Abstract:MICROMORFOMETRIA FOLIAR DE PALICOUREA RIGIDA KUNTH. (RUBIACEAE) EM AMBIENTE DE CERRADO E CAMPO RUPESTRERESUMO: Este trabalho teve como objetivo um estudo anatômico descritivo e quantitativo da estrutura foliar de Palicourea rigida Kunth. (Rubiaceae), espécie que ocorre em áreas de cerrado e campo rupestre. As observações anatômicas foram realizadas em folhas de material fresco ou fixado, tratadas segundo metodologias usuais em anatomia vegetal. Foram observadas as seguintes características: epidermes do pecíol… Show more
“…All of the studied species present a thickening in the periclinal walls of the ordinary epidermal cells; a feature that is also found in other plants from high altitudes (Körner et al 1989;Gavilanes et al 2016). Such thickening can be an adaptation to the environmental conditions present at high altitudes, serving as a filter to reflect or absorb the high UV-radiation (Robberecht et al 1980), thus compensating for the thin cuticle layer observed in all of the studied species.…”
Section: Ecological Interpretationsupporting
confidence: 69%
“…In addition to its contribution to taxonomy and systematics, the knowledge of plant anatomy can be useful for identifying local adaptations, when the environmental context is considered (e.g., Starr 1912;Hayden 1919;Metcalfe and Chalk 1979;Morretes 1980;Mott and Michaelson 1991;Somavilla and Graciano-Ribeiro 2011;Aguiar-Dias et al 2012;Jakovljevic ´et al 2014;Sanso et al 2014;Perrone et al 2015;Gavilanes et al 2016).…”
Baccharis L. is an important genus in the high-altitude environments of South America. In the State of Rio de Janeiro, southeastern Brazil, the greatest richness is found at montane and high-montane ecological refuges, known as high-altitude grasslands. The high altitude provides several environmental factors that turn the high-altitude grasslands into singular tropical habitats. In this article we describe the leaf anatomy of six shrubby species of Baccharis, pointing out ecological aspects of the structures, and testing the use of statistical analyses to compare the species. Using light and scanning electron microscopy, we compared the anatomical features of the leaves and performed a cluster and principal component analyses. The results show novel features in the leaf anatomy for the genus, such as an undulated cuticle, three secretory ducts in the midrib, secretory ducts associated with the xylem, and biseriate glandular trichomes with an irregular organization of the cells. Our statistical analyses indicate that the anatomical features of the leaves, especially trichomes, are useful for distinguishing the different species, whereas others, such as isobilateral mesophyll, amphistomatic leaves, and an epidermis with thick cell walls correlate with their high-elevation habitat.
“…All of the studied species present a thickening in the periclinal walls of the ordinary epidermal cells; a feature that is also found in other plants from high altitudes (Körner et al 1989;Gavilanes et al 2016). Such thickening can be an adaptation to the environmental conditions present at high altitudes, serving as a filter to reflect or absorb the high UV-radiation (Robberecht et al 1980), thus compensating for the thin cuticle layer observed in all of the studied species.…”
Section: Ecological Interpretationsupporting
confidence: 69%
“…In addition to its contribution to taxonomy and systematics, the knowledge of plant anatomy can be useful for identifying local adaptations, when the environmental context is considered (e.g., Starr 1912;Hayden 1919;Metcalfe and Chalk 1979;Morretes 1980;Mott and Michaelson 1991;Somavilla and Graciano-Ribeiro 2011;Aguiar-Dias et al 2012;Jakovljevic ´et al 2014;Sanso et al 2014;Perrone et al 2015;Gavilanes et al 2016).…”
Baccharis L. is an important genus in the high-altitude environments of South America. In the State of Rio de Janeiro, southeastern Brazil, the greatest richness is found at montane and high-montane ecological refuges, known as high-altitude grasslands. The high altitude provides several environmental factors that turn the high-altitude grasslands into singular tropical habitats. In this article we describe the leaf anatomy of six shrubby species of Baccharis, pointing out ecological aspects of the structures, and testing the use of statistical analyses to compare the species. Using light and scanning electron microscopy, we compared the anatomical features of the leaves and performed a cluster and principal component analyses. The results show novel features in the leaf anatomy for the genus, such as an undulated cuticle, three secretory ducts in the midrib, secretory ducts associated with the xylem, and biseriate glandular trichomes with an irregular organization of the cells. Our statistical analyses indicate that the anatomical features of the leaves, especially trichomes, are useful for distinguishing the different species, whereas others, such as isobilateral mesophyll, amphistomatic leaves, and an epidermis with thick cell walls correlate with their high-elevation habitat.
“…Some species demonstrated grouped stomata (described as twinned stomata by Accorsi [1947]) or malformed subsidiary cells; those finding agree with the studies of Mantovani et al (1995) and Gavilanes et al 2016. Accorsi (1947 reported the presence of twinned stomata in 39.45% of a total of 601 Rubiaceae species.…”
Resumo Dada a importância dos caracteres anatômicos para delimitação de subgrupos de Rubiaceae, a dificuldade na identificação de determinados táxons, bem como aa escassez de trabalhos sobre o grupo no semiárido, este trabalho objetivou caracterizar a anatomia das folhas de 15 espécies pertencentes aos gêneros Borreria (2), Cordiera (1), Eumachia (1), Hexasepalum (4), Mitracarpus (4), Richardia (1), Staelia (1) e Tocoyena (1) coletados na APA Serra Branca/Raso da Catarina (Jeremoabo-BA, Brasil), e destacar os elementos úteis para subsidiar a taxonomia do grupo. Os resultados mostraram que houve variação quanto ao formato e contorno das células epidérmicas, presença, ausência e tipos de tricomas, tipo de mesofilo, posição e tipo de estômato, formato das células subsidiárias, organização do sistema vascular, ocorrência de células coletoras e estômatos geminados. Foi observado que as características anatômicas, quando utilizadas em conjunto, servem como uma boa ferramenta taxonômica na separação de gêneros e espécies de Rubiaceae.
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