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Titolo:
Introgressive hybridization in Rorippa (Brassicaceae): gene flow and its consequences in natural and anthropogenic habitats
Autore:
Bleeker, W; Hurka, H;
Indirizzi:
Univ Osnabruck, Dept Systemat Bot, D-49076 Osnabruck, Germany Univ Osnabruck Osnabruck Germany D-49076 Bot, D-49076 Osnabruck, Germany
Titolo Testata:
MOLECULAR ECOLOGY
fascicolo: 8, volume: 10, anno: 2001,
pagine: 2013 - 2022
SICI:
0962-1083(200108)10:8<2013:IHIR(G>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHLOROPLAST DNA; CAPSELLA BRASSICACEAE; MOLECULAR EVIDENCE; POPULATION-SIZE; EVOLUTION; ISOZYMES; SPECIATION; CARDAMINE; TOMATO;
Keywords:
chloroplast DNA; ecotypic differentiation; evolution; introgression; isozymes; man-made habitats;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Bleeker, W Univ Osnabruck, Dept Systemat Bot, Barbarastr 11, D-49076 Osnabruck, Germany Univ Osnabruck Barbarastr 11 Osnabruck Germany D-49076 Germany
Citazione:
W. Bleeker e H. Hurka, "Introgressive hybridization in Rorippa (Brassicaceae): gene flow and its consequences in natural and anthropogenic habitats", MOL ECOL, 10(8), 2001, pp. 2013-2022

Abstract

Introgressive hybridization between three Rorippa species (R. amphibia, R.palustris and R. sylvestris) in northern Germany has been studied using isozymes and noncoding chloroplast DNA (trnL/F spacer). Our results provide substantial evidence for different patterns of gene flow in natural and in anthropogenic environments. Hybridization and bi-directional introgression (chloroplast DNA and allozymes) between R. amphibia and R. sylvestris were detected at the river Elbe, which is one of the last rivers in Central Europe showing a natural dynamic of erosion and sedimentation. The natural dynamic of the Elbe leads to periodic habitat disturbance and the temporal breakdown of ecological isolation barriers between R. amphibia and R, sylvestris. However, the high dynamic does not provide the opportunity for persistence of the morphologically intermediate hybrid R. x anceps (R. amphibia x R. sylvestris). We did not find hybrid zones between R. amphibia and R. sylvestris in the more anthropogenic landscape of northwest Germany. However, contact zones between R. amphibia and R. palustris were detected in drainage ditches in northwest Germany. We found substantial evidence for unidirectional introgression. of R. palustris markers (chloroplast DNA and allozymes) into R. amphibia in the man-made habitats. The R. amphibia introgressants inthe drainage ditches often showed strongly serrate upper cauline leaves instead of the entire upper cauline leaves typical for R. amphibia. We argue that landscape melioration in northwest Germany, particularly the creation of drainage ditches, favoured both hybrid-zone formation and ecotypic differentiation within R. amphibia.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/04/20 alle ore 23:38:14