Phylogenetic analysis of the Malvadendrina clade (Malvaceae s.l.) based on plastid DNA sequences

Phylogenetic relationships within Malvaceae s.l., a clade that includes the traditional families Bombacaceae, Malvaceae s.str., Sterculiaceae, and Tiliaceae, have become greatly clarified thanks to recent molecular systematic research. In this paper, we use DNA sequences of four plastid regions ( at...

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Veröffentlicht in:Organisms diversity & evolution 2005-06, Vol.5 (2), p.109-123
Hauptverfasser: Nyffeler, Reto, Bayer, Clemens, Alverson, William S., Yen, Alan, Whitlock, Barbara A., Chase, Mark W., Baum, David A.
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container_end_page 123
container_issue 2
container_start_page 109
container_title Organisms diversity & evolution
container_volume 5
creator Nyffeler, Reto
Bayer, Clemens
Alverson, William S.
Yen, Alan
Whitlock, Barbara A.
Chase, Mark W.
Baum, David A.
description Phylogenetic relationships within Malvaceae s.l., a clade that includes the traditional families Bombacaceae, Malvaceae s.str., Sterculiaceae, and Tiliaceae, have become greatly clarified thanks to recent molecular systematic research. In this paper, we use DNA sequences of four plastid regions ( atpB, matK, ndhF, and rbcL) to study relationships within Malvadendrina, one of the two major clades of Malvaceae s.l. The four data sets were generally in agreement, but five terminal taxa manifested highly unexpected affinities in the rbcL partition, and the non-coding sequences of the trnK intron were found to provide limited phylogenetic information for resolving relationships at the base of Malvadendrina. The remaining data strongly support the existence of six major clades within Malvadendrina: Brownlowioideae, Dombeyoideae, Helicteroideae, Malvatheca (comprising Bombacoideae and Malvoideae), Sterculioideae, and Tilioideae. These data also resolve the placement of two problematic taxa: Nesogordonia (in Dombeyoideae) and Mortoniodendron (in Tilioideae). The relationships among the six clades are not definitively resolved, but the best-supported topology has Dombeyoideae as sister to the remainder of Malvadendrina (posterior probability PP = 80 % ) and Sterculioideae as sister to Malvatheca ( PP = 86 % ). This early branching position of Dombeyoideae is supported by similarities in floral characters between members of that clade and outgroup taxa in Byttnerioideae. Similarly, the sister-group relationship of Sterculioideae and Malvatheca receives support from androecial characteristics, like subsessile or sessile anthers and an absence of staminodes, shared by these two clades.
doi_str_mv 10.1016/j.ode.2004.08.001
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subjects Bombacaceae
Character evolution
Malvaceae
Malvadendrina
Molecular systematics
Sterculiaceae
Tiliaceae
title Phylogenetic analysis of the Malvadendrina clade (Malvaceae s.l.) based on plastid DNA sequences
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