En el capitulo de girasol, los procesos que conducen a la floracion y fructificacion siguen una s... more En el capitulo de girasol, los procesos que conducen a la floracion y fructificacion siguen una secuencia centripeta. Las fluctuaciones ambientales durante estas etapas pueden alterar, con diferente grado de magnitud, la produccion y viabilidad del polen en distintas posiciones del capitulo. El objetivo de este trabajo fue cuantificar durante el periodo de antesis la produccion y viabilidad polinica en distintos sectores de la inflorescencia. Plantas del genotipo comercial Cargil S515 fueron crecidas en condiciones de campo (fecha de siembra: 26/10/98). Durante antesis y en capitulos previamente seleccionados, se colectaron flores de su region periferica, intermedia y central. Para la estimacion de la concentracion polinica se utilizaron tabletas de esporas de Lycopodium sp. El porcentaje de viabilidad del polen se determino mediante fluorescencia de contraste optico. El sector periferico fue el que produjo polen significativamente mas viable y en mayor cantidad comparado con los se...
The objective of this study was to estimate the pollen emission dynamics of the sunflower crop an... more The objective of this study was to estimate the pollen emission dynamics of the sunflower crop and its relationship with some environmental variables such as daily mean temperature (DMT) and precipitation. Two sunflower hybrids (ACA 884 and Cargill 5515) were sown under field conditions at the Facultad de Agronomia, La Pampa on 26/10/98. Meteorological data was obtained from an agrometeorological station located near the field experiment. Soil water content was measured al sowing time and its dynamic registered over time. Capitula population in the crop was measured before first anthesis took place. During the anthesis period the number of disc florets per capilulum was counted in randomly selected plants. To measure the production ot pollen grains per flower, florets still closed were taken from sectors of the capitula located at its periphery, middle and center. DMT controlled the flowering progress of both genotypes according with the maintenance or not of its value over the aver...
El proceso de internacionalizacion universitaria (IU) en la Universidad Nacional de La Pampa (UNL... more El proceso de internacionalizacion universitaria (IU) en la Universidad Nacional de La Pampa (UNLPam) se dio en dos etapas: una inicial, que dio forma a los primeros lineamientos, estrategias y acciones de internacionalizacion, y una segunda en la que, no solo se consolidaron algunas de esas acciones, sino que tambien se propusieron nuevos objetivos que dieron lugar a nuevas politicas institucionales. Estas etapas estan contenidas en los Planes Estrategicos (PE) y Proyecto de Desarrollo Institucional (PDI) 2005-2010 y 2011-2015 respectivamente.
El proceso de internacionalizacion universitaria (IU) en la Universidad Nacional de La Pampa (UNL... more El proceso de internacionalizacion universitaria (IU) en la Universidad Nacional de La Pampa (UNLPam) se dio en dos etapas: una inicial, que dio forma a los primeros lineamientos, estrategias y acciones de internacionalizacion, y una segunda en la que, no solo se consolidaron algunas de esas acciones, sino que tambien se propusieron nuevos objetivos que dieron lugar a nuevas politicas institucionales. Estas etapas estan contenidas en los Planes Estrategicos (PE) y Proyecto de Desarrollo Institucional (PDI) 2005-2010 y 2011-2015 respectivamente.
ABSTRACT The aim of this study was to determine the qualitative and quantitative composition of t... more ABSTRACT The aim of this study was to determine the qualitative and quantitative composition of the airborne pollen of Santa Rosa city, La Pampa (Argentina), and to analyse the seasonal behaviour of the pollen types that have the highest representation in the atmosphere. The city, with temperate climate, is located in a cultivated area that corresponds phytogeographically to a xerophytic forest limiting with grasslands. The pollen sampling was performed using a Hirst-type volumetric spore trap located in the urban centre of the city, 15 m above ground level, from July 2007–June 2009. The annual pollen index was 51,647 pollen grains. The airborne pollen consisted of 73 pollen types, 42 of woody origin represented 66 % of the total and with winter-spring seasonality and 31 were of herbaceous origin, which represented 30 % of the total and with spring-summer seasonality. The composition of the woody airborne pollen reflected the formation of urban vegetation, consisting mainly of exotic taxa from tree species used in urban tree alignment. The most abundant types were as follows: Cupressaceae, Fraxinus, Ulmus, Olea europaea, Styphnolobium japonicum, Myrtaceae, Pinaceae, Platanus, Celtis- Morus and Populus. Native components such as Condalia microphylla were also found, indicating the ‘Espinal’ phytogeographical province that was typical of the area. The most abundant herbaceous airborne pollen types, in descending order, were as follows: Poaceae, Amaranthus-Chenopodiaceae, Urticaceae, Brassicaceae and Asteraceae. The emission sources of these pollen types were weeds that grew spontaneously in parks, waste grounds and flower beds of the city.
... 1 , Bárbara M. Corró Molas 1 , Valeria E. Caramuti 1 & Jaime Bernardos 1 ... En Acrom... more ... 1 , Bárbara M. Corró Molas 1 , Valeria E. Caramuti 1 & Jaime Bernardos 1 ... En Acromyrmex subterraneus subterraneus Forel, Della Lucía (1993) sugiere la existencia de tres subcastas ... o sendero de cosecha: donde se encuentran las hormigas que realizan el corte y transporte ...
