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Phylogenetic relationships in the order Cucurbitales and a new classification of the gourd family (Cucurbitaceae)

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Abstract:

We analysed phylogenetic relationships in the order Cucurbitales using 14 DNA regions from the three plant genomes: the mitochondrial nad1 b/c intron and matR gene, the nuclear ribosomal 18S, ITS1-5.8S-ITS2, and 28S genes, and the plastid rbcL, matK, ndhF, atpB, trnL, trnL-trnF, rpl20-rps12, trnS-trnG and trnH-psbA genes, spacers, and introns. The dataset includes 664 ingroup species, representating all but two genera and over 25% of the ca. 2600 species in the order. Maximum likelihood analyses yielded mostly congruent topologies for the datasets from the three genomes. Relationships among the eight families of Cucurbitales were: (Apodanthaceae, Anisophylleaceae, (Cucurbitaceae, ((Coriariaceae, Corynocarpaceae), (Tetramelaceae, (Datiscaceae, Begoniaceae))))). Based on these molecular data and morphological data from the literature, we recircumscribe tribes and genera within Cucurbitaceae and present a more natural classification for this family. Our new system comprises 95 genera in 15 tribes, five of them new: Actinostemmateae, Indofevilleeae, Thladiantheae, Momordiceae, and Siraitieae. Formal naming requires 44 new combinations and two new names in Cucurbitaceae.

Keywords: CUCURBITOIDEAE; FEVILLEOIDEAE; NOMENCLATURE; NUCLEAR RIBOSOMAL ITS; SYSTEMATICS; TRIBAL CLASSIFICATION

Document Type: Research Article

Affiliations: 1: Harvard University, Department of Organismic and Evolutionary Biology, 22 Divinity Avenue, Cambridge, Massachusetts 02138, U.S.A.;, Email: hschaef@fas.harvard.edu 2: University of Munich (LMU), Systematic Botany and Mycology, Menzinger Str. 67, 80638 Munich, Germany

Publication date: February 1, 2011

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