期刊
PLANT SYSTEMATICS AND EVOLUTION
卷 221, 期 3-4, 页码 157-166出版社
SPRINGER-VERLAG WIEN
DOI: 10.1007/BF01089291
关键词
Calyptrotheca; Didiereaceae; Portulacaceae; chloroplast DNA; phylogeny; rpl16; systematics; trnL-trnF; trnT-trnL
A molecular phylogeny of the Didiereaceae was produced through parsimony analysis of chloroplast rpl16 intron and trnL-trnF and trnT-trnL intergenic spacer sequences of all eleven species of the Didiereaceae and several outgroup taxa from the Portulacaceae. Results indicated that: 1) the Didiereaceae were embedded within the Portulacaceae. with Calyptrotheca as the sister group of the family; 2) present generic limits were supported, 3) Alluadiopsis was the most basal lineage: 4) at least two separate episodes of polyploidization within the genus Alluaudia had occurred, and 5) unusually low amounts of variation were present in rapidly evolving noncoding plastid sequences.
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