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Articles • Rodriguésia 59 (1) • Jan-Mar 2008 • https://doi.org/10.1590/2175-7860200859106   copy

Rhizome and root anatomy of 14 species of Bromeliaceae1 1 Part of the PhD thesis of the first author, Universidade Estadual Paulista, Campus de Rio Claro.

Anatomia de raízes e rizomas de 14 espécies de Bromeliaceae

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The anatomy of rhizomes and roots of 14 species of Bromeliaceae that occur in the cerrado biome were studied with the aim of pointing out particular anatomical features of the family and possible adaptations related to the environment. All the rhizomes are similar although some have root regions growing inside the cortex. In some species the vascular cylinder of the rhizome is clearly limited from the cortex. The roots are also very similar, although the coating tissue differs in roots growing inside the rhizome or externally to it and the cortex has a variable organization according to the region. The studied species present anatomical features that are associated to water absorption and storage, showing that they are adapted to the cerrado environment.

Key words:
bromeliads; Pitcairnioideae; Bromelioideae; Tillandsioideae; water capture; water retention; 'cerrado'

RESUMO

Com o objetivo de reconhecer caracteres particulares de Bromeliaceae e indicar possíveis formas de adaptação ao ambiente, foi estudada a anatomia dos rizomas e raízes de 14 espécies de Bromeliaceae que ocorrem no cerrado. Os rizomas apresentam estrutura básica semelhante, embora alguns deles possuam porções radiculares crescendo no interior de seu córtex. De acordo com a espécie considerada, os rizomas podem apresentar um cilindro vascular de delimitação mais ou menos nítida. As raízes também possuem estrutura básica semelhante, apesar do tecido de revestimento variar de acordo com a porção analisada (dentro do rizoma ou externa). Além disso, as raízes apresentam uma região cortical de organização variada, de acordo com a região do órgão, e um cilindro vascular. Muitos dos caracteres anatômicos observados estão associados a mecanismos de captação e retenção hídrica, mostrando que as espécies estudadas estão adaptadas ao ambiente de cerrado.

Palavras-chave:
bromélias; Pitcairnioideae; Bromelioideae; Tillandsioideae; captura de água; retenção hídrica; cerrado

Full text available only in PDF format.

  • 3
    CNPq fellowship; financial support by FAPESP
  • 1
    Part of the PhD thesis of the first author, Universidade Estadual Paulista, Campus de Rio Claro.

ACKNOWLEDGMENTS

We thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for a Doctoral fellowship (first author) and a Researcher fellowship (second author), and the Projeto Biota - Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) for the financial support.

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Publication Dates

  • Publication in this collection
    Jan-Mar 2008

History

  • Received
    June 2007
  • Accepted
    Jan 2008
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