Extension Del Limite Sur Para Nothofagus Glauca (Phil.) Krasser

LeQuesne, Carlos; Sandoval, Luis

doi:10.4067/s0717-66432001000200005

Cited by 9 publications

(6 citation statements)

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“…Our data indicate that the limited genetic structure of this species is due to two very isolated populations (Fig. ): the northernmost population Loncha (33), from the highlands of the Coastal Range, and the southernmost population Quilleco (40), from 100 km south of the main geographical range of the species (Le‐Quesne and Sandoval ). The large and heavy N. glauca seeds make it difficult to believe that Quilleco (40) is the result of a 100‐km dispersal event.…”

Section: Discussionmentioning

confidence: 81%

“…In all cases, we only collected samples from pure individuals, that is, individuals with an unambiguous morphological identity for each species. We included two newly described populations that were outside the known range of distribution before 2001, one for N. alpina (Sepulveda and Stoll ) and one for N. glauca (Le‐Quesne and Sandoval ), and regarded the populations described as N. macrocarpa by Vazquez and Rodriguez () (Table ) as N. obliqua , following Donoso (). We did not sample populations from Argentina.…”

Section: Methodsmentioning

confidence: 99%

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Population genetic structure, genetic diversity, and natural history of the South American species of Nothofagus subgenus Lophozonia (Nothofagaceae) inferred from nuclear microsatellite data

Vergara

Gitzendanner

Soltis

et al. 2014

Ecology and Evolution

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The effect of glaciation on the levels and patterns of genetic variation has been well studied in the Northern Hemisphere. However, although glaciation has undoubtedly shaped the genetic structure of plants in the Southern Hemisphere, fewer studies have characterized the effect, and almost none of them using microsatellites. Particularly, complex patterns of genetic structure might be expected in areas such as the Andes, where both latitudinal and altitudinal glacial advance and retreat have molded modern plant communities. We therefore studied the population genetics of three closely related, hybridizing species of Nothofagus (N. obliqua, N. alpina, and N. glauca, all of subgenus Lophozonia; Nothofagaceae) from Chile. To estimate population genetic parameters and infer the influence of the last ice age on the spatial and genetic distribution of these species, we examined and analyzed genetic variability at seven polymorphic microsatellite DNA loci in 640 individuals from 40 populations covering most of the ranges of these species in Chile. Populations showed no significant inbreeding and exhibited relatively high levels of genetic diversity (HE = 0.502–0.662) and slight, but significant, genetic structure (RST = 8.7–16.0%). However, in N. obliqua, the small amount of genetic structure was spatially organized into three well-defined latitudinal groups. Our data may also suggest some introgression of N. alpina genes into N. obliqua in the northern populations. These results allowed us to reconstruct the influence of the last ice age on the genetic structure of these species, suggesting several centers of genetic diversity for N. obliqua and N. alpina, in agreement with the multiple refugia hypothesis.

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Section: Discussionmentioning

confidence: 81%

Section: Methodsmentioning

confidence: 99%

Population genetic structure, genetic diversity, and natural history of the South American species of Nothofagus subgenus Lophozonia (Nothofagaceae) inferred from nuclear microsatellite data

Vergara

Gitzendanner

Soltis

et al. 2014

Ecology and Evolution

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“…Los bosques de N. glauca presentan distribución discontinua entre la Cordillera de la Costa y de Los Andes desde la provincia del Cachapoal en la Región del Libertador Bernardo O'Higgins hasta la provincia del Biobío en la Región del Biobío (Hechenleitner et al 2005). El límite sur se encuentra ubicado a 0,5 km al noreste del poblado de Quilleco, en el límite oriente del Llano Central en la provincia del Biobío (Le-Quesne & Sandoval 2001). En la Cordillera de la Costa se distribuye principalmente desde la localidad de Alhué, al sur de la Región Metropolitana hasta el río Itata, Región del Bíobío, entre los 150 y 800 m s.n.m.…”

Section: Introductionunclassified

Composición, Estructura Y Diversidad De Poblaciones De Nothofagus Glauca Ubicadas en La Zona Mediterranea De Chile

Muñoz¹,

Muñoz²,

Uribe³

et al. 2013

Gayana Bot.

