期刊
PLANT SYSTEMATICS AND EVOLUTION
卷 288, 期 3-4, 页码 227-243出版社
SPRINGER WIEN
DOI: 10.1007/s00606-010-0327-9
关键词
Paspalum; Polyploidy; cpDNA; Phylogeny; Paniceae
资金
- CONICET, Argentina [PIP 6568]
- University of Buenos Aires, Argentina [UBACyT JG21, G806]
- Conselho Nacional de Desen-volvimento Cientifico e Tecnologico (CNPq), Brazil
With about 350 species, Paspalum is one of the richest genera within the Poaceae. Its species inhabit ecologically diverse areas along the Americas and they are largely responsible for the biodiversity of grassland ecosystems in South America. Despite its size and relevance, no phylogeny of the genus as a whole is currently available and infrageneric relationships remain uncertain. Many Paspalum species consist of sexual-diploid and apomictic-polyploid cytotypes, and several have arisen through hybridization. In this paper we explore the phylogenetic structure of Paspalum using sequence data of four non-coding cpDNA fragments from a wide array of species which were combined with morphological data for a subset of diploid taxa. Our results confirmed the general monophyly of Paspalum if P. inaequivalve is excluded and the small genus Thrasyopsis is included. Only one of the four currently recognized subgenera was monophyletic but nested within the remainder of the genus. Some informal morphological groups were found to be polyphyletic. The placement of known allopolyploid groups is generally congruent with previously stated hypotheses although some species with shared genomic formulae formed paraphyletic arrangements. Other species formed a basal grade including mostly umbrophilous or hygrophilous species. It is hypothesized that the genus may have diversified as a consequence of the expansion of C4 grass-dominated grasslands in South America.
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