The Experts below are selected from a list of 33 Experts worldwide ranked by ideXlab platform
Burgaz, Ana Rosa - One of the best experts on this subject based on the ideXlab platform.
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Las familias "Baeomycetaceae" e I"Icmadophilaceae" en la Península Ibérica
Ediciones Complutense, 2015Co-Authors: Burgaz, Ana RosaAbstract:The morphological, chemical and geographical data of six species of the Baeomycetaceae (Baeomyces) and Icmadophilaceae (Dibaeis, Icmadophila, Thamnolia) families are reported from the Iberian Peninsula. New references of Baeomyces rufus and Dibaeis Baeomyces are published which are the most frequent and abundant species in the Iberian Peninsula.Se aportan datos morfológicos, químicos y de distribución de seis especies de las familias Baeomycetaceae (Baeomyces) e Icmadophilaceae (Dibaeis, Icmadophila, Thamnolia) presentes en la Península Ibérica. Se publican numerosas nuevas citas de Baeomyces rufus y de Dibaeis Baeomyces, que constituyen las especies más frecuentes y abundantes en la península
Lydia Gustavs - One of the best experts on this subject based on the ideXlab platform.
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Unraveling the Photoprotective Response of Lichenized and Free-Living Green Algae (Trebouxiophyceae, Chlorophyta) to Photochilling Stress
Frontiers Media S.A., 2017Co-Authors: Fátima Míguez, Ulf Schiefelbein, Ulf Karsten, José I. García-plazaola, Lydia GustavsAbstract:Lichens and free-living terrestrial algae are widespread across many habitats and develop successfully in ecosystems where a cold winter limits survival. With the goal of comparing photoprotective responses in free-living and lichenized algae, the physiological responses to chilling and photochilling conditions were studied in three lichens and their isolated algal photobionts together as well as in a fourth free-living algal species. We specifically addressed the following questions: (i) Are there general patterns of acclimation in green algae under chilling and photochilling stresses? (ii) Do free-living algae exhibit a similar pattern of responses as their lichenized counterparts? (iii) Are these responses influenced by the selection pressure of environmental conditions or by the phylogenetic position of each species? To answer these questions, photosynthetic fluorescence measurements as well as pigment and low molecular weight carbohydrate pool analyses were performed under controlled laboratory conditions. In general, photochemical efficiency in all free-living algae decreased with increasing duration of the stress, while the majority of lichens maintained an unchanged photochemical activity. Nevertheless, these patterns cannot be generalized because the alga Trebouxia arboricola and the lichen Ramalina pollinaria (associated with Trebouxia photobionts) both showed a similar decrease in photochemical efficiency. In contrast, in the couple Elliptochloris bilobata-Baeomyces rufus, only the algal partner exhibited a broad physiological performance under stress. This study also highlights the importance of the xanthophyll cycle in response to the studied lichens and algae to photochilling stress, while the accumulation of sugars was not related to cold acclimation, except in the alga E. bilobata. The differences in response patterns detected among species can be mainly explained by their geographic origin, although the phylogenetic position should also be considered, especially in some species
Gustavs Lydia - One of the best experts on this subject based on the ideXlab platform.
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Unraveling the Photoprotective Response of Lichenized and Free-Living Green Algae (Trebouxiophyceae, Chlorophyta) to Photochilling Stress
'Frontiers Media SA', 2017Co-Authors: Míguez Cano Fátima, Schiefelbein Ulf, Karsten Ulf, García Plazaola, José Ignacio, Gustavs LydiaAbstract:Lichens and free-living terrestrial algae are widespread across many habitats and develop successfully in ecosystems where a cold winter limits survival. With the goal of comparing photoprotective responses in free-living and lichenized algae, the physiological responses to chilling and photochilling conditions were studied in three lichens and their isolated algal photobionts together as well as in a fourth free-living algal species. We specifically addressed the following questions: (i) Are there general patterns of acclimation in green algae under chilling and photochilling stresses? (ii) Do free-living algae exhibit a similar pattern of responses as their lichenized counterparts? (iii) Are these responses influenced by the selection pressure of environmental conditions or by the phylogenetic position of each species? To answer these questions, photosynthetic fluorescence measurements as well as pigment and low molecular weight carbohydrate pool analyses were performed under controlled laboratory conditions. In general, photochemical efficiency in all free-living algae decreased with increasing duration of the stress, while the majority of lichens maintained an unchanged photochemical activity. Nevertheless, these patterns cannot be generalized because the alga Trebouxia arboricola and the lichen Ramalina pollinaria (associated with Trebouxia photobionts) both showed a similar decrease in photochemical efficiency. In contrast, in the couple Elliptochloris bilobata-Baeomyces rufus, only the algal partner exhibited a broad physiological performance under stress. This study also highlights the importance of the xanthophyll cycle in response to the studied lichens and algae to photochilling stress, while the accumulation of sugars was not related to cold acclimation, except in the alga E. bilobata. The differences in response patterns detected among species can be mainly explained by their geographic origin, although the phylogenetic position should also be considered, especially in some species.FM received a fellowship for PhD students (2012-2015) from the Government of the Basque Country as well as a mobility grant which allowed the collaboration between University of Basque Country (UPV/EHU) and University of Rostock. LG thanks the Deutsche Forschungsgemeinschaft for financial support (DFG GU 1278/1-1). The work was also supported by the project BFU 2010-15021 and CTM2014-53902-C2-2-P from the MINECO and the European Regional Development Fund ERDF (FEDER), and by the Basque Government (UPV/EHU-GV IT-624-13 and UPV/EHU-GV IT-1018-16)
Rosmarie Honegger - One of the best experts on this subject based on the ideXlab platform.
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morphological and molecular analysis of early stages in the resynthesis of the lichen Baeomyces rufus
Fungal Biology, 2002Co-Authors: Marcella L Trembley, Christoph Ringli, Rosmarie HoneggerAbstract:The symbiotic phenotype of a lichen arises through the interaction and cooperation of two or more genetically unrelated partners. Ultrastructural and molecular methods were used to investigate the changes that take place during early stages of the lichenization process. The resynthesis of prethallus stages of Baeomyces rufus was studied by coculturing under sterile conditions the isolated, axenically grown mycobiont and its green algal photobiont Elliptochloris bilobata. The lichenization process was monitored by SEM. One day after co-culture, symbionts were bound together by a newly secreted mucilage. By day 12, photobiont induced, morphological changes in the mycobiont were visible. Aerial hyphae grew around photobiont cells, showed a high frequency of branching and formed appressoria on the algal wall surface. By day 28, many photobiont cells were completely engulfed by hyphae and soredia-like clusters were observed. These morphological developments resemble lichenized structures formed in the natural lichen. cDNA-AFLP was used to investigate gene expression profiles on day 12 of co-culture. Differential gene expression patterns revealed that few genes were induced, and many fungal and algal genes seemed to be suppressed in the early stages of lichenization.
Fátima Míguez - One of the best experts on this subject based on the ideXlab platform.
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Unraveling the Photoprotective Response of Lichenized and Free-Living Green Algae (Trebouxiophyceae, Chlorophyta) to Photochilling Stress
Frontiers Media S.A., 2017Co-Authors: Fátima Míguez, Ulf Schiefelbein, Ulf Karsten, José I. García-plazaola, Lydia GustavsAbstract:Lichens and free-living terrestrial algae are widespread across many habitats and develop successfully in ecosystems where a cold winter limits survival. With the goal of comparing photoprotective responses in free-living and lichenized algae, the physiological responses to chilling and photochilling conditions were studied in three lichens and their isolated algal photobionts together as well as in a fourth free-living algal species. We specifically addressed the following questions: (i) Are there general patterns of acclimation in green algae under chilling and photochilling stresses? (ii) Do free-living algae exhibit a similar pattern of responses as their lichenized counterparts? (iii) Are these responses influenced by the selection pressure of environmental conditions or by the phylogenetic position of each species? To answer these questions, photosynthetic fluorescence measurements as well as pigment and low molecular weight carbohydrate pool analyses were performed under controlled laboratory conditions. In general, photochemical efficiency in all free-living algae decreased with increasing duration of the stress, while the majority of lichens maintained an unchanged photochemical activity. Nevertheless, these patterns cannot be generalized because the alga Trebouxia arboricola and the lichen Ramalina pollinaria (associated with Trebouxia photobionts) both showed a similar decrease in photochemical efficiency. In contrast, in the couple Elliptochloris bilobata-Baeomyces rufus, only the algal partner exhibited a broad physiological performance under stress. This study also highlights the importance of the xanthophyll cycle in response to the studied lichens and algae to photochilling stress, while the accumulation of sugars was not related to cold acclimation, except in the alga E. bilobata. The differences in response patterns detected among species can be mainly explained by their geographic origin, although the phylogenetic position should also be considered, especially in some species
