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Roberto L Benecharnold - One of the best experts on this subject based on the ideXlab platform.

  • changes in the light sensitivity of buried Polygonum Aviculare seeds in relation to cold induced dormancy loss development of a predictive model
    New Phytologist, 2005
    Co-Authors: Diego Batlla, Roberto L Benecharnold
    Abstract:

    The effect of cold (stratification) temperature on changes in the sensitivity of Polygonum Aviculare seeds to light was investigated. Seeds buried in pots were stored under stratification temperatures (1.6, 7 and 12 degrees C) for 137 d. Seeds exhumed at regular intervals during storage were exposed to different light treatments. Germination responses obtained for seeds exposed to different light treatments and stratification temperatures were used to develop a model to predict the sensitivity of buried seeds to light. Seed sensitivity to light increased as dormancy loss progressed, showing the successive acquisition of low-fluence responses (LFR), very low-fluence responses (VLFR), and the loss of the light requirement for germination for a fraction of the seed population. These changes were inversely correlated to stratification temperature, allowing the use of a thermal time index to relate observed changes in seed light sensitivity to stratification temperature. The rate of increase in sensitivity of P. Aviculare seeds to light during stratification is inversely correlated to soil temperature, and these changes in light sensitivity could be predicted in relation to temperature using thermal-time models.

  • changes in the light sensitivity of buried Polygonum Aviculare seeds in relation to cold induced dormancy loss development of a predictive model
    New Phytologist, 2004
    Co-Authors: Diego Batlla, Roberto L Benecharnold
    Abstract:

    Summary • The effect of cold (stratification) temperature on changes in the sensitivity of Polygonum Aviculare seeds to light was investigated. • Seeds buried in pots were stored under stratification temperatures (1.6, 7 and 12°C) for 137 d. Seeds exhumed at regular intervals during storage were exposed to different light treatments. Germination responses obtained for seeds exposed to different light treatments and stratification temperatures were used to develop a model to predict the sensitivity of buried seeds to light. • Seed sensitivity to light increased as dormancy loss progressed, showing the successive acquisition of low-fluence responses (LFR), very low-fluence responses (VLFR), and the loss of the light requirement for germination for a fraction of the seed population. These changes were inversely correlated to stratification temperature, allowing the use of a thermal time index to relate observed changes in seed light sensitivity to stratification temperature. • The rate of increase in sensitivity of P. Aviculare seeds to light during stratification is inversely correlated to soil temperature, and these changes in light sensitivity could be predicted in relation to temperature using thermal-time models.

Diego Batlla - One of the best experts on this subject based on the ideXlab platform.

  • changes in the light sensitivity of buried Polygonum Aviculare seeds in relation to cold induced dormancy loss development of a predictive model
    New Phytologist, 2005
    Co-Authors: Diego Batlla, Roberto L Benecharnold
    Abstract:

    The effect of cold (stratification) temperature on changes in the sensitivity of Polygonum Aviculare seeds to light was investigated. Seeds buried in pots were stored under stratification temperatures (1.6, 7 and 12 degrees C) for 137 d. Seeds exhumed at regular intervals during storage were exposed to different light treatments. Germination responses obtained for seeds exposed to different light treatments and stratification temperatures were used to develop a model to predict the sensitivity of buried seeds to light. Seed sensitivity to light increased as dormancy loss progressed, showing the successive acquisition of low-fluence responses (LFR), very low-fluence responses (VLFR), and the loss of the light requirement for germination for a fraction of the seed population. These changes were inversely correlated to stratification temperature, allowing the use of a thermal time index to relate observed changes in seed light sensitivity to stratification temperature. The rate of increase in sensitivity of P. Aviculare seeds to light during stratification is inversely correlated to soil temperature, and these changes in light sensitivity could be predicted in relation to temperature using thermal-time models.

