Incongruent plastid and nuclear DNA phylogenies reveal ancient intergeneric hybridization in Pilosella hawkweeds (Hieracium, Cichorieae, Asteraceae)

被引:190
作者
Fehrer, Judith [1 ]
Gemeinholzer, Birgit
Chrtek, Jindrich, Jr.
Braeutigam, Siegfried
机构
[1] Acad Sci Czech Republ, Inst Bot, CS-25243 Pruhonice, Czech Republic
[2] Inst Plant Genet & Crop Plant Res, D-06466 Gatersleben, Germany
[3] Staatliches Museum Naturkunde, D-02806 Gorlitz, Germany
关键词
Andryala; apomixis; Asteraceae; chloroplast capture; Hieracium; incongruence; intergeneric hybridization; internal transcribed spacer; matK; molecular evolution; molecular phylogeny; Pilosella; polyploidy; speciation; trnT-trnL;
D O I
10.1016/j.ympev.2006.07.004
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Phylogenetic relationships for Hieracium subgen. Pilosella were inferred from chloroplast (trnT-trnL, matK) and nuclear (ITS) sequence data. Chloroplast markers revealed the existence of two divergent haplotype groups within the subgenus that did not correspond to presumed relationships. Furthermore, chloroplast haplotypes of the genera Hispidella and Andryala nested each within one of these groups. In contrast, ITS data were generally in accord with morphology and other evidence and were therefore assumed to reflect the true phylogeny. They revealed a sister relationship between Pilosella and Hispidella and a joint clade of Hieracium subgenera Hieracium and Chionoracium (Stenotheca) while genus Andryala represented a third major lineage of the final ingroup cluster. Detailed analysis of trnT-trnL character state evolution along the ITS tree suggested two intergeneric hybridization events between ancestral lineages that resulted in cytoplasmic transfer (from Hieracium/Chionoracium to Pilosella, and from the introgressed Pilosella lineage to Andryala). These chloroplast capture events, the first of which involved a now extinct haplotype, are the most likely explanation for the observed incongruencies between plastid and nuclear DNA markers. (c) 2006 Elsevier Inc. All rights reserved.
引用
收藏
页码:347 / 361
页数:15
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