A contribuição da anatomia foliar para a taxonomia de Raddia Bertol. (Poaceae: Bambusoideae)

Abstract

Raddia é um gênero de bambus herbáceos que inclui nove espécies ocorrentes no Brasil, uma delas encontrada também em áreas extra-brasileiras. A anatomia foliar de todas as espécies foi analisada em microscopia óptica e microscopia eletrônica de varredura, visando à obtenção de caracteres úteis para sua taxonomia. Espécies de outros gêneros de bambus herbáceos foram utilizadas para comparação. Não foram encontrados caracteres anatômicos exclusivos de Raddia, e os mesmos foram pouco relevantes para a delimitação das espécies dentro do gênero, separando às vezes, apenas grupos de espécies. Entre estes caracteres, destacaram-se, em corte transversal: forma da nervura central, posição do feixe vascular mediano, número de feixes vasculares adjacentes ao feixe mediano e a forma das células fusóides. A análise da epiderme em vista frontal (MEV) mostrou diferenças entre as espécies quanto à ocorrência, densidade e distribuição de papilas. Raddia megaphylla R.P. Oliveira & Longhi-Wagner e R. guianensis (Brongn.) Hitchc. & Chase apresentaram maior número de caracteres anatômicos exclusivos, entre as espécies estudadas. Um tipo de tricoma não registrado anteriormente para Bambusoideae foi encontrado em R. stolonifera R.P. Oliveira & Longhi-Wagner.

Comparative analysis of the leaf anatomy in two Parodiolyra species (Poaceae: Olyreae) occurring on forests in Eastern Brazil

“…In P. ramosissima these trichomes were observed only in the abaxial surface (Figures 7, 11-12). These prickle-hairs occur in several other herbaceous bamboos, as in Pariana (Oliveira et al, 2008a) and Raddia (Oliveira et al, 2008b). We also observed bicellular trichomes (microhairs) (Figure 13), which were found in both species and on both surfaces, with higher density on the abaxial surface.…”

“…Both species are amphistomatic, having fewer stomata on the adaxial surface. This was also observed by Vieira et al (2002) in leaf blades of Raddia brasiliensis Bertol., while Oliveira et al (2008a) indicate that this pattern occur in only one (R. portoi Kuhlm.) of the nine species of this genus, the remaining species being hypostomatic.…”

“…However, the effectiveness of these and other characters for the taxonomy of the group has been little evaluated, especially with regard to herbaceous groups. The available literature indicates that these characters can vary little within a genus, as indicated in Oliveira et al (2008a) for Raddia Bertol., or they can vary considerably and even help in specific delimitation, as for instance within Pariana Aubl. in Eastern Brazil (Oliveira et al, 2008b).…”

The utility of Bambusoideae (Poaceae, Poales) leaf blade anatomy for identification and systematics

“…For this reason, searching for vegetative characters in addition to the reproductive ones is highly important to aid in species identification, and anatomical features often have provided useful findings (e.g. Brandis, 1907;Prat, 1936;Brown, 1958;Metcalfe, 1960;Calderón and Soderstrom, 1973;Renvoize, 1987;Vieira et al, 2002;Guglieri et al, 2008;Oliveira et al, 2008;Pelegrin et al, 2009;Jesus Junior et al, 2012;Viana et al, 2013a, b;Leandro et al, 2016;Aliscioni et al, 2016).…”

Leaf anatomy and its contribution to the systematics of Aechmea subgenus Macrochordion (de Vriese) Baker (Bromeliaceae)

“…The function and adaptive value of anatomical features are often extremely useful as they may help to reveal more clearly the homologies of structures for classification purposes and reconstruction of phylogeny (Stuessy 1990). Structural aspects of some vegetative organs, for example, have contributed to the generic/infrageneric delimitation of many groups (Weiner and Liese 1993, Starr and Ford 2001, Alves et al 2002, Calvente et al 2008, Oliveira et al 2008, Cardoso et al 2009). …”