5 research outputs found
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Arctic algae genomes libraries
This library provides taxonomic, biogeographic, protein targeting and evolutionary origin information inferred for four species of photosynthetic nano-flagellate isolated from the Arctic: the cryptomonad CCMP2293; the haptophyte CCMP2436; the chrysophyte CCMP2298; and the pelagophyte CCMP2097, isolated from Baffin Island in summer 1998. Comparative information is also provided for other cryptomonad, haptophyte, PESC clade and pelagophyte species, using information from published genomes and MMETSP transcriptome datasets
Suppression of reactive oxygen species accumulation in chloroplasts prevents leaf damage but not growth arrest in salt-stressed tobacco plants
Crop yield reduction due to salinity is a growing agronomical concern in many regions.
Increased production of reactive oxygen species (ROS) in plant cells accompanies many
abiotic stresses including salinity, acting as toxic and signaling molecules during plant
stress responses. While ROS are generated in various cellular compartments, chloroplasts
represent a main source in the light, and plastid ROS synthesis and/or elimination have
been manipulated to improve stress tolerance. Transgenic tobacco plants expressing a
plastid-targeted cyanobacterial flavodoxin, a flavoprotein that prevents ROS accumulation
specifically in chloroplasts, displayed increased tolerance to many environmental stresses,
including drought, excess irradiation, extreme temperatures and iron starvation. Surprisingly, flavodoxin expression failed to protect transgenic plants against NaCl toxicity. However, when high salt was directly applied to leaf discs, flavodoxin did increase tolerance, as
reflected by preservation of chlorophylls, carotenoids and photosynthetic activities. Flavodoxin decreased salt-dependent ROS accumulation in leaf tissue from discs and whole
plants, but this decline did not improve tolerance at the whole plant level. NaCl accumulation
in roots, as well as increased osmotic pressure and salt-induced root damage, were not prevented by flavodoxin expression. The results indicate that ROS formed in chloroplasts have
a marginal effect on plant responses during salt stress, and that sensitive targets are present in roots which are not protected by flavodoxin.Para citar este articulo: Lodeyro AF, GirĂł M, Poli HO, Bettucci G, Cortadi A, Ferri AM, et al. (2016) Suppression of Reactive Oxygen Species Accumulation in Chloroplasts Prevents Leaf Damage but Not Growth Arrest in Salt-Stressed Tobacco Plants. PLoS ONE 11(7): e0159588. doi:10.1371/journal.pone.0159588Fil: Lodeyro, Anabella F. Universidad Nacional de Rosario. Facultad de Ciencias BioquĂmicas y FarmacĂ©uticas. Instituto de BiologĂa Molecular y Celular de Rosario (IBR -CONICET); Argentina.Fil: GirĂł, Mariana. Universidad Nacional de Rosario. Facultad de Ciencias BioquĂmicas y FarmacĂ©uticas. Instituto de BiologĂa Molecular y Celular de Rosario (IBR -CONICET); Argentina.Fil: Poli, Hugo O. Universidad Nacional de Rosario. Facultad de Ciencias BioquĂmicas y FarmacĂ©uticas. Instituto de BiologĂa Molecular y Celular de Rosario (IBR -CONICET); Argentina.Fil: Bettucci, Gabriel. Universidad Nacional de Rosario. Facultad de Ciencias BioquĂmicas y FarmacĂ©uticas. Departamento de Ciencias BiolĂłgicas; Argentina.Fil: Cortadi, Adriana. Universidad Nacional de Rosario. Facultad de Ciencias BioquĂmicas y FarmacĂ©uticas. Departamento de Ciencias BiolĂłgicas; Argentina.Fil: Ferri, Alejandro M. Universidad Nacional de Rosario. Facultad de Ciencias BioquĂmicas y FarmacĂ©uticas. Departamento de QuĂmica AnalĂtica; Argentina.Fil: Carrillo, NĂ©stor. Universidad Nacional de Rosario. Facultad de Ciencias BioquĂmicas y FarmacĂ©uticas. Instituto de BiologĂa Molecular y Celular de Rosario (IBR -CONICET); Argentina
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Community-Level Responses to Iron Availability in Open Ocean Plankton Ecosystems
Predicting responses of plankton to variations in essential nutrients is hampered by limited in situ measurements, a poor understanding of community composition, and the lack of reference gene catalogs for key taxa. Iron is a key driver of plankton dynamics and, therefore, of global biogeochemical cycles and climate. To assess the impact of iron availability on plankton communities, we explored the comprehensive bio-oceanographic and bio-omics data sets from Tara Oceans in the context of the iron products from two state-of-the-art global scale biogeochemical models. We obtained novel information about adaptation and acclimation toward iron in a range of phytoplankton, including picocyanobacteria and diatoms, and identified whole subcommunities covarying with iron. Many of the observed global patterns were recapitulated in the Marquesas archipelago, where frequent plankton blooms are believed to be caused by natural iron fertilization, although they are not captured in large-scale biogeochemical models. This work provides a proof of concept that integrative analyses, spanning from genes to ecosystems and viruses to zooplankton, can disentangle the complexity of plankton communities and can lead to more accurate formulations of resource bioavailability in biogeochemical models, thus improving our understanding of plankton resilience in a changing environment