ASPECTOS CUANTITATIVOS DE LA FAUNA PARASITARIA DE LAS CACHARAS PSEUDOPLATYSTOMA FASCIATUM Y P. TIGRINUM (SILURIFORMES: PIMELODIDAE) DEL RÍO JAMARI, ARIQUEMES, RONDÔNIA, BRASIL

Pseudoplatystoma (Bleeker, 1862) species are of commercial importance in the region of Rondônia, however studies with the species are scarce, so the objective of the research was to carry out a diagnosis of the composition and structure of the parasite communities of Pseudoplatystoma fasciatum (Linnaeus, 1766) and P. tigrinum (Valenciennes, 1840) of the river basin Jamari, Ariquemes - RO, Brazil. During the period from November / 2016 to February / 2018, 50 specimens of P. tigrinum and 51 specimens of P. fasciatum were collected. Of the total sampled fish, 45 specimens of P. tigrinum and 51 specimens P. fasciatum were parasitized by at least one species of parasite presenting a prevalence level of 90% and 100%, respectively. In the parasitic infrapopulations of P. tigrinum, the groups with the highest prevalence rates were nematodes, with larvae being the largest representative of the group, followed by monogenean Vancleaveus ciccinus Kritsky, Thatcher e Boeger, 1986 and for P. fasciatum the parasite helminths that presented the highest prevalence level were the Cestoda groups: Megathylacus sp. Woodland, 1934; Harriscolex sp. Rego, 1987; Monticellia sp. La Rue, 1911; Nominoscolex sp. Woodland, 1934; Nematoda: larvae; Eustrongylides sp. Jägerskiöld, 1909; Cucullanus sp. