Genetic and morphological variation in the Bulbophyllum exaltatum (Orchidaceae) complex occurring in the Brazilian “campos rupestres”: implications for taxonomy and biogeography

Ribeiro, Patrícia Luz; Borba, Eduardo Leite; Smidt, Eric de Camargo; Lambert, Sabrina Mota; Schnadelbach, Alessandra Selbach; Berg, Cássio van den

doi:10.1007/s00606-007-0603-5

Cited by 37 publications

(11 citation statements)

References 40 publications

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“…In these same environments and in similar environments, this biosystematics approach, using molecular markers, morphometry and other sources of information, has aided the understanding of the processes involved in the formation of complexes of species and hybrid zones in several plant groups (e.g. Borba et al ., , ; Lambert, Borba & Machado, ; Lambert et al ., ; Ribeiro et al ., ; Conceição et al., , ; Barbosa et al ., ). Besides allowing a clearer taxonomic delimitation of the species involved, this approach can also help prevent the proliferation of a myriad of names, especially false hybrids (e.g.…”

Section: Discussionmentioning

confidence: 97%

When hybrids are not hybrids: a case study of a putative hybrid zone betweenCattleya coccineaandC. brevipedunculata(Orchidaceae)

et al. 2016

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Cattleya coccinea and C. brevipedunculata (Orchidaceae) are closely related species distinguished primarily by geographical distribution, vegetative morphology and flowering period. Both species inhabit high‐elevation regions in south‐eastern Brazil, but are traditionally associated with different habitats, located in cloudy forests and campos rupestres (rocky fields), respectively. We used morphometrics and genetic variation of microsatellite markers to test the occurrence of a hybrid zone between these species located in Parque Estadual do Ibitipoca (PEI), Brazil. Morphological data reveal a continuum of variation between the putative taxa, influenced mainly by characters of leaf, pseudobulb and peduncle. However, genetic data do not support the occurrence of hybridization and introgression in PEI, showing that it is a pure population of C. brevipedunculata. Differences in vegetative characters among individuals from cloudy forests and campos rupestres suggest that morphological variation may be related to phenotypic plasticity in response to environmental light fluctuations, an unknown situation for this species. These results highlight the inconsistency of morphology for the identification of hybrids and the role of vegetative characters as a possible complicating factor for the taxonomy of these species, as they are subject to environmental influence.

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Section: Discussionmentioning

confidence: 97%

When hybrids are not hybrids: a case study of a putative hybrid zone betweenCattleya coccineaandC. brevipedunculata(Orchidaceae)

et al. 2016

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“…This section shows great problems in specific delineation because of its highly variable morphology, and this has resulted in the naming of many geographically restricted ‘species’ (Smidt et al ., ), especially in the B. exaltatum species complex (Ribeiro et al ., ), with its broad distribution in the highland areas of South America and the presence of natural hybrids (Borba & Semir, ; Mancinelli & Smidt, ).…”

Section: Introductionmentioning

confidence: 99%

What do floral anatomy and micromorphology tell us about NeotropicalBulbophyllumsectionDidactyle(Orchidaceae: Bulbophyllinae)?

et al. 2014

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Bulbophyllum section Didactyle comprises seven species, but distinction between these is often problematic. These species are pollinated by milichiid flies and air currents move the hinged labellum and press the pollinator against the gynostemium. The labellum structure is considered to be homogeneous and conservative for the genus. Therefore, the floral anatomy and micromorphology of B. section Didactyle were studied in order to identify characters useful for distinguishing the species. All species have sunken glandular trichomes on the abaxial surface of the sepals (possible osmophores) and a trilobed labellum, clothed with trichomes, with a secretory cavity in the callus that is bound by scale-like papillae. Of the c. 100 characters assessed, 25 varied between species, and each pair of species differed by at least four character states, mainly occurring on the labellum. The data presented allow for a distinction to be made between species and corroborates their grouping in B. section Didactyle, as proposed previously. The presence of osmophores and a nectary on the labellum is confirmed, although their structure is more diverse than anticipated. Moreover, structural differences between B. weddellii and the core of the section might be the result of the odour-mediated attraction of pollinators rather than flower morphology and thus phylogeny.

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“…Most of the species in these formations are distributed in disjunct populations because of the natural discontinuity of the rock outcrops, especially the rupicolous species. This distribution is believed to be one of the principal factors acting in the differentiation of the populations and the elevated levels of endemism seen in campos rupestres sites (Giulietti and Pirani, 1988; Borba et al, 2001; Jesus et al, 2001, 2009; Franceschinelli et al, 2006; Rapini et al, 2008; Ribeiro et al, 2008; Lousada et al, 2011). Due to the effects of spatial subdivision on patterns of gene flow and genetic variability, the campos rupestres may be compared to ocean islands, as well as the rock inselbergs that occur in tropical forests.…”

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confidence: 99%

Geographical genetic structuring and phenotypic variation in the Vellozia hirsuta (Velloziaceae) ochlospecies complex

Barbosa

Fiorini

Silva-Pereira

et al. 2012

American J of Botany

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It is recommended that Vellozia hirsuta be considered a single enormously variable species. The patterns of variation within V. hirsuta probably are related to climatic changes that occurred during the Pleistocene Epoch in tropical Brazil when reductions in forest cover favored the expansion of V. hirsuta populations into extensive lowland areas. The expansion of forest cover at the end of the glaciations would have again restricted the occurrence of campos rupestres vegetation to high elevations, which constitute the current centers of diversity of this species.

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Genetic and morphological variation in the Bulbophyllum exaltatum (Orchidaceae) complex occurring in the Brazilian “campos rupestres”: implications for taxonomy and biogeography

Cited by 37 publications

References 40 publications

When hybrids are not hybrids: a case study of a putative hybrid zone betweenCattleya coccineaandC. brevipedunculata(Orchidaceae)

When hybrids are not hybrids: a case study of a putative hybrid zone betweenCattleya coccineaandC. brevipedunculata(Orchidaceae)

What do floral anatomy and micromorphology tell us about NeotropicalBulbophyllumsectionDidactyle(Orchidaceae: Bulbophyllinae)?

Geographical genetic structuring and phenotypic variation in the Vellozia hirsuta (Velloziaceae) ochlospecies complex

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