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Desarrollo del gametofito y esporofito joven de Pteris chilensis Desv. (Pteridaceae-Pteridophyta) Gayana Botánica
Letelier,Luis; Peñailillo,Patricio.
El cultivo ex situ de Pteris chilensis Desv. a partir de esporas es presentado. La germinación de las esporas ocurre a los 10-12 días y el patrón de germinación es del tipo Vittaria. Un gametófito filamentoso de 3-4 células es obtenido a los 23-24 días, logrando su desarrollo adulto entre los 60 a 95 días. Este se caracteriza por ser cordiforme y con alas simétricas. Los arquegonios se forman antes que los anteridios. Finalmente, la primera fronde aparece a los 115 días de sembradas las esporas. Las esporas se cultivaron en agar con medio nutritivo de Thompson, en cámara de cultivo con un fotoperíodo de 12 horas luz (1.500 lux) y una temperatura promedio de 25°C
Tipo: Journal article Palavras-chave: Helechos; Morfogénesis; Chile; Región del Maule.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000100009
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Heterogeneous genetic structure in a natural population of Raulí (Nothofagus nervosa) Ciencia e Investigación Agraria
Carrasco,Basilio; Eaton,Lafayette; Letelier,Luis; Díaz,Carole; García-Gonzáles,Rolando.
Heterozygote deficiencies in natural populations of outbreeding tree species are common and thought to be due mainly to biparental inbreeding. Inbreeding is believed to be caused by family structure within populations, a product of limited seed dispersal and probably limited pollen dispersal. Although both theory and simulation studies predict that structure should be apparent where trees are isolated by distance, most studies of structure in natural populations have detected only a weak spatial genetic structuring. In this contribution, we compare the use of spatial autocorrelation methodology and F statistics with the concept of relatedness to examine the spatial genetic structure in the natural population of a native southern beech and to explore the...
Tipo: Journal article Palavras-chave: Genetic structure; Spatial structure; Raulí; Spatial autocorrelation.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000300014
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Patterns of composition, richness and phylogenetic diversity of woody plant communities of Quillaja saponaria Molina (Quillajaceae) in the Chilean sclerophyllous forest Gayana Botánica
Letelier,Luis; Valderrama,Aly; Stoll,Alexandra; García-Gonzáles,Rolando; González-Rodríguez,Antonio.
ABSTRACT Sclerophyllous forest is among the most representative types of woody plant communities in central Chile where Quillaja saponaria is considered to be one of the most important species. In this study, we analysed the main factors that explain the geographical patterns of variation in composition, richness and phylogenetic diversity of woody plant communities in the Chilean sclerophyllous forest where Quillaja saponaria is present. Vegetation surveys were performed for trees and shrubs in thirty-nine sites from 30° to 38° of latitude South in the Mediterranean biome of Chile. Composition, richness, alfa diversity and phylogenetic diversity metrics of the communities were calculated and associated with spatial (latitude, longitude and altitude),...
Tipo: Journal article Palavras-chave: Diversity; Forest fragmentation; Mediterranean flora; Phylogenetic diversity; Vegetation matrix.
Ano: 2017 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100057
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