Velloziaceae do Parque Estadual de Ibitipoca, Minas Gerais, Brasil

Montserrat, Laura; Mello‐Silva, Renato de

doi:10.11606/issn.2316-9052.v31i2p131-139

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…Our preliminary observations show that secretions are produced throughout flower and fruit development. Such secretory structures have been described as capitate glandular trichomes (Sazima 1978;Sajo et al 2010), and most recently as glandular emergences (Montserrat and Mello-Silva 2013). The taxonomic value of these glands has been highlighted by Mello-Silva (1995).…”

Section: Introductionmentioning

confidence: 99%

Oil-resin glands in Velloziaceae flowers: structure, ontogenesis and secretion

et al. 2016

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Many Velloziaceae flowers present conspicuous glands, whose taxonomic value has already been highlighted. However, until now, their micromorphology, anatomy and ultrastructure have not been investigated, nor have the natures and possible functions of their exudates. Our aim was to investigate distribution, ontogenesis, structure, and secretion mechanisms of glands of Barbacenia flava and Vellozia intermedia and to discuss their possible ecological functions. Samples were prepared according to standard methods for investigations of plant anatomy, scanning electron microscopy, and transmission electron microscopy. Histochemical tests were performed, and focal field observations were made in the study site. The capitate stalked glands on the pedicel, tepals and hypanthium are covered by a sticky secretion that is released in the gland head through the outer periclinal cell walls and cuticle. Secretions are produced in the epidermal and subepidermal cells that contain structural components typical of mixed, mainly lipophilic secretions. Bacteria were found inside the oil-resin gland cells of both species. The Meliponina bees Trigona spinipes and Tetragonisca angustula were observed collecting resin from both species, but were not involved in pollination. Our observations clearly indicate that flower glands of B. flava and V. intermedia are oil-resin secreting and remain active in secretion from very young buds, through to immature fruit. New, smaller glands replace senescent glands by divisions near the base of the original stalk cells. Oil-resin glands have a number of different, but important functions, including the interaction with Meliponina bees, protection against water loss and high temperatures by ultraviolet screening, and anti-desiccant properties.

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Section: Introductionmentioning

confidence: 99%

Oil-resin glands in Velloziaceae flowers: structure, ontogenesis and secretion

et al. 2016

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Zoomingin on quartzitic outcrops: micro-habitat influences on flora and vegetation

Badia¹,

Messias²,

Echternacht³

2021

Rodriguésia

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Rock outcrop vegetation is recognized worldwide by its singular and biodiverse flora. Campo Rupestre forms hyperdiverse mosaics in rocky environments across a wide latitudinal and altitudinal gradient, with high species turnover at macro- and micro-scales. The surrounding biomes, climate, and geological formations are the main drivers of species turnover on a macro-scale while micro-habitat seems to be the main one determining the peculiarities of the Campo Rupestre on a micro-scale. In a quartzitic Campo Rupestre area we evaluate how the outcrop micro-habitats influence floristic composition and functional traits. The study area is located in the municipality of Ouro Preto, Minas Gerais state, southeastern Brazil. Two main outcrop habitats were considered: top surfaces, with bare rock, shallow depressions and ephemeral ponds; and lateral surfaces, with clefts and crevices. We recorded the vascular species, their respective life-forms (according to Raunkiaer’s system) as well as their coverage in 18 plots. We identified 71 species in 31 families. The floristic spectra and species composition were similar between top and lateral surfaces. There was no significant difference among the vegetational spectra. However, hemicryptophytes were slightly dominant on top, while on the sides chamaephytes were the dominant life-form. Understanding plant adaptations to these environments provides insights into the mechanisms underlying geomorphological heterogeneity in plant communities.

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Flora do Parque Estadual do Ibitipoca, Estado de Minas Gerais, Brasil: Begoniaceae C. Agardh

Delfini

Cabral

Oliveira

et al. 2018

Hoehnea

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RESUMO O presente estudo refere-se ao levantamento das espécies de Begoniaceae ocorrentes no Parque Estadual do Ibitipoca (PEIB), Minas Gerais, Brasil. No Parque foram encontradas oito espécies de Begonia (B. altamiroi, B. angularis, B. angulata, B. apparicioi, cucullata, B. fischeri, B. luxurians e B. rufa), as quais são diferenciadas principalmente pelo hábito e por características das folhas (indumento e forma das lâminas). Do total, seis espécies são exclusivas do Brasil e cinco endêmicas da Mata Atlântica. Este estudo baseou-se em bibliografia, consulta aos principais herbários do país e observações de campo. Constam, também, descrições, ilustrações e comentários para cada espécie, assim como uma chave de identificação para todas as espécies.

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Velloziaceae do Parque Estadual de Ibitipoca, Minas Gerais, Brasil

Cited by 4 publications

References 12 publications

Oil-resin glands in Velloziaceae flowers: structure, ontogenesis and secretion

Oil-resin glands in Velloziaceae flowers: structure, ontogenesis and secretion

Zoomingin on quartzitic outcrops: micro-habitat influences on flora and vegetation

Flora do Parque Estadual do Ibitipoca, Estado de Minas Gerais, Brasil: Begoniaceae C. Agardh

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