利亚蓼远离蓼属Polygonum L.,聚到了何首乌属的附近,两个序列支持率都为99%,应将该种从蓼属中移出来,提升为属级,即西伯利亚蓼属Knorringia Tzvel.,西伯利亚蓼应命名为Knorringia sibirica(Laxm.) Tzvel.。另外,本文对何首乌属与西伯利亚蓼属作了界定。

The sequences of chloroplast trnL-F （including 19 species and 1 varieties） and matK （including 16 species and 1 varieties） regions of 4 genera from Polygonaceae were compared and analyzed to examine the systematic position of Reynoutria Houtt. and Polygonum sibiricum Laxm. The genus Rheum L. from subfamily Rumicoideae was designated as the outgroup. From the two strict consensus trees it was inferred that： （1） the genus Reynoutria was a member of the genus Fallopia with high bootstrap support; （2） Polygonum sibiricum Laxm. was separated from Polygonum and adjacent to genus Fallopia, so this species should be raised to the genus rank and can be called Knorringia sibirica （Laxm.） Tzvel. Moreover, the boundary of the two genera was defined in this article.