Revisão taxonômica de Acianthera sect. Pleurobotryae (Orchidaceae, Pleurothallidinae)

Rodrigues, Vinícius Trettel; Smidt, Eric de Camargo; Barros, Fábio de

doi:10.1590/2236-8906-60/2015

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…The leaves in Acianthera section Pleurobotryae are cylindrical or laterally compressed [ 14 ] and round or elliptical in cross-section. The presence of round leaves in A .…”

Section: Discussionmentioning

confidence: 99%

“…Since the species of A . section Pleurobotryae are epiphytic and occur in the Atlantic Forest [ 14 ], where the capture of sunlight can be difficult, the change from cylindrical to laterally compressed shape could be an adaptation for an increased area of exposure of the leaf, thus improving the efficiency of capture of sunlight [ 61 , 62 ].…”

Section: Discussionmentioning

confidence: 99%

“…V.T. Rodrigues & F. Barros [ 14 ]. Recent phylogenetic analyses, based on nuclear ITS and chloroplast matK sequences, recovered A .…”

Section: Introductionmentioning

confidence: 99%

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Evolution of anatomical characters in Acianthera section Pleurobotryae (Orchidaceae: Pleurothallidinae)

2019

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Acianthera section Pleurobotryae is one of ten sections of the genus Acianthera and include four species endemic to the Atlantic Forest. The objective of this study was to describe comparatively the anatomy of vegetative organs and floral micromorphology of all species of Acianthera section Pleurobotryae in order to identify diagnostic characters between them and synapomorphies for the section in relation of other sections of the genus. We analyzed roots, ramicauls, leaves and flowers of 15 species, covering eight of the nine sections of Acianthera, using light microscopy and scanning electron microscopy. Acianthera section Pleurobotryae is a monophyletic group and the cladistic analyses of anatomical and flower micromorphology data, combined with molecular data, support internal relationship hypotheses among the representatives of this section. The synapomorphies identified for A. sect. Pleurobotryae are based on leaf anatomy: unifacial leaves, round or elliptical in cross-section, round leaves with vascular bundles organized in concentric circles, and mesophyll with 28 to 30 cell layers. Within the section, the clade (A. crepiniana + A. mantiquyrana) presented more differences in vegetative organ morphology and higher support values in combined analyses when compared to the second clade, (A. atropurpurea + A. hatschbachii). For each of these clades an exclusive set of homoplasies of vegetative and floral organs were also identified. The results support the argument that vegetative organs are more evolutionarily stable in comparison to reproductive organs and thus helpful for inference of internal phylogenetic relationships in Acianthera, while flowers are highly variable, perhaps due to the diversity of pollinator attraction mechanisms. The analyses indicate that the elliptical leaves observed in A. crepiniana have originated from round leaves observed in the other species of this section, suggesting an adaptation to increase the area of exposure of the leaf and better the efficiency of capture of sunlight in shaded environments such as the Atlantic Forest. The presence of papillose regions in both vegetative and floral organs indicated that micromorphological characters are also useful for the delimitation of species and sections within the genus.

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“…The leaves in Acianthera section Pleurobotryae are cylindrical or laterally compressed [ 14 ] and round or elliptical in cross-section. The presence of round leaves in A .…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Evolution of anatomical characters in Acianthera section Pleurobotryae (Orchidaceae: Pleurothallidinae)

2019

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Phylogeny of Acianthera sect. Pleurobotryae (Orchidaceae: Pleurothallidinae), an endemic group of the Atlantic Forest

et al. 2017

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Among the members of subtribe Pleurothallidinae, Acianthera is one of the largest genera in Brazil with ca. 107 endemic species. A recent study of Acianthera, including a phylogeny based on nrITS and a systematic revision, proposed dividing the genus into nine sections. In this revision, the genus Pleurobotryum was reduced to Acianthera sect. Pleurobotryae. However, the true position of this section and its circumscription are debatable because the authors included only one species of the genus and did not include the type species (Pleurobotryum atropurpureum Barb. Rodr.) in the analysis. The objective of this work was to study the monophyly of the section and phylogenetic relationships among the species of A. sect. Pleurobotryae. The study included all of the species in this group and used the nuclear marker ITS (ITS1, 5.8S gene and ITS2) and an initial portion of the plastid marker matK for individual and combined maximum parsimony, Bayesian and maximum likelihood analyses. The results show that A. sect. Pleurobotryae is monophyletic with high bootstrap, decay index, and posterior probability support. Within the group, the results suggest, with moderate to strong support, the recognition of two sister clades: [(Acianthera hatschbachii (Schltr.) Chiron & van den Berg, Acianthera atropurpurea (Barb. Rodr.) Chiron & van den Berg), (Acianthera mantiquyrana (Barb. Rodr.) V. T. Rodrigues & F. Barros, Acianthera crepiniana (Cogn.) Chiron & van den Berg)]. The lack of resolution using only nrITS, the strong phylogenetic signal from the matK, and the combined analyses suggest that more studies are needed to verify the phylogenetic position and circumscription of some of the other sections in the genus. In addition, it is important that type species and morphological characters are incorporated into the definitions of the clades.

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Within the roots of Pleurothallidinae (Orchidaceae): An evolutionary analysis

Rodrigues

Oliveira

Kedrovski

et al. 2021

Flora

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Revisão taxonômica de Acianthera sect. Pleurobotryae (Orchidaceae, Pleurothallidinae)

Cited by 4 publications

References 5 publications

Evolution of anatomical characters in Acianthera section Pleurobotryae (Orchidaceae: Pleurothallidinae)

Evolution of anatomical characters in Acianthera section Pleurobotryae (Orchidaceae: Pleurothallidinae)

Phylogeny of Acianthera sect. Pleurobotryae (Orchidaceae: Pleurothallidinae), an endemic group of the Atlantic Forest

Within the roots of Pleurothallidinae (Orchidaceae): An evolutionary analysis

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