Magdalena Vaio

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DNA content was estimated by flow cytometry in seventeen taxa from the Dilatata, Quadrifaria and Paniculata groups of Paspalum and five synthetic hybrids. Results were compared to known genome constitutions and phylogenetic relationships. DNA 2C-values ranged from 1.24 pg in diploid P. juergensii to 3.79 pg in a hexaploid biotype of P. dilatatum. The I(More)
With about 350 species, Paspalum is one of the richest genera within the Poaceae. Its species inhabit ecologically diverse areas along the Americas and they are largely responsible for the biodiversity of grassland ecosystems in South America. Despite its size and relevance, no phylogeny of the genus as a whole is currently available and infrageneric(More)
BACKGROUND AND AIMS The Quadrifaria group of Paspalum (Poaceae, Paniceae) comprises species native to the subtropical and temperate regions of South America. The purpose of this research was to characterize the I genomes in five species of this group and to establish phylogenetic relationships among them. METHODS Prometaphase chromatin condensation(More)
PREMISE OF THE STUDY The American bulb-bearing Oxalis (Oxalidaceae) have diverse heterostylous breeding systems and are distributed in mountainous areas from Patagonia to the northeastern United States. To study the evolutionary processes leading to this diversity, we constructed the first molecular phylogeny for the American bulb-bearing Oxalis and used it(More)
Paspalum quadrifarium Lam. is a bunchgrass native to Uruguay, Argentina, and southern Brazil. Diploid, triploid, tetraploid and hexaploid cytotypes have been reported for this species of the Quadrifaria group of Paspalum. In this group, a high degree of cytogenetic homology between the genomes of several diploid species has been reported, based on meiotic(More)
Records of the occurrence of wild relatives of maize in South American lowlands are unprecedented, especially in sympatric coexistence with landraces. This fact is relevant, because regions of occurrence of wild relatives of cultivated plants should be a priority for conservation, even if they do not correspond to the center of origin of the species. The(More)
Nassella is one of the largest genera in the tribe Stipeae with approximately 116 species, distributed from Canada to Uruguay and Argentina. Although there are strong morphological characters that distinguish this genus from the rest of the tribe, molecular phylogenetic analyses have shown that it is a polyphyletic genus closely related to Jarava and(More)
Oxalis section Articulatae Knuth (Oxalidaceae) comprises a group of five species with a restricted distribution in the southern part of South America. To assess the current circumscription of section Articulatae and the evolutionary mechanisms involved in its diversification, we used three plastid DNA sequences and the nuclear ribosomal transcribed spacer(More)
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