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“…Krasser es endémica de la zona Central de Chile, y muestra una distribución fragmentada en la Cordillera de la Costa y de los Andes. Su área de distribución se encuentra limitada entre la VI Región de O'Higgins, en la provincia del Cachapoal (33°52'S), hasta la VIII Región del Bío-Bío, en la provincia del Bío-Bío (37°27' S; 71°58' W) (Le Quesne & Sandoval 2001, Hechenleitner et al 2005, en asociación estrecha con otras especies del bosque nativo.…”

Section: Introductionunclassified

Influencia de las auxinas sobre el enraizamiento in vitro de microtallos de Nothofagus glauca (Phil.) Krasser

et al. 2012

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RESUMENNothofagus glauca posee una situación privilegiada en asociaciones con especies problemáticas como Nothofagus alessandrii, Beilschmiedia berteroana y Nothofagus leonii, esto multiplica su valor ecológico y paisajístico, por las relaciones en su hábitat nativo. N. glauca se considera clave en determinados hábitats y su pérdida o continua disminución puede afectar directamente a otras especies. La conservación ex situ es una prioridad para el rescate de la especie, por tanto el cultivo de tejidos es, entre otros, uno de los mecanismos alternativos de propagación y conservación de las especies. El objetivo de este estudio fue evaluar el efecto independiente de dos auxinas, ácido naftalenacético (ANA) y ácido 3-indolbutírico (AIB), en el enraizamiento in vitro de microtallos de N. glauca provenientes de subcultivos sucesivos en medio MS como sustrato. Se establecieron seis tratamientos con: 1 mgl -1 , 3 mgl -1 y 5 mgl -1 de ANA y AIB, un control libre de hormonas y cuatro réplicas de cada uno. Se evaluó la supervivencia y enraizamiento de los microtallos, longitud de raíz (mm) y número de raíces por explanto. Se obtuvo supervivencia de hasta 100% con la adición de 3 mgl -1 de AIB al medio de cultivo. Se presentaron diferencias significativas entre el tratamiento control y microtallos sometidos a inmersión en hormonas. Se obtuvo 87,5% de enraizamiento adventicio con 1 mgl -1 de AIB y un 75,0% con 3 mgl -1 de ANA. Se concluye que la presencia de auxinas en el medio de cultivo es indispensable para la formación de raíces in vitro y establece la posibilidad de mantener el potencial rizogénico de la especie en condiciones ex vitro.PALABRAS CLAVE: Ácido 3-indolbutírico, ácido 1-naftalenacético, raíces adventicias, Nothofagus glauca. ABSTRACTNothofagus glauca forms essential associations with problematic species such as Nothofagus alessandrii, Beilschmiedia berteroana and Nothofagus leonii. By enhancing its native environment, N. glauca increases its ecological and scenic value. It is considered a keystone species in certain habitats, and its continued decline or loss may directly affect other species. Ex situ conservation is a priority for the recovery of the species; therefore, tissue culture is, among others, one of the alternative mechanisms for effective propagation and conservation of N. glauca. The aim of this study was to evaluate the independent effect of two auxins, 1-naphthalene acetic acid (NAA) and indole 3-butyric acid (IBA) in vitro rooting of microshoots of N. glauca from successive subcultures on MS medium. Six treatments were established containing 1 mgl -1 , 3 mgl -1 , and 5 mgl -1 of NAA and IBA. Experimental design included a hormone-free control and four replicates of each treatment. We evaluated the survival and rooting of the microshoots, the root length (mm), and the number of roots formed per explant. Survival of microshoots was recorded at 100% when 3 mgl -1 IBA was added to the culture medium. Furthermore, significant differences existed between the control treatment and the microshoots s...

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Extension Del Limite Sur Para Nothofagus Glauca (Phil.) Krasser

Cited by 9 publications

References 0 publications

Population genetic structure, genetic diversity, and natural history of the South American species of Nothofagus subgenus Lophozonia (Nothofagaceae) inferred from nuclear microsatellite data

Population genetic structure, genetic diversity, and natural history of the South American species of Nothofagus subgenus Lophozonia (Nothofagaceae) inferred from nuclear microsatellite data

Composición, Estructura Y Diversidad De Poblaciones De Nothofagus Glauca Ubicadas en La Zona Mediterranea De Chile

Influencia de las auxinas sobre el enraizamiento in vitro de microtallos de Nothofagus glauca (Phil.) Krasser

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