Filogenia molecular e anatomia da subtribo Cereinae (Cactoideae, Cactaceae)
In the light of a recent phylogenetic review, Cereinae was proposed as one of the three subtribes of tribe Cereeae s.l., which includes most of South American columnar cacti lineages in Cactoideae. Current Cereinae comprises species in 14 genera with a remarkable occurrence in eastern Brazil, mai...
Na minha lista:
| Autor principal: | |
|---|---|
| Outros Autores: | |
| Formato: | doctoralThesis |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
|
| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/31557 |
| Tags: |
Adicionar Tag
Sem tags, seja o primeiro a adicionar uma tag!
|
| Resumo: | In the light of a recent phylogenetic review, Cereinae was proposed as one of the three
subtribes of tribe Cereeae s.l., which includes most of South American columnar cacti lineages
in Cactoideae. Current Cereinae comprises species in 14 genera with a remarkable occurrence
in eastern Brazil, mainly in dry forest formations such as Caatinga. Nevertheless, the
circumscription of the group is still quite controversial, generic delimitations are problematic,
and the knowledge of the anatomy of species is incipient. The aims of this study were to test
the monophyletism of Cereinae based on multigenic data and in a broad sampling, evaluate
the subtribe systematics, in particular the generic circumscriptions, and survey potential
diagnostic and phylogenetic anatomical traits of the dermal system and part of the fundamental
system of representatives of 11 genera of the subtribe. The results point to a monophyletic
Cereinae with high support in Bayesian, maximum parsimony, and maximum likelihood
analyses based in combined matrices, and expand the knowledge of generic relationships
within the subtribe. Regarding the morphological and the ancestral state reconstruction
analyses results, some skin features are phylogenetic informative for some groups within the
subtribe, such as the markedly plicate cell outline shared by all Melocactus species, the
abundant prismatic crystals in the epidermal cells shared by all species of Arrojadoa and
Stephanocereus, the presence of druses with the rounded-oval-shape outline in the spongy
parenchyma shared by all species of Cereus and Cipocereus, and the combination of druses
with the rounded-oval-shape outline and in concretions in the spongy parenchyma shared by
Cereus species. These groups emerge as clades strongly supported by Bayesian analyses in
our phylogeny, demonstrating the relevance of anatomical characters for taxonomy. Our
results showed novelties both in the anatomy of the species and in the phylogeny of Cereinae
as a base of future investigations in a systematic framework also serving to support the study
of the evolutionary history and patterns of South American dry forests and the associated biota
as a whole. |
|---|