Anatomia da madeira de quatro espécies do gênero Miconia Ruiz & Pavón (Melastomataceae)

Abstract

RESUMONeste trabalho faz-se a descrição anatômica das madeiras de Miconia cabussu Hoehne, Miconia cinnamomifolia (DC.) Naudin, Miconia rigidiuscula Cogn. e Miconia sellowiana Naudin. As quatro espécies apresentam camadas de crescimento distintas; vasos solitários e em múltiplos; placas de perfuração simples; pontoações intervasculares pequenas, alternas e ornamentadas; parênquima axial paratraqueal escasso; raios integrados por células predominantemente quadradas e eretas; fibras semelhantes a parênquima, septadas e gelatinosas. As características que se mostraram úteis para a separação das espécies foram: demarcação das camadas de crescimento em M. cabussu e M. sellowiana; presença de traqueóides em M. cabussu; pontoações raio-vasculares em M. rigidiuscula e arranjo das fibras semelhantes a parênquima em M. cinnamomifolia. A forma das pontoações intervasculares e a largura dos raios separam as espécies em dois grupos: um inclui M. cabussu e M. cinnamomifolia e o outro, M. rigidiuscula e M. sellowiana. A formação dos grupos está representada em dendrogramas construídos através da análise de agrupamento.Palavras-chaves: Anatomia da madeira, Miconia, Melastomataceae ABSTRACT The wood anatomy of Miconia cabussu Hoehne, Miconia cinnamomifolia (DC.) Naudin, Miconia rigidiuscula Cogn. and Miconia sellowiana Naudin is described. The four species show distinct growth rings; solitary and multiples vessels; simple perforated plates; small, alternate and vestured intervessel pits; paratracheal scanty axial parenchyma; rays are composed by square, upright and few procumbent cells; parenchyma-like fibre; septate and gelatinous fibres. The useful characteristics for separation the species are: growth rings boundaries in M. cabussu and M. sellowiana; vascular tracheids present in M. cabussu; vessel-ray pits in M. rigidiuscula and parenchyma-like fibres arrangement in M. cinnamomifolia. The shape of the intervessel pits and the ray width separate the species into two groups: one includes M. cabussu and M. cinnamomifolia, the other group includes M. rigidiuscula and M. sellowiana. Dendrograms done in the cluster analysis represent these groups.

Trabeculae and Al-accumulation in the wood cells of Melastomataceae species from Brazilian savanna

“…; Ter Welle andKoek-Noorman 1981;Medeiros and Morretes 1994;Marcon and Costa 2000;Sonsin et al 2014;Silva et al 2015).However, in this study we observed the occurrence of trabeculae in vessel elements, and Alaccumulation in septa of fibers, in the G-layer of the gelatinous fibre walls, in the vacuole of ray cells, in the cambial cell walls, and in the walls of immature vessel elements. These features constitute new observations for Melastomataceae species.…”

“…We believe that the absence of growth rings in R. dichotoma plants that grow in a swampy soil site might be related to the constant water availability in the soil while the fluctuation of water availability in the soil where the other species grow would reflect in growth markers in the wood. Melastomataceae species (Détienne and Jacquet 1983, Marcon and Costa 2000, Sonsin et al 2014, Silva et al 2015. The small amount of axial parenchyma and the higher amount of the parenchyma-like fibers rich in starch grains in the studied species support the hypothesis that the parenchyma-like characteristics in fibers might represent a way in which a wood ground tissue functioning like that of parenchyma can be achieved (Spackman andSwamy 1949, Carlquist 2001).…”

Natural products and Chagas’ disease: the action of triterpenes acids isolated from Miconia species

“…Melastomataceae is one of the main families of neotropical flora, with about 5,000 species belonging to 185 genera and 11 tribes. The interest in these plants stems from its eye-catching flowers; in Brazil, Miconia, the largest genus of the Melastomataceae family, is represented by about 250 ornamental species (Martins et al 1996, Marcon & Costa 2000. It is native to the forests of Central and South America extending from southern Mexico, in the north, toward the south through Guatemala, British Honduras, Nicaragua, Costa Rica, Panama, Colombia, Ecuador, Peru, Bolivia, Brazil, Paraguay, and northern Argentina.…”

Natural products and Chagas’ disease: the action of triterpenes acids isolated from Miconia species

“…The interest in these plants stems from its eye-catching flowers; in Brazil, Miconia, the largest genus of the Melastomataceae family, is represented by about 250 ornamental species (Martins et al 1996, Marcon & Costa 2000. It is native to the forests of Central and South America extending from southern Mexico, in the north, toward the south through Guatemala, British Honduras, Nicaragua, Costa Rica, Panama, Colombia, Ecuador, Peru, Bolivia, Brazil, Paraguay, and northern Argentina.…”