Micromorphology of the upper anthecium in Mesosetum Steud. and related genera (Poaceae, Arthropogoninae) and its taxonomic applications
Tipo de material:
ArtigoAssunto(s): Recursos online:
Em: Rodriguésia (Brazil) v. 66(2) p. 645-657; (2015)Sumário:
Abstract
Mesosetum is a Neotropical genus with 25 species, and 21 of them occur in Brazil. Mesosetum forms a clade
closely related with Keratochlaenarigidifolia and Tatianyx arnacites. The objective of this work was to establish
the taxonomic value of the upper anthecium micromorphology for the group. A total of 96 specimens,
representing all Mesosetum species(except M. wrightii), K. rigidifolia and T. arnacites were examined under a
scanning electron microscope (SEM). PCA and UPGMA analysis were applied using the micromorphological
characters. Fifithteen useful taxonomic characters were identified. We highlight the following characters to
distinguish the Mesosetum species: the presence, type and distribution of papillae on the abaxial surface of the
upper lemma; the presence of unicellular macrohairs and bicellular microhairs; presence or absence of silica
cells and the structure of the germination lid. The present work shows that the micromorphological characters
identified are important taxonomically at the specific level, allowing the species identification in many cases.
Key words: Grass, Keratochlaena, Tatianyx, PCA, UPGMA.
| Tipo de material | Biblioteca atual | Número de chamada | Informaçaõ do volume | URL | Situação | Devolução em | Código de barras |
|---|---|---|---|---|---|---|---|
Periódicos
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Biblioteca Nacional de Agricultura - Binagri | 2015 66(2) | Texto integral (PDF) | Não pode ser emprestado | 2025-1431 |
Publicação on-line; 33 ref.; 3 tables; 4 illus.; Summary (En)
Abstract
Mesosetum is a Neotropical genus with 25 species, and 21 of them occur in Brazil. Mesosetum forms a clade
closely related with Keratochlaenarigidifolia and Tatianyx arnacites. The objective of this work was to establish
the taxonomic value of the upper anthecium micromorphology for the group. A total of 96 specimens,
representing all Mesosetum species(except M. wrightii), K. rigidifolia and T. arnacites were examined under a
scanning electron microscope (SEM). PCA and UPGMA analysis were applied using the micromorphological
characters. Fifithteen useful taxonomic characters were identified. We highlight the following characters to
distinguish the Mesosetum species: the presence, type and distribution of papillae on the abaxial surface of the
upper lemma; the presence of unicellular macrohairs and bicellular microhairs; presence or absence of silica
cells and the structure of the germination lid. The present work shows that the micromorphological characters
identified are important taxonomically at the specific level, allowing the species identification in many cases.
Key words: Grass, Keratochlaena, Tatianyx, PCA, UPGMA.
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