Morphological and genomic characterization of Rhynchospora tenuis complex (Cyperaceae) and its taxonomic implications

Rodriguésia

Modesto Luceño¹  Vanessa Silva Michelan²  Rogério Fernandes de Souza²  André Luís Laforga Vanzela²  Carlos Roberto Maximiano da Silva²  Rafael Trevisan³ 

[1] Universidad Pablo de Olavide;Universidade Estadual de Londrina;Universidade Federal de Santa Catarina;

关键词: cytotaxonomy;    dysploidy;    ISSR;    holocentric chromosomes;    Poales;   

DOI  :  10.1590/S2175-78602012000400003

来源: DOAJ

【 摘 要 】

Species of Rhynchospora sect. Tenues are morphologically very similar. Rhynchospora tenuis complex is the most problematic species complex in this group and it concentrates entities of difficult delimitation, as is the case of R. tenuis, R. tenuis subsp. austro-brasiliensis and R. enmanuelis. Samples of these three taxonomic entities, besides R. junciformis and R. breviuscula (Dichromena), were analyzed in a comparative way using morphologic, cytogenetic and molecular tools. Despite of high morphological similarity between these taxa, R. tenuis was separated from R. tenuis subsp. austro-brasiliensis and R. enmanuelis according to chromosome numbers (2n = 4 and 2n = 18) and ISSR markers. The combined analysis of shape and size of achenes and stylopodium, number of spikelets, cytogenetic features and molecular markers suggest a clear proximity among Rhynchospora junciformis, R. tenuis subsp. austro-brasiliensis and R. enmanuelis, in relation to R. tenuis. These data indicate the need for a new taxonomic review of R. sect. Tenues, mainly to solve the status and nomenclatural situation of R. tenuis subsp. austro-brasiliensis and R. enmanuelis.

【 授权许可】

Unknown