Root and leaf anatomy of some terrestrial representatives of the Cranichideae tribe (Orchidaceae)

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• 作者：Rita de Cássia Andreota ; Fábio de Barros…
• 关键词：Cranichidinae ; Goodyerinae ; Leaf anatomy ; Root anatomy ; Spiranthinae
• 刊名：Brazilian Journal of Botany
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：38
• 期：2
• 页码：367-378
• 全文大小：4,897 KB
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• 作者单位：Rita de Cássia Andreota (1)
  Fábio de Barros (2)
  Maria das Gra?as Sajo (1)
  
  1. Departamento de Botanica, Instituto de Biociências, Universidade Estadual Paulista -UNESP, Avenida, 24 A, 1515, Bela Vista, Rio Claro, S?o Paulo, CEP 13506-900, Brazil
  2. Instituto de Botanica, Secretaria Estadual do Meio Ambiente, Se??o de Orquidário do Estado, Avenida, Miguel Estefano, 3687, água Funda, S?o Paulo, S?o Paulo, CEP 04301-012, Brazil
  
• 刊物主题：Plant Systematics/Taxonomy/Biogeography;
• 出版者：Springer International Publishing
• ISSN：1806-9959

文摘

The Orquidaceae family has more than 25,000 species, of which 20?% are terrestrial Cranichideae mainly belonging to the tribe, which is inserted in Orchidoideae, one of the five subfamilies of the Orchidaceae. This group of terrestrial orchids presents a confusing taxonomy and is a poorly known group in terms of their vegetative anatomy in opposition to the epiphytic representatives that have been extensively investigated. This paper describes the root and leaf anatomy of ten species of Cranichideae tribe found in Brazil, belonging to subtribes Cranichidinae, Goodyerinae, and Spiranthinae, comparing their organization to those of the epiphytic plants. We also point out some features that can be useful for the characterization of each subtribe. The roots have studied characteristics that may assist in the absorption and retention of water as the occurrence of velamen and exodermis system, and in the presence of tilossomos Cranichidinae and Spiranthinae. The leaves are narrow with a homogeneous mesophyll, covered by uniseriate epidermis and covered by thin cuticle. The xylem cells are arranged in pairs or inverted V-shape, as in the other orchids Cranichideae tribe.