Does higher ploidy level increase the risk of invasion?A case study with two geo-cytotypes of Solidago gigantea Aiton(Asteraceae)  

作　　者：David U.Nagy Szilvia Stranczinger Aliz Godi Anett Weisz Christoph Rosche Jan Suda Mark Mariano Robert W.Pal 

机构地区：[1]Department of Ecology,Institute of Biology,Faculty of Sciences,University of Pécs,H-7624 Pécs,Ifjúság u.6,Hungary [2]Department of Botany,Institute of Biology,Faculty of Sciences,University of Pécs,H-7624 Pécs,Ifjúság u.6,Hungary [3]Working Group:Plant Ecology,Institute of Biology/Geobotany and Botanical Garden,Martin Luther University Halle-Wittenberg,Am Kirchtor 1,D-06108 Halle,Germany [4]Department of Botany,Faculty of Science,Charles University in Prague,Benátská2,CZ-12801 Prague,Czech Republic and Institute of Botany,The Czech Academy of Sciences,Zámek 1,CZ-25243 Pruhonice,Czech Republic [5]Department of Biological Sciences,Montana Tech,Montana Tech of the University of Montana,1300 W Park StMT 59701 Butte,USA

出　　处：《Journal of Plant Ecology》2018年第2期317-327,共11页植物生态学报（英文版）

摘　　要：Aims Understanding the role of genetics in biological invasions has become an important aspect for modern plant ecology.Many studies suggest that increased ploidy level benefits the success of an invasive species,but the basis for this phenomenon is not fully understood.in its native,North American range,Solidago gigantea has three geo-cytotypes comprising di-,tetra-and hexa-ploid populations,while in Europe,where it is highly invasive,S.gigantea stands are composed primarily of tetraploid individu-als.Our study investigates whether North American hexaploids can induce a greater risk of invasion,due to their higher perfor-mance in a non-native range,as compared to the existing tetra-ploids of that range.Methods We performed greenhouse and common garden experiments along with microsatellite analyses to test whether differences in chromo-some number and origin of the species mean superior fitness in the introduced range.Important Findings Genetic diversity was significantly higher in the native hexaploid popula-tions(A_(R)=6.04;H_(e)=0.7794),rather than the non-native tetraploid pop-ulations(A_(R)=4.83;H_(e)=0.6869).Furthermore,differentiation between geo-cytotypes was moderate(ρST=0.1838),which was also confirmed by their clear segregation in principal component analysis and structure analyses,proving their different genetic structure.in contrast to genetic diversity,the non-native tetraploid geo-cytotype performed better in the common garden experiment,implying that higher genetic diversity does not always mean better success.Our results suggest that native hexa-ploids do not present a greater risk,as assessed by their performance in the introduced range,when compared to the non-native tetraploids,as was suggested by previous studies.Nevertheless,their introduction is still undesirable due to their different genetic structure,which,through hybridization,could give a new drive to the invasion of S.gigantea.

关 键 词：EICA plant invasion MICROSATELLITE ECOTYPE POLYPLOIDY 

分 类 号：R73[医药卫生—肿瘤]