Molecular phylogeny of the Monotropoideae (Ericaceae) with a note on the placement of the Pyroloideae

Autor: Ken Cullings
Rok vydání: 1994
Předmět:
Zdroj: Journal of Evolutionary Biology. 7:501-516
ISSN: 1420-9101
1010-061X
Popis: Mycotrophism occurs in two ericaceous subfamilies, the Monotropoideae and the Pyroloideae. However, three aspects of the evolution of these subfamilies remain equivocal; 1) morphological, biochemical, and molecular analyses have failed to establish that the Monotropoideae is monophylectic; 2) the relationships among members of the Monotropoideae remain unresolved; 3) it is unclear whether the Pyroloideae should be included as a subfamily within the Ericaceae or treated as a separate family. To address these topics a phylogeny was constructed using a portion of the 28s ribosomal RNA gene from 22 members of the Ericaceae. Results indicate that the present Monotropoideae is polyphyletic; one species, Monotropsis ordata, is more closely related to members of the Vaccinioideae than to the rest of the Monotropoideae. This arrangement is supported by consideration of mycorrhizal type, consequently multiple origins of mycotrophic parasitism must be assumed. The relationships depicted within the Monotropoideae are nearly congruent with those depicted in Copeland’s (1941) phylogeny, and morphological or biochemical characters are identified which support the relationships depicted by the molecular tree which do not agree with the morphological tree. In addition, the data indicate, although not strongly, that the Pyroloideae should be included within the Ericaceae.
Databáze: OpenAIRE
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