Molecular phylogeny of Salix L. (Salicaceae) inferred from three chloroplast datasets and its systematic implications

Authors: Chen, Jia-Hui; Sun, Hang; Wen, Jun; Yang, Yong-Ping

Source: Taxon, Volume 59, Number 1, February 2010 , pp. 29-37(9)

Publisher: International Association for Plant Taxonomy

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Abstract:

Salix is a taxonomically difficult genus and its generic limits and infrageneric division are still highly controversial. We employed sequences of the chloroplast rbcL gene, trnD-T spacer and atpB-rbcL spacer for phylogenetic analyses of Salix. The results strongly support that Salix, Toisusu and Chosenia form a monophyletic group, confirming the merge of Toisusu and Chosenia with Salix. Within Salix s.l., two major clades are recognizable; one contains species of subgenus Salix (excluding sections Triandrae and Urbanianae), with the New World and the Old World species forming strongly supported clades, respectively; and the other includes sections Triandrae, Urbanianae, Chosenia and all species of subgenera Chamaetia and Vetrix, with the latter two subgenera forming a robustly supported subclade but with low resolution. A new infrageneric classification of Salix is herein proposed. The previously recognized subgenus Salix is split into three subgenera: Salix, Chosenia and Triandrae, and subgenera Chamaetia and Vetrix are combined as subgenus Vetrix.

Keywords: ATPB-RBCL; CHLOROPLAST MARKERS; MOLECULAR PHYLOGENY; RBCL; SALICACEAE; SALIX; SYSTEMATICS; TRND-T

Document Type: Research Article

Affiliations: Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650204, P.R. China

Publication date: February 1, 2010

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