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| Registros recuperados: 11 | |
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| ATALA,CRISTIAN; SCHNEIDER,CARLOS; BRAVO,GABRIEL; QUILODRÁN,MANUEL; VARGAS,REINALDO. |
| Environmental conditions can affect lichen morphology, physiology and chemistry. Some functional traits; like thickness of thallus layers, photosystems condition, and presence of photoprotective and antioxidant compounds are key to colonizing new sites, and can change depending on light and moisture availability. In the present study, we compared the morphology, physiology and chemistry of the native Chilean lichen Pseudocyphellaria flavicans from two Coastal populations (Nahuelbuta and Contulmo, Araucanía district), and one Andean population (Ralco, Bío-Bío district). Ralco is a more closed secondary forest, and can show dryer periods compared to Nahuelbuta and Contulmo. We found differences in thalli anatomy between populations. Ralco individuals had... |
| Tipo: Journal article |
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| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100003 |
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| PEREIRA,GUILLERMO; ALBORNOZ,VERÓNICA; ROMERO,CHRISTIAN; LARA,SEBASTIÁN; SÁNCHEZ-OLATE,MANUEL; RÍOS,DARCY; ATALA,CRISTIAN. |
| ABSTRACT Orchids require symbiotic fungi and/or specific conditions to germinate. Asymbiotic techniques have been shown successful for orchid germination. In Chile, Chloraea include many endemic, and potentially ornamental, terrestrial orchid species. In this study, individuals of Chloraea crispa, C. gavilu and C. virescens were manually autopollinated. The resulting capsules were sterilized and seeds were aseptically obtained. We evaluated asymbiotic germination in: Agar Water (AW), Knudson C (KC), Banana Culture Media (CMB), Tomato Culture Media (CMT), Malmgren Modified (MM), Murashige and Skoog (MS), and MS modified (MS1/2). Seeds were incubated in the dark at 24±1 ºC for 2 weeks. Then they were put in 16/8 h light/dark cycles for 14 weeks. We... |
| Tipo: Journal article |
Palavras-chave: Terrestrial orchids; Endemic species; In vitro germination; Culture media; Orchid propagation; Asymbiotic germination. |
| Ano: 2017 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432017000100131 |
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| ATALA,CRISTIAN; ALFARO,JUAN FELIPE; PARRA,MARÍA JOSÉ; SALDAÑA,ALFREDO. |
| Mosses are poikilohydrous non-vascular plants, usually with some degree of desiccation tolerance. Dendroid mosses have conducting tissues that make them analogous to vascular plants. Functional studies on these mosses, however, are scarce. Dendroligotrichum dendroides is a dendroid moss that occurs in Chile in the understory of temperate forests where it can be exposed to summer drought. We studied desiccation tolerance and rehydration capacity on D. dendroides from two populations with contrasting precipitation. We sampled plants from the northern part of their distribution (Contulmo, Araucanía district; lower precipitation), and from a southern population in Katalapi (Los Lagos district; higher precipitation). We measured relative water content and... |
| Tipo: Journal article |
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| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100003 |
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| ATALA,CRISTIAN; CORDERO,CRISTIAN; GIANOLI,ERNESTO. |
| There is evidence that some climbing plants increase their twining rate after leaf damage, thus avoiding ground herbivores, and that drought limits this induced response. However, it is unknown whether leaf damage and drought affect the search for support, an ecologically relevant process for climbing plants. We evaluated the combined effect of drought and leaf damage on support searching in the twining vine Ipomoeapupurea (Convolvulaceae). Plants were assigned to a combination of three watering treatments (regular watering, moderate drought, and severe drought) and two damage treatments (control and 50% defoliation). We placed a stake at 15 cm from the stem and recorded the time to successful twining (360° turn). We also measured some plant functional... |
| Tipo: Journal article |
Palavras-chave: Support searching; Drought; Leaf damage; Ipomoea purpurea. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200011 |
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| ATALA,CRISTIAN; MUÑOZ-CAPPONI,EDGARDO; PEREIRA,GUILLERMO; NAVARRETE,EDUARDO; OSES,RÓMULO; MOLINA-MONTENEGRO,MARCO. |
| In drought condition, plants increase survival chance by adjusting their functional traits and by biological associations. Mycorrhizae association and artificial watering have been shown to increase plant survival under drought, especially at early developmental stages when plants are more susceptible. In Chile, Pinus radiata is the most important forest species. It is grown mainly in Central Chile, where precipitations are predicted to drop in 40% and change in frequency in the future due to climate change. Rhizopogon luteolus is an ectomycorrhizae usually associated with Pinus species and has been found to increase drought tolerance. We addressed the effect of R. luteolus inoculation on survival and functional traits of P. radiata seedlings exposed to... |
| Tipo: Journal article |
Palavras-chave: Pinus radiata; Rhizopogon luteolus; Climate change; Ectomycorrhizae; Drought tolerance. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000200009 |
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| ATALA,CRISTIAN; QUILODRÁN,MANUEL; MOLINA-MONTENEGRO,MARCO A.. |
| Twining in some Convolvulaceae can be induced by leaf damage and jasmonic acid application. This induced response is believed to reduce the likelihood of future leaf damage and it is limited by drought. This response has been detected in the Convolvulaceae family using artificial damage. The mechanisms and ecological implications of this response are still unknown. In this study was tested if the induced twining requires a threshold level and if it is induced by volatiles and/or by snail damage. Three separated greenhouse experiments were conducted in order to test the induced twining in Ipomoea purpurea (Convolvulaceae) by applying different levels of artificial damage (0, 1, 5, 10 perforations to the leaves), volatiles (ground leaves) and natural damage... |
| Tipo: Journal article |
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| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000200001 |
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| CANALS,MAURICIO; ATALA,CRISTIAN; OLIVARES,RICARDO; NOVOA,F. FERNANDO; ROSENMANN,MARIO. |
| La vía aérea ha sido propuesta como modelo de diseño óptimo desde una perspectiva física. Su diseño se ha asociado con un adecuado flujo de gases a los alvéolos, una mínima producción de entropía y un mínimo costo en materia y energía. Se ha propuesto un decrecimiento exponencial del diámetro de los bronquios (dG) en función de la generación: dG = do·2-G/3, asociado a una mínima producción de entropía. También se ha propuesto un modelo de renormalización: dG = An·G-u donde u es un exponente y An una función que introduce desviaciones periódicas en la escala, es decir más de una escala, evitando la propagación distal de errores aleatorios en el calibre de un bronquio. Sin embargo, este último resultado podría ser consecuencia en árboles asimétricos de la... |
| Tipo: Journal article |
Palavras-chave: Optimización; Bronquios; Asimetría; Modelos. |
| Ano: 2002 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000200001 |
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| PARRA,MARÍA JOSÉ; RODRÍGUEZ,ROBERTO; CAVIERES,LOHENGRIN; MUÑOZ-TAPIA,LAUREANA; ATALA,CRISTIAN. |
| Chilean vegetation has been described based on dominant trees and shrubs, giving little attention to less conspicuous plants such as pteridophytes sensu lato (ferns and lycophytes). These plants have different ecological demands and reproductive strategies than woody plants and are excellent tools to recognize vegetation zones. In the present study we analyze the distributional patterns of the 124 pteridophyte taxa occurring in continental Chile, regarding species richness and habitat preferences distribution. Using Jaccard’s similarity index and grouping analysis, we obtained 5 pteridophyte zones that are significantly different from each other. Species richness distribution showed unimodal pattern with latitude, increasing from 17º S toward... |
| Tipo: Journal article |
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| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432015000100008 |
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| ATALA,CRISTIAN; MOYA-URRUTIA,VICTORIA. |
| The "murtilla" (Ugni molinae Turcz., Myrtaceae), present in Contulmo Natural Monument (Araucanía Region, Chile), is affected by witches'broom disease, caused by the presence of a phytoplasma in the sieve tubes of the phloem. This phytoplasma affects plants morphoanatomically, producing evident symptoms. Infected branches show reddening of leaves and general dwarfism. In the present study, we compared morphoanatomically and physiologically branches (modules) of murtilla with and without symptoms of witches'broom disease. This was done in order to quantitatively evaluate the actual effect of the infection on adult plants. We cut branches of similar age, with and without symptoms, where we measured fluorescence, chlorophyll content, specific leaf area, stem... |
| Tipo: Journal article |
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| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432014000100005 |
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| Registros recuperados: 11 | |
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