Estrutura foliar de espécies de Aechmea Ruiz & Pav. (Bromeliaceae) do Estado de São Paulo, Brasil

Abstract

O estudo da estrutura foliar de Aechmea bromeliifolia (Rudge) Baker, A. distichantha Lem., A. ornata Baker, A. nudicaulis (L.) Griseb., A. pectinata Baker, A. coelestis (K. Koch) E. Morren, A. cylindrata Lindm. e A. gracilis Lindm. mostrou que, em todas as espécies, as folhas são hipoestomáticas e revestidas por células epidérmicas de paredes sinuosas e portadoras de corpos silicosos. Apresentam também hipoderme mecânica e aqüífera, escamas nas duas superfícies e canais de aeração, interrompidos por diafragmas de células braciformes, no parênquima clorofiliano. A ocorrência restrita de algumas características permitiu elaborar uma chave de identificação para os representantes estudados. Tais características incluem a ocorrência de grupos de fibras extravasculares, de parênquima paliçádico adaxial, de extensão de bainha nos feixes vasculares de menor calibre, de obstrução nas câmaras subestomáticas, além de variação na espessura da hipoderme aqüífera e no número de células que formam o pedículo das escamas.

Anatomy of the floral scape of Bromeliaceae

“…Silica bodies also occur in other Poales, such as Poaceae, Cyperaceae, Thurniaceae, Rapateaceae, Centrolepidaceae, Ecdeiocoleaceae and Joinvilleaceae , suggesting that this feature is a plesiomorphy for the order. In Bromeliaceae, the silica bodies are always of spherical shape and only occur in the epidermal cells as reported by Krauss (1948Krauss ( , 1949a, Tomlinson (1969), Flores (1975), Souza & Neves (1996), Sajo et al (1998), Aoyama & Sajo (2003), Arruda & Costa (2003), Proença & Sajo (2004), Scatena & Segecin (2005), Sousa et al (2005) and Proença & Sajo (2007) for both vegetative and reproductive organs. This fact corroborates the supposition of Prychid et al (2004) for whom the shape and localization of these bodies, although genetically controlled and little influenced by environmental factors, can present a systematic potential for some groups of monocotyledons.…”

Are the wing's cells alive? Study case in Vriesea trichomes

“…Recent studies carried out by Aoyama & Sajo (2003), Proença & Sajo (2004, 2007, Scatena & Segecin (2005), Souza et al (2005), Monteiro, Forzza & Mantovani (2011), Silva, Oliveira & Scatena (2011 and Mantovani et al (2012) describe absorbent peltate trichomes in different genera of Bromeliaceae, but make no reference to the content of these cells. Moreover, an anatomic study on species of the genus Vriesea carried out by Arruda & Costa (2003) mentioned the presence of cytoplasm in the wing cells.…”

“…These authors have also described the basal stalk and the domecells with densely cytoplasmic contents. Recently, studies elaborated by Proença & Sajo (2004, 2007 …”

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

“…(2003) and Scatena and Segecin (2005) have also described these structures in other bromeliad species. Although Smith and Downs (1974) suggested that a palisade chlorenchyma is not a common character in the Bromeliaceae, Proença and Sajo (2004) reported the presence of this tissue in an exemplar of A. bromeliifolia from São Paulo state, southeastern Brazil. The authors, however, did not specify whether the specimen analyzed The species analyzed show several xeromorphic characters commonly reported for Bromeliaceae (e.g.…”

“…For Aechmea, foliar anatomical aspects have been investigated in descriptive works (Tomlinson 1969, Smith and Downs 1974, Flores 1975, Braga 1977, Benzing 2000b, using an ecophysiological approach (Scarano et al 2002), or used as a tool for taxonomic delimitations of the subgenera Lamprococcus (Aoyama and Sajo 2003) and Chevaliera (Sousa et al 2005) and for species of the genus occurring in São Paulo state, southeast Brazil (Proença and Sajo 2004).…”