  • changes in the light sensitivity of buried Polygonum Aviculare seeds in relation to cold induced dormancy loss development of a predictive model
    New Phytologist, 2004
    Co-Authors: Diego Batlla, Roberto L Benecharnold
    Abstract:

    Summary • The effect of cold (stratification) temperature on changes in the sensitivity of Polygonum Aviculare seeds to light was investigated. • Seeds buried in pots were stored under stratification temperatures (1.6, 7 and 12°C) for 137 d. Seeds exhumed at regular intervals during storage were exposed to different light treatments. Germination responses obtained for seeds exposed to different light treatments and stratification temperatures were used to develop a model to predict the sensitivity of buried seeds to light. • Seed sensitivity to light increased as dormancy loss progressed, showing the successive acquisition of low-fluence responses (LFR), very low-fluence responses (VLFR), and the loss of the light requirement for germination for a fraction of the seed population. These changes were inversely correlated to stratification temperature, allowing the use of a thermal time index to relate observed changes in seed light sensitivity to stratification temperature. • The rate of increase in sensitivity of P. Aviculare seeds to light during stratification is inversely correlated to soil temperature, and these changes in light sensitivity could be predicted in relation to temperature using thermal-time models.

Dora Melucci - One of the best experts on this subject based on the ideXlab platform.

  • heavy metals bioindication potential of the common weeds senecio vulgaris l Polygonum Aviculare l and poa annua l
    Molecules, 2019
    Co-Authors: Mirko Salinitro, Sonia Casolari, Francesco De Laurentiis, Alessandro Zappi, Annalisa Tassoni, Dora Melucci
    Abstract:

    In recent years, heavy metals (HMs) levels in soil and vegetation have increased considerably due to traffic pollution. These pollutants can be taken up from the soil through the root system. The ability of plants to accumulate HMs into their tissues can therefore be used to monitor soil pollution. The aim of this study was to test the ruderal species Senecio vulgaris L., Polygonum Aviculare L., and Poa annua L., as possible candidates for biomonitoring Cu, Zn, Cd, Cr, Ni and Pb in multiple environments. The soils analyzed in this work came from three different environments (urban, woodland, and ultramafic), and therefore deeply differed for their metal content, texture, pH, and organic matter (OM) content. All urban soils were characterized by high OM content and presence of anthropogenic metals like Pb, Zn, Cd, and Cu. Woodland soils were sandy and characterized by low metal content and low OM content, and ultramafic soils had high Ni and Cr content. This soil variability affected the bioindication properties of the three studied species, leading to the exclusion of most metals (Zn, Cu, Cr, Cd, and Pb) and one species (P. Aviculare) due to the lack of linear relations between metal in soil and metal in plants. Senecio vulgaris and Poa annua, conversely, appeared to be good indicators of Ni in all the soils tested. A high linear correlation between total Ni in soil and Ni concentration in P. annua shoots (R2 = 0.78) was found and similar results were achieved for S. vulgaris (R2 = 0.88).

Mirko Salinitro - One of the best experts on this subject based on the ideXlab platform.

  • heavy metals bioindication potential of the common weeds senecio vulgaris l Polygonum Aviculare l and poa annua l
    Molecules, 2019
    Co-Authors: Mirko Salinitro, Sonia Casolari, Francesco De Laurentiis, Alessandro Zappi, Annalisa Tassoni, Dora Melucci
    Abstract:

    In recent years, heavy metals (HMs) levels in soil and vegetation have increased considerably due to traffic pollution. These pollutants can be taken up from the soil through the root system. The ability of plants to accumulate HMs into their tissues can therefore be used to monitor soil pollution. The aim of this study was to test the ruderal species Senecio vulgaris L., Polygonum Aviculare L., and Poa annua L., as possible candidates for biomonitoring Cu, Zn, Cd, Cr, Ni and Pb in multiple environments. The soils analyzed in this work came from three different environments (urban, woodland, and ultramafic), and therefore deeply differed for their metal content, texture, pH, and organic matter (OM) content. All urban soils were characterized by high OM content and presence of anthropogenic metals like Pb, Zn, Cd, and Cu. Woodland soils were sandy and characterized by low metal content and low OM content, and ultramafic soils had high Ni and Cr content. This soil variability affected the bioindication properties of the three studied species, leading to the exclusion of most metals (Zn, Cu, Cr, Cd, and Pb) and one species (P. Aviculare) due to the lack of linear relations between metal in soil and metal in plants. Senecio vulgaris and Poa annua, conversely, appeared to be good indicators of Ni in all the soils tested. A high linear correlation between total Ni in soil and Ni concentration in P. annua shoots (R2 = 0.78) was found and similar results were achieved for S. vulgaris (R2 = 0.88).

Barros José - One of the best experts on this subject based on the ideXlab platform.

  • Controlo de infestantes monocotiledóneas em pós-emergência na cultura do trigo em sementeira directa. Ensaio Topik
    2005
    Co-Authors: Barros José, Fernandes João
    Abstract:

    No ano agrícola de 2004/2005, realizou-se um ensaio cujo objectivo foi estudar o efeito de doses inferiores às recomendadas de clodinafope + cloquintocete (Topik) no controlo de infestantes monocotiledóneas em pós-emergência e, na produção de trigo de Inverno em sementeira directa. Na área de ensaio onde se aplicaram os herbicidas, predominavam claramente as monocotiledóneas Lolium rigidum G. (Azevém anual) e a Avena sterilis L. Outra monocotiledónea que estava presente mas que não foi contabilizada, era o Bromus diandrus R. As dicotiledóneas mais representativas eram as seguintes: Chrysanthemum segetum L. (pampilho-das-searas); Echium plantagineum L. (soagem); Polygonum Aviculare L. (sempre – noiva); Raphanus raphanistrum L. (Saramago); Rumex conglomeratus M. (labaça-ordinária); Chamaemelum mixtum L. (margaça); Silene nocturna L. (cabacinha); Calendula arvensis L. (erva-vaqueira) e Stellaria media L. (morugem-branca). Paralelamente, realizou-se outro ensaio onde se estudou o efeito de diversos tratamentos, no controlo das monocotiledóneas. Os ensaios realizaram-se numa herdade privada do Concelho de Évora (Herdade do Louseiro), que dista aproximadamente 10 km desta cidade

  • Controlo de infestantes mono e dicotiledóneas em pós-emergência na cultura do trigo em sementeira directa. Ensaios: Atlantis e Dopler
    2005
    Co-Authors: Barros José, Duarte Vanessa
    Abstract:

    No ano agrícola de 2004/2005, realizaram-se ensaios cujo objectivo foi o de estudar o efeito de doses inferiores às recomendadas de mesosulfurão-metilo & iodosulfurão-metilo & mefenepir-dietilo (Atlantis) no controlo de infestantes mono e dicotiledóneas e diclofope-metilo + fenoxaprope-p-etilo + mefenepir-dietilo (Dopler) no controlo de infestantes monocotiledóneas (Avena sterilis L. e Lolium rigidum G.) em pós-emergência e, na produção de trigo de Inverno em sementeira directa. Na área de ensaio onde se aplicaram os herbicidas, predominavam claramente as monocotiledóneas Lolium rigidum G. (erva-febra) e a Avena sterilis L (balanco-maior). Outra monocotiledónea que estava presente mas que não foi contabilizada, era o Bromus diandrus R (Bromus). As dicotiledóneas mais representativas eram as seguintes: Chrysanthemum segetum L. (pampilho-das-searas); Echium plantagineum L. (soagem); Polygonum Aviculare L. (sempre – noiva); Raphanus raphanistrum L. (Saramago); Rumex conglomeratus M. (labaça-ordinária); Chamaemelum mixtum L. (margaça); Silene nocturna L. (cabacinha); Calendula arvensis L. (erva-vaqueira) e Stellaria media L. (morugem-branca). Os ensaios realizaram-se numa herdade privada do Concelho de Évora (Herdade do Louseiro), que dista aproximadamente 10 km desta cidade