Anatomia de raízes de espécies de Orchidaceae do Parque Estadual da Serra do Brigadeiro, Minas Gerais

Abstract

-(Anatomy of root of Orchidaceae species of Parque Estadual da Serra do Brigadeiro, Minas Gerais). The present study characterized the root of some orchids occurring in an altitudinal field at the Parque Estadual da Serra do Brigadeiro, pointing out both ecological and taxonomical relevant characters. Only terrestrial individuals were studied, except for P. teres, a rupestrine species. Anatomical comparative analysis of the studied species reveled clear definitions of

Use of anatomical root markers for species identification in Catasetum (Orchidaceae) at the Portal da Amazônia region, MT, Brazil

“…For the majority of species studied, the peripheral velamen layer differentiates into absorbent epivelamen cells. This characteristic was also reported for other representatives of Catasetinae (Stern and Judd 2001;Silva et al 2010;Pedroso-de-Moraes et al 2012). In Clowesia amazonica (Pedroso-de-Moraes et al 2012) the cells of the epivelamen are the same size of the inner ones, as also reported for some Cymbidieae (Pridgeon et al 2009), the tribe in which Catasetinae is included.…”

“…The roots studied here have anatomical characters previously described for Orchidaceae in the following ways: multi-layered velamen, uniseriate endodermis and pericycle, polyarch vascular cylinder, and central vascular cylinder with parechymatous, thick-walled cells. These structures characterize the studied species and other Orchidaeceae species examined (Stern and Judd 2001;Silva et al 2010;Pedrosode-Moraes et al 2012).…”

Anatomia comparada dos órgãos vegetativos de espécies de Bulbophyllum seção Didactyle (Lindl.) Cogn. e Bulbophyllum seção Xiphizusa Rchb.f. (Orchidaceae)

“…Essa característica pode ser associada às células amplas, com parede anticlinal resistente, que mantêm a estrutura celular. Embora Silva et al (2010) acreditem que os fatores ambientais possam influenciar no número de camadas de velame em Orchidaceae, Moreira & Isaías (2008) verificaram que essa característica não muda em diferentes condições ambientais. O padrão uni-ou biestratificado típico de Bulbophyllum (Porembsk & Barthlott 1988, Gravendeel et al 2014) também ocorre nas espécies de Bulbophyllum do velho mundo (Mohana Rao & Khasim 1987), e, embora com apenas uma camada de células, é eficiente para as espécies epífitas e rupícolas neotropicais aqui analisadas.…”

“…Os caracteres anatômicos vegetativos mais utilizados para a família são o número de camadas de velame; presença de tilossomos; tipo de espessamento da exoderme e endoderme; espessamento da cutícula da folha e do pseudobulbo; tipo de tricomas; presença de cristais, idioblastos com parede espessada (folha e pseudobulbo) e idioblastos mucilaginosos; mesofilo homogêneo ou heterogêneo; disposição dos feixes vasculares no mesofilo; e presença de coléteres (Pridgeon 1982, Porembsk & Barthlott 1988, Scatena & Nunes 1996, Stern & Judd 2001, Yukawa & Stern 2002, Figueroa et al 2008, Carlsward & Stern 2009, Silva et al 2010, Aybeke 2012, Smidt et al 2013, Cardoso et al 2014.…”

Leaf Anatomy of <i>Prosthechea moojenii</i> (Pabst) W. E. Higgins and <i>P. silvana</i> Cath. & V. P. Castro (Orchidaceae) as an Approach to Taxonomy of Species Occurring in Biomes Cerrado and Atlantic Forest of the Bahia

“…The presence of a velame is typically observed in Orchidaceae as well as in other groups of monocotyledonae such as Velloziaceae [15] and Bromeliaceae [16,17] and referred by [9] for other species of the Prosthechea genus and by [18] that studied the roots of various species of different genera of Orchidaceae, as an important characteristic for the water retention which permits its reservation and temporary mobility and for the mechanical protection.…”