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Generic level phylogeny of Thalictroideae (Ranunculaceae) — implications for the taxonomic status of Paropyrum and petal evolution
Author(s) -
Wang Wei,
Chen Zhi-Duan
Publication year - 2007
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.2307/25065863
Subject(s) - petal , biology , polyphyly , sister group , monophyly , botany , evolutionary biology , clade , phylogenetics , zoology , genetics , gene
The subfamily Thalictroideae, which is clearly defined by its chromosome characters, contains nine or ten genera. Here we use sequences of chloroplast rbcL and matK genes as well as non‐coding trnL‐F and nuclear ITS regions to reconstruct the generic level phylogeny of this subfamily. Our data recognize three major groups within Thalictroideae: (1) Thalictrum, Leptopyrum, Paropyrum , and Paraquilegia ; (2) Urophysa, Semiaquilegia , and Aquilegia ; and (3) Dichocarpum, Enemion , and Isopyrum. Isopyrum anemonoides , the sole species of Paropyrum , and Paraquilegia form a clade sister to Leptopyrum ; together they make up the first group. Isopyrum manshuricum and I. thalictroides form another clade within the third group. Isopyrum anemonoides is sister to the monophyletic Paraquilegia . Our data suggest that Isopyrum is polyphyletic and support the segregate genus Paropyrum . Reconstruction of petal evolution suggests a secondary loss of petals in Enemion and Thalictrum , in contrast with the view that apetalous taxa are the most primitive. Petals with longer stalks in Dichocarpum are shown to be derivative, refuting the viewpoint that this type is a primitive condition. The flat petals in Paraquilegia may be derived from the tubular‐type petals in Paropyrum and Leptopyrum , and spurred petals are thought to have originated from a single ancestor.