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‣ Karyological studies in Chilean species of Bomarea and Leontochir (Alstroemeriaceae)

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
Tipo: Artículo de Revista
Português
Relevância na Pesquisa
50.79686%
Species from two genera belonging to the Alstroemeriaceae, Bomarea and Leontochir, were cytogenetically studied and compared to determine their detailed karyotypic composition. Bomarea is a polytypic genus represented by 100 species, with a distribution range from Mexico and Antilles (24°N) to Argentina (29°S) and Chile (17-40°S). In contrast Leontochir is a monotypic genus, endemic to the coastal area of the Atacama Desert in Chile (28°S). Bomarea salsilla, B. involucrosa, and Leontochir ovallei have a karyotype 2n = 18 with similar chromosome morphology. These data confirm the close relationship between both genera, suggested by earlier studies.

‣ C-banding pattern in the geophytic Leontochir ovallei (Alstroemeriaceae)

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
Tipo: Artículo de Revista
Português
Relevância na Pesquisa
72.558823%
The monotypic genus Leontochir Phil. (Alstroemeriaceae Dumortier), represented by Leontochir ovallei, is endemic to Chile, and its geographical distribution is restricted to the coastal zone of the Atacama Desert (28°S). In previous cytogenetic studies on L. ovallei a diploid karyotype 2n = 2x = 18 was described. In this work a first analysis of the C-banding pattern of L. ovallei is presented. L. ovallei showed large regions of constitutive heterochromatin within the karyotype, with C-bands on all chromosome pairs except 9. The relative length of the C-bands was 20.0% of the total haploid set length. The presence of large regions of constitutive heterochromatin on the chromosomes was concurrent with the presence of many conspicuous and large chromocenters in the interphase nuclei. According to these results, L. ovallei shows the largest value of relative C-band length so far described within the Alstroemeriaceae. These cytogenetic results on L. ovallei increase the available data on C-banding patterns in Alstroemeriaceae with an additional genus.

‣ Genetic diversity of wild species and cultivated varieties of alstroemeria estimated through morphological descriptors and RAPD markers

Infante Espiñeira, Rodrigo Arturo; Meneses, Claudio; Aros Orellana, Danilo
Fonte: ELSEVIER Publicador: ELSEVIER
Tipo: Artículo de revista
Português
Relevância na Pesquisa
29.984038%
In order to estimate the genetic diversity within the Alstroemeriaceae family, nine wild alstroemeria accessions. 10 commercial varieties and the monotype Leontochir ovallei were evaluated using two different methods. RAPD analysis and UPOVs morphological descriptors. DNA from leaves, roots and tepals were analyzed by RAPDs with eight primers that generated 236 RAPD bands, Dendrograms obtained allowed identification of five main clusters: A. garaventae alone, wild alstroemerias, commercial varieties, A. exserens and A. spathulata together. and L. ovallei. Twenty-five morphological descriptors related to stem, leaf and inflorescence characteristics were evaluated and a resulting dendrogram was analyzed containing two main clusters: one grouping all commercial varieties plus A. magnifica ssp. magnifica and the other one with the rest of the wild alstroemerias. With both methods, enough informative information data was obtained to place the wild alstroemerias and commercial varieties, hierarchically in different clusters. In this respect, morphological analysis grouped all commercial varieties closer to each other, Also, morphological descriptors grouped all wild alstroemerias except A. magnifica ssp. magnifica, whereas RAPD markers grouped seven out of the nine wild alstroemerias...