Genecological differentiation in Nothofagus obliqua (Mirb.) oerst. in Chile

Donoso, Claudio

doi:10.1016/0378-1127(79)90036-7

Cited by 33 publications

(34 citation statements)

References 10 publications

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“…In this sense, the Coastal and Andes Mountains flora present distinct features which arose from a different bedrock, soils, climate, glacial and post-glacial history, showing marked divergences in some tree species . In addition, seed weight shows a clear clinal variation in Nothofagus obliqua (Donoso 1979), N. nervosa (Marchelli and Gallo 1999;Gallo et al 2004) and Austrocedrus chilensis (Pastorino and Gallo 2000). In the case of N. nervosa the populations bearing the northern haplotype in Argentina had significantly higher seed weight than those from the south (Marchelli and Gallo 1999).…”

Section: Geographic Structure and Post-glacial Recolonizationmentioning

confidence: 91%

Multiple ice-age refugia in a southern beech of South America as evidenced by chloroplast DNA markers

Marchelli

Gallo

2006

Conserv Genet

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Chloroplast DNA polymorphisms were analysed to infer the post-glacial history of Nothofagus nervosa (Phil.) Dim. et Mil., a species endemic to South American Temperate Forests. Two hypotheses were postulated to explain the current distribution of the species in relation to the refugia proposed after palynological studies and the time elapsed since Last Glacial Maximum. If refugia were located only in the Coastal Mountains, as pollen records suggests, long-distance dispersal events should be invoked to explain the current occurrence of the species in southern latitudes. The alternative hypothesis is the existence of cryptic refugia in southern latitudes. A total of 26 populations covering the entire geographical range of the species in Chile and Argentina were analysed through PCR-RFLP. Five haplotypes were identified, and a very low intrapopulation variation was observed together with a high gene differentiation (G ST =0.93). The haplotypes showed a highly structured geographic distribution, separating populations located in the Pacific Coastal Mountains from those coming from the easterly located Andes Mountains. Moreover, among the populations of the Andes Mountains a north-south variation in the distribution of haplotypes was found. The results strongly suggest the persistence of the species in several ice-age refugia. The possible location of such refugia is discussed in combination with the available palynological data.

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Section: Geographic Structure and Post-glacial Recolonizationmentioning

confidence: 91%

Multiple ice-age refugia in a southern beech of South America as evidenced by chloroplast DNA markers

Marchelli

Gallo

2006

Conserv Genet

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“…According to Donoso (1979), marginal climates for seed development at higher elevation can lead to incomplete seed maturation, which is sometimes hard to detect visually in the seed but can be revealed during germination and subsequent seedling development (Edwards 1980). In the present study, the pre-Andean provenance had a significantly lower average germination capacity (33.1%) than the coastal provenance (40.2%), which could indicate that germination is related to the different elevational distribution of the two provenances.…”

Section: Error 84mentioning

confidence: 99%

Variability in seed germination and seedling growth at the intra- and inter-provenance levels of Nothofagus glauca (Lophozonia glauca), an endemic species of Central Chile

Moya

Meza

Díaz

et al. 2017

N.Z. j. of For. Sci.

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Background: Patterns of seed germination and subsequent seedling growth of the endemic species Nothofagus glauca (Phil.) Krasser (Lophozonia glauca) (Hualo) were studied in two provenances from Mediterranean Central Chile (pre-Andean mountain range provenance and coastal range provenance). The main aim of the study was to determine differences in seed germination and seedling growth at the intra-and inter-provenance levels. Methods: The experiment was carried out with seeds from two provenances and four to five different sites from each provenance. Seed germination tests were conducted in 10 × 1 m beds in a greenhouse. Germinated seeds were sown in 140-mL containers and cultivated under nursery conditions for 8 months. After that period, growth and survival were measured. Results: Germination, growth and survival were highly variable at the intra-provenance level. Sites from the pre-Andean mountain range provenance exhibited lower germination capacity (33.1%) and seedling survival (76.3%) than sites from the Coastal range provenance (40.2 and 91.3%, respectively). Conclusions: Provenance variability was important for seed mass and germination, and seedling survival, while intra-provenance variability was systematically higher, whatever the functional trait considered, indicating a high potential capacity of the species to adapt to climate change. This intra-provenance variability must be conserved with the use of local seed. In our case, pre-Andean sites must be established in high-elevation environments, while coastal provenances must be restricted to more lowland and coastal environments.

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“…The large seed size observed in Lagunas de Epulauquen could be a consequence of genecological variation, as found for N. obliqua in Chile (Donoso 1979). The largest seed size of the northernmost N. obliqua populations was explained as an adaptation to xeric environments within a wide latitudinal species cline.…”

Section: Discussionmentioning

confidence: 63%

Robles in Lagunas de Epulauquen, Argentina: previous and recent evidence of their distinctive character

Azpilicueta

Pastorino

Puntieri

et al. 2014

Rev. Chil. de Hist. Nat.

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The northernmost 'robles' of Argentina, located in Lagunas de Epulauquen (northwest Patagonia), are considered a population of Nothofagus obliqua, even though they differ in some respects from individuals of other populations of the species. In order to analyse a possible genetic basis of their distinctive character, we revised previous information and added new evidence based on biochemical (isozyme) and molecular (chloroplast DNA and nuclear microsatellite) markers, as well as quantitative trait variation (seed traits, leaf morphology, plant architecture and field performance). The comparison of Lagunas de Epulauquen specimens with specimens from other areas in Argentina demonstrated their genetic distinction. Glacial history, in conjunction with hybridisation processes, provides support for the main hypothesis to explain these results. Future research lines are proposed, aimed at identifying the taxonomic status of the Lagunas de Epulauquen population. The conservation value of these forests is highlighted.Keywords: Nothofagus obliqua; Taxonomy; Patagonia; Glacial history; Interspecific hybridisation ResumenLos robles más septentrionales de la Argentina, ubicados en Lagunas de Epulauquen (noroeste de Patagonia) son considerados una población de la especie Nothofagus obliqua, pero presentan características diferenciales respecto al resto de las poblaciones argentinas de esa especie. El presente trabajo reúne información generada previamente y otra original que demuestra el carácter genéticamente distintivo de esa población. Se presentan los resultados logrados a través de análisis genéticos con marcadores bioquímicos (isoenzimas) y moleculares (de ADN de cloroplasto y marcadores de microsatélites nucleares), con caracteres cuantitativos seminales, de morfología foliar, de arquitectura de las plantas y de aptitud a campo. La historia glacial de la región, en conjunción con procesos de hibridación pasados, se postula como la causa de esta diferenciación. Se propone la realización de nuevas líneas de investigación que permitan confirmar o re-definir el estatus taxonómico de los árboles de esta población. Adicionalmente se presenta una breve consideración sobre el valor de conservación de los bosques en Lagunas de Epulauquen, en relación a los resultados aquí presentados.

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Genecological differentiation in Nothofagus obliqua (Mirb.) oerst. in Chile

Cited by 33 publications

References 10 publications

Multiple ice-age refugia in a southern beech of South America as evidenced by chloroplast DNA markers

Multiple ice-age refugia in a southern beech of South America as evidenced by chloroplast DNA markers

Variability in seed germination and seedling growth at the intra- and inter-provenance levels of Nothofagus glauca (Lophozonia glauca), an endemic species of Central Chile

Robles in Lagunas de Epulauquen, Argentina: previous and recent evidence of their distinctive character

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