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Search Results: 1 - 10 of 400739 matches for " YUSSI M; PALFNER "
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Comunidad ectomicorrícica en una cronosecuencia de Pinus radiata (Pinophyta: Pinaceae) de la zona de transición climática mediterráneo-templada de Chile central
PALACIOS,YUSSI M; PALFNER,G?TZ; HERNáNDEZ,CRISTIáN E;
Revista chilena de historia natural , 2012, DOI: 10.4067/S0716-078X2012000100005
Abstract: in natural forest ecosystems and plantations, most trees live in mutualistic association with mycorrhizal fungi. studies of this association in south america are still scarce, especially when referring to the causes of temporal dynamics of this symbiotic community, despite its importance in countries with a thriving forestry industry like chile. this study evaluates the dynamics of the ectomycorrhizal community of pinus radiata stands of 3, 10 and 20 years of age, identifying and quantifying the most common fungal colonizers of fine roots in each age class. the results confirm that the mycobiont community changes with host tree age but that age classes differ in dominance patterns rather than in species richness, with the three- and ten-year-old tree cohorts forming a group separate from the 20-year-old trees. a total of eleven ectomycorrhizal root morphotypes could be distinguished. four of them which were identified as hebeloma crustuliniforme, inocybe sp., russula sardonia and pinirhiza spinulosa, were the most abundant (77, 29, 78 and 8 % respectively) and were found in more than one root sample whereas the remaining morphotypes accounted for less than 100 (< 7 %) root tips and showed a patchy distribution. inocybe sp. was only found on root tips of three-year-old trees, characterizing as an early-stage mycobiont. h! crustuliniforme appeared as a multi-stage colonizer in all three age classes but was clearly dominant on roots of three- and ten-year-old trees, whereas r! sardonia was mainly found on roots of 20-year-old trees, classifying as a late-stage species together with the unidentified morphotype pinirhiza spinulosa which is reported for the first time from chile. our results suggest that the observed changes in the ectomycorrhizal community are not induced by the site per se, but are rather an effect of the interaction between the trees and their environment.
Comunidad ectomicorrícica en una cronosecuencia de Pinus radiata (Pinophyta: Pinaceae) de la zona de transición climática mediterráneo-templada de Chile central The ectomycorrhizal community in a chronosequence of Pinus radiata (Pinophyta: Pinaceae) of the transitional Mediterranean-temperate climatic zone of central Chile
YUSSI M PALACIOS,G?TZ PALFNER,CRISTIáN E HERNáNDEZ
Revista chilena de historia natural , 2012,
Abstract: En ecosistemas naturales y plantaciones, las coníferas establecen asociaciones mutualistas con una comunidad diversa de hongos micorrícicos. El estudio de este tema en Sudamérica es aún incipiente, y no existen antecedentes sobre la dinámica temporal de esta comunidad, y menos de sus potenciales causas, a pesar de su importancia para un país forestal como Chile. En el presente trabajo se evaluó la dinámica de la comunidad ectomicorrícica, identificando y cuantificando los hongos formadores de esta asociación en raíces finas de Pinus radiata en plantaciones de 3, 10 y 20 a os. Los resultados confirman que la comunidad ectomicorrícica de P. radiata cambia con la edad de los árboles, la cual difiere más bien en el patrón de dominancia que en la riqueza de especies, separándose un primer grupo de árboles de 3 y 10 a os de un segundo grupo de 20 a os. Un total de once morfotipos de micorrizas fueron diferenciados. Cuatro de ellos, identificados como Hebeloma crustuliniforme, Inocybe sp., Russula sardonia y Pinirhiza spinulosa, fueron los más abundantes (77, 29, 78 y 8 % respectivamente), mientras las otras se encontraron colonizando menos de 100 puntas de raíz (< 7 %), mostrando además una distribución en parches. La especie Inocybe sp. fue encontrada exclusivamente en ápices radicales de árboles de tres a os, caracterizándose como micobionte de estado temprano. Hebeloma crustuliniforme, como colonizador de estado múltiple, estuvo presente en raicillas de todas las clases de edad, sin embargo fue dominante en árboles de 3 y 10 a os, mientras R! sardonia, como especie de estado tardío, dominó en los árboles de 20 a os junto con el morfotipo no identificado Pinirhiza spinulosa que fue registrado por primera vez en Chile. Nuestros resultados sugieren que no es el sitio per se el que genera el cambio de la comunidad ectomicorrícica, sino la interacción del bosque con el entorno. In natural forest ecosystems and plantations, most trees live in mutualistic association with mycorrhizal fungi. Studies of this association in South America are still scarce, especially when referring to the causes of temporal dynamics of this symbiotic community, despite its importance in countries with a thriving forestry industry like Chile. This study evaluates the dynamics of the ectomycorrhizal community of Pinus radiata stands of 3, 10 and 20 years of age, identifying and quantifying the most common fungal colonizers of fine roots in each age class. The results confirm that the mycobiont community changes with host tree age but that age classes differ in dominance patterns rather
Optimized Progressive Coding of Stereo Images Using Discrete Wavelet Transform
Torsten Palfner,Alexander Mali,Erika Müller
Journal of Systemics, Cybernetics and Informatics , 2003,
Abstract: In this paper, a compression algorithm is introduced which allows the efficient storage and transmission of stereo images. The coder uses a block-based disparity estimation/ compensation technique to decorrelate the image pair. To code both images progressively, we have adapted the wellknown SPIHT coder to stereo images. The results presented in this paper are better than any other results published so far.
Mycotrophy in Gilliesieae, a threatened and poorly known tribe of Alliaceae from central Chile Micotrofía en Gilliesieae, una tribu amenazada y poco conocida de Alliaceae de Chile central
GUSTAVO A TORRES-MELLADO,INELIA ESCOBAR,GOTZ PALFNER,M. ANGéLICA CASANOVA-KATNY
Revista chilena de historia natural , 2012,
Abstract: The five known genera of Gilliesieae have their diversity center in the Mediterranean zone of central Chile, where many of their habitats are threatened by urban expansion, industrial and agroforestry activities, as well as other anthropogenic impacts. Very little is known about the biology of these particular geophytes, the majority of which currently have either vulnerable or endangered status, mainly due to their dispersed and small populations generally associated to remnants of native vegetation. As mycorrhizal associations are essential for soil resource acquisition and stress mitigation in most plants, our objective was to assess the hitherto unknown mycotrophic status of ten species of Gilliesieae from central Chile by qualitative and quantitative assessment of intraradical fungal structures. All sampled genera (Gethyum, Gilliesia, Miersia, Solaria, Speea) showed regular presence of arbuscular mycorrhiza, while other mycorrhizal or putatively mutualistic associations, like dark septate endophytes, were practically absent. Mycorrhizal colonization of fine roots reached a mean of ca. 45 % across all examined taxa, with highly variable values ranging from 9 % to 82 % in Miersia tenuiseta and Gilliesia curicana, respectively. The high level of mycorrhization indicates that arbuscular mycorrhiza should be considered for conservation strategies of threatened species or biotechnological use in plant propagation. The main future task is the identification of the associated fungal taxa. Los cinco géneros conocidos de Gilliesieae tienen su centro de diversidad en la zona mediterránea de Chile central, donde muchos de sus hábitats están amenazados por la expansión urbana, actividades industriales y agroforestales, así como otros impactos antropogénicos. Se sabe muy poco sobre la biología de estas particulares geófitas, que en la actualidad tienen en su mayoría estatus de vulnerable o en peligro de extinción, debido a sus poblaciones dispersas y pequenas, generalmente asociadas a remanentes de vegetación nativa. Dado que las asociaciones micorrícicas son esenciales para la adquisición de recursos del suelo y para la mitigación de estrés en la mayoría de las plantas, nuestro objetivo fue determinar el estatus micotrófico aún desconocido de diez especies de Gilliesieae de Chile central, mediante análisis cualitativos y cuantitativos de las estructuras fúngicas intrarradicales. Todos los géneros evaluados (Gethyum, Gilliesia, Miersia, Solaria, Speea) mostraron la presencia regular de micorrizas arbusculares, mientras que otras asociaciones micorrícicas o asoci
Primer registro de Russula pectinatoides Peck (Basidiomycota, Russulaceae) para Chile
PALFNER,G?TZ;
Gayana. Botánica , 2011, DOI: 10.4067/S0717-66432011000200025
Abstract: russulapectinatoides (basidiomycota, russulaceae), considered a holarctic species, is reported for the first time from chile. it adds to the list of adventitious russula and lactarius species which form mycorrhizal associations with introduced ornamental and forest trees. a detailed description and an updated key for allochtonous agaricoid russulaceae in chile are provided.
Primer registro de Russula pectinatoides Peck (Basidiomycota, Russulaceae) para Chile First record of Russula pectinatoides Peck (Basidiomycota, Russulaceae) from Chile
G?TZ PALFNER
Gayana. Botanica , 2011,
Abstract: Russulapectinatoides (Basidiomycota, Russulaceae), considered a holarctic species, is reported for the first time from Chile. It adds to the list of adventitious Russula and Lactarius species which form mycorrhizal associations with introduced ornamental and forest trees. A detailed description and an updated key for allochtonous agaricoid Russulaceae in Chile are provided.
Laetisaria fuciformis (Basidiomycota, Corticiaceae), nuevo registro de un parásito fúngico sobre gramíneas en el sur de Chile
Palfner,G?tz; Marticorena,Alicia; Medina,Marcelo;
Gayana. Botánica , 2010, DOI: 10.4067/S0717-66432010000200013
Abstract: a new record of the fungal grass parasite laetisaria fuciformis from southern chile is described and its biology is briefly discussed.
Controlled Rhizogenesis and Mycorrhization of Hazelnut (Corylus avellana L.) Cuttings with Black Truffle (Tuber melanosporum Vitt.)
Santelices,Rómulo; Palfner,G?tz;
Chilean journal of agricultural research , 2010, DOI: 10.4067/S0718-58392010000200003
Abstract: hazelnut (corylus avellana l.) is commonly used as mycorrhizal host for tuber melanosporum vitt. (black truffle). black truffle orchards have been established in and outside its natural distribution area, currently also in chile. hazelnut can be propagated rapidly by cuttings, which, however, may not easily form mycorrhizal symbiosis under laboratory conditions. we successfully inoculated hazelnut cuttings with t. melanosporum and studied the effects of culture conditions, plant material and inoculum age on rhizogenesis and mycorrhization. cuttings from sucker shoots showed the highest rooting rate (88.5%). perlite and vermiculite as substrate increased root length (9.6 cm ). treatment with auxin significantly increased root yield (up to 27 roots per cutting). larger containers increased the mycorrhization rate (33.6%). up to 2 year storage of sporal inoculum did not affect mycorrhization. we conclude that root induction in c. avellana cuttings and mycorrhization with black truffle using up to 2-yr-old inoculum, do not present problems when performed under optimized conditions, allowing fast production of plants for commercial and reforestation purposes.
Laetisaria fuciformis (Basidiomycota, Corticiaceae), nuevo registro de un parásito fúngico sobre gramíneas en el sur de Chile Laetisaria fuciformis (Basidiomycota, Corticiaceae), new record of a fungal grass parasite from southern Chile
G?tz Palfner,Alicia Marticorena,Marcelo Medina
Gayana. Botanica , 2010,
Abstract: A new record of the fungal grass parasite Laetisaria fuciformis from southern Chile is described and its biology is briefly discussed.
Controlled Rhizogenesis and Mycorrhization of Hazelnut (Corylus avellana L.) Cuttings with Black Truffle (Tuber melanosporum Vitt.) Rizogénesis y Micorrización Controlada de Estacas de Avellano Europeo (Corylus avellana L.) con Trufa Negra (Tuber melanosporum Vitt.)
Rómulo Santelices,G?tz Palfner
Chilean Journal of Agricultural Research , 2010,
Abstract: Hazelnut (Corylus avellana L.) is commonly used as mycorrhizal host for Tuber melanosporum Vitt. (black truffle). Black truffle orchards have been established in and outside its natural distribution area, currently also in Chile. Hazelnut can be propagated rapidly by cuttings, which, however, may not easily form mycorrhizal symbiosis under laboratory conditions. We successfully inoculated hazelnut cuttings with T. melanosporum and studied the effects of culture conditions, plant material and inoculum age on rhizogenesis and mycorrhization. Cuttings from sucker shoots showed the highest rooting rate (88.5%). Perlite and vermiculite as substrate increased root length (9.6 cm ). Treatment with auxin significantly increased root yield (up to 27 roots per cutting). Larger containers increased the mycorrhization rate (33.6%). Up to 2 year storage of sporal inoculum did not affect mycorrhization. We conclude that root induction in C. avellana cuttings and mycorrhization with black truffle using up to 2-yr-old inoculum, do not present problems when performed under optimized conditions, allowing fast production of plants for commercial and reforestation purposes. El avellano europeo (Corylus avellana L.) es uno de los simbiontes más comunes utilizados para inocular plantas con Tuber melanosporum Vitt. (trufa negra). Los huertos truferos han sido establecidos tanto dentro como fuera del área de distribución natural de este hongo micorrizógeno, actualmente también en Chile. El avellano europeo puede propagarse rápidamente por estacas. Sin embargo, no es fácil el desarrollo de órganos micorrícicos bajo condiciones de laboratorio. En este estudio se inocularon exitosamente estacas de avellano europeo con T. melanosporum y se estudió el efecto de algunos tratamientos culturales, del material vegetal y tiempo de almacenamiento del inóculo, en el proceso de rizogénesis y micorrización. Las estacas provenientes de chupones tuvieron una mayor capacidad de arraigamiento (88,5%). El uso de perlita y vermiculita como sustrato incrementó la longitud de las raíces (9,6 cm ). Los tratamientos con auxinas aumentaron significativamente la producción de raíces (más de 27 raíces por estaca). Por otra parte, el uso de contenedores más grandes permitió incrementar el porcentaje de micorrización (33,6%) y fue posible almacenar hasta 2 a os el inóculo esporal sin que se afecte la micorrización. Se concluye que es posible la inducción de raíces en estacas de C. avellana y su micorrización con trufa negra utilizando inóculo de hasta 2 a os de almacenamiento, bajo condiciones controladas
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