En el capitulo de girasol, los procesos que conducen a la floracion y fructificacion siguen una s... more En el capitulo de girasol, los procesos que conducen a la floracion y fructificacion siguen una secuencia centripeta. Las fluctuaciones ambientales durante estas etapas pueden alterar, con diferente grado de magnitud, la produccion y viabilidad del polen en distintas posiciones del capitulo. El objetivo de este trabajo fue cuantificar durante el periodo de antesis la produccion y viabilidad polinica en distintos sectores de la inflorescencia. Plantas del genotipo comercial Cargil S515 fueron crecidas en condiciones de campo (fecha de siembra: 26/10/98). Durante antesis y en capitulos previamente seleccionados, se colectaron flores de su region periferica, intermedia y central. Para la estimacion de la concentracion polinica se utilizaron tabletas de esporas de Lycopodium sp. El porcentaje de viabilidad del polen se determino mediante fluorescencia de contraste optico. El sector periferico fue el que produjo polen significativamente mas viable y en mayor cantidad comparado con los se...
The objective of this study was to estimate the pollen emission dynamics of the sunflower crop an... more The objective of this study was to estimate the pollen emission dynamics of the sunflower crop and its relationship with some environmental variables such as daily mean temperature (DMT) and precipitation. Two sunflower hybrids (ACA 884 and Cargill 5515) were sown under field conditions at the Facultad de Agronomia, La Pampa on 26/10/98. Meteorological data was obtained from an agrometeorological station located near the field experiment. Soil water content was measured al sowing time and its dynamic registered over time. Capitula population in the crop was measured before first anthesis took place. During the anthesis period the number of disc florets per capilulum was counted in randomly selected plants. To measure the production ot pollen grains per flower, florets still closed were taken from sectors of the capitula located at its periphery, middle and center. DMT controlled the flowering progress of both genotypes according with the maintenance or not of its value over the aver...
El proceso de internacionalizacion universitaria (IU) en la Universidad Nacional de La Pampa (UNL... more El proceso de internacionalizacion universitaria (IU) en la Universidad Nacional de La Pampa (UNLPam) se dio en dos etapas: una inicial, que dio forma a los primeros lineamientos, estrategias y acciones de internacionalizacion, y una segunda en la que, no solo se consolidaron algunas de esas acciones, sino que tambien se propusieron nuevos objetivos que dieron lugar a nuevas politicas institucionales. Estas etapas estan contenidas en los Planes Estrategicos (PE) y Proyecto de Desarrollo Institucional (PDI) 2005-2010 y 2011-2015 respectivamente.
El proceso de internacionalizacion universitaria (IU) en la Universidad Nacional de La Pampa (UNL... more El proceso de internacionalizacion universitaria (IU) en la Universidad Nacional de La Pampa (UNLPam) se dio en dos etapas: una inicial, que dio forma a los primeros lineamientos, estrategias y acciones de internacionalizacion, y una segunda en la que, no solo se consolidaron algunas de esas acciones, sino que tambien se propusieron nuevos objetivos que dieron lugar a nuevas politicas institucionales. Estas etapas estan contenidas en los Planes Estrategicos (PE) y Proyecto de Desarrollo Institucional (PDI) 2005-2010 y 2011-2015 respectivamente.
ABSTRACT The aim of this study was to determine the qualitative and quantitative composition of t... more ABSTRACT The aim of this study was to determine the qualitative and quantitative composition of the airborne pollen of Santa Rosa city, La Pampa (Argentina), and to analyse the seasonal behaviour of the pollen types that have the highest representation in the atmosphere. The city, with temperate climate, is located in a cultivated area that corresponds phytogeographically to a xerophytic forest limiting with grasslands. The pollen sampling was performed using a Hirst-type volumetric spore trap located in the urban centre of the city, 15 m above ground level, from July 2007–June 2009. The annual pollen index was 51,647 pollen grains. The airborne pollen consisted of 73 pollen types, 42 of woody origin represented 66 % of the total and with winter-spring seasonality and 31 were of herbaceous origin, which represented 30 % of the total and with spring-summer seasonality. The composition of the woody airborne pollen reflected the formation of urban vegetation, consisting mainly of exotic taxa from tree species used in urban tree alignment. The most abundant types were as follows: Cupressaceae, Fraxinus, Ulmus, Olea europaea, Styphnolobium japonicum, Myrtaceae, Pinaceae, Platanus, Celtis- Morus and Populus. Native components such as Condalia microphylla were also found, indicating the ‘Espinal’ phytogeographical province that was typical of the area. The most abundant herbaceous airborne pollen types, in descending order, were as follows: Poaceae, Amaranthus-Chenopodiaceae, Urticaceae, Brassicaceae and Asteraceae. The emission sources of these pollen types were weeds that grew spontaneously in parks, waste grounds and flower beds of the city.
... 1 , Bárbara M. Corró Molas 1 , Valeria E. Caramuti 1 & Jaime Bernardos 1 ... En Acrom... more ... 1 , Bárbara M. Corró Molas 1 , Valeria E. Caramuti 1 & Jaime Bernardos 1 ... En Acromyrmex subterraneus subterraneus Forel, Della Lucía (1993) sugiere la existencia de tres subcastas ... o sendero de cosecha: donde se encuentran las hormigas que realizan el corte y transporte ...
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