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Citología, morfología y taxonomía del género bulbostylis (cyperaceae) para América Austral
María Gabriela López Aveliano Fernández Rosa E. Guaglianone
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Resumen/Descripción – provisto por el repositorio digital
Bulbostylis Kunth includes approximately 150 species from tropical and subtropical habitats throughout the world. Some species can be found in temperate areas, with the southern limit of the genus in South America at 42 ° S. The genus has two important centers of diversity: África and South America (especially central Brazil). Most species are found in open habitats such as savannas often sandy soils and damp at least part of the year. This paper deals the genus Bulbostylis for Southern America (Brasil: Paraná, Santa Catarina y Rio Grande do Sul; Paraguay; Argentina; Chile y Uruguay) Taxonomic and anatomical studies were made to elucidate the nomenclatural problems and species delimitation. Maps showing the area of all recognized taxa were presented. Descriptions of the characters of taxonomic and identification keys were made. For the study area were recognized 19 specific names, varieties and forms. In herbarium consult were found abundant material with wrong identifications, possibly as a result of the similarity in the overall appearance of the plants and that the keys not involve stable characters for the taxa. As a result of this study were described and illustrated 24 species and 2 varieties. Were proposed as new synonyms 5 names, 11 varieties and 7 forms; lectotypes 5 species and 3 varieties; neotypes rises to the rank of species one form, was rehabilitated a new varietal name, has extended the range of four species, Bulbostylis arenaria (Nees) Lindm. B. capillaris (L.) C. B. Clarke, B. conifera (Kunth) C.B. Clarke, B. fendleri C. B. Clarke, B. filamentosa (Vahl) C. B. Clarke y B. fimbriata (Nees) C. B. Clarke were excluded from the study area and described six new species and a new variety. In the genus Bulbostylis as in other genera of Cyperaceae, the exomorphology fruit is one of the more stable characters for infra and intergeneric classification were described comparatively exomorphological characters of the fruit. We also performed the microanalysis of the fruit. In some way off the silicon bodies take different forms "silica phytolith" and not others, to see if there are differences in the formation of these two types of fruit, we analyzed the ontogeny of two species, Bulbostylis sphaerolepis (Boeck.) Beetle, forming silica bodies and B. communis M. G. López ined., that not formed silica bodies. The only phylogeny that is so far to the tribe Abildgaardiae takes only 6 species of Bulbostylis, which represent 4% of the genus. There are no records of morphological phylogenetic analysis, molecular or within the genus Bulbostylis, so this analysis is the first approach to elucidate interspecific phylogenetic relationships Due to phylogenetic hypothesis for Bulbostylis does not exist we propose here a morphological cladistic study, to explore the phylogenetic relationships to explore the phylogenetic relationships of the species to Austral America Bulbostylis and discuss the groupings established by Clarke (1908), suggestions were based on fruits observations were also analyzed behavior and the value of certain characters. Debido a que no existen hipótesis de filogenia disponibles para Bulbostylis, se hace aquí un estudio cladístico morfológico para explorar las relaciones filogenéticas de las especies de Bulbostylis de América Austral y discutir los agrupamientos establecidos por Clarke (1908) y los aquí sugeridos sobre la base de las observaciones de los frutos. Se analiza además el comportamiento y el valor de ciertos caracteres. New chromosome counts were presented for the genus, it shows that the studied species possess holokinetic chromosomes and notes that present different chromosomes numbers with the same DNA content, size of stomata and pollen grains remained unchanged, confirmed that the karyotype evolution through agmatoploidy or simploidy, not by polyploidy. That was confirmed and documented forming pseudomonads in the genus Bulbostylis.Palabras clave – provistas por el repositorio digital
Citología; Morfología; Taxonomía; América Austral
Disponibilidad
| Institución detectada | Año de publicación | Navegá | Descargá | Solicitá |
|---|---|---|---|---|
| No requiere | 2012 | INTA Digital (SNRD) |
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| No requiere | 2012 | Repositorio Institucional de la Universidad Nacional del Nordeste (SNRD) |
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Información
Tipo de recurso:
tesis
Idiomas de la publicación
- español castellano
País de edición
Argentina
Fecha de publicación
2012
Información sobre licencias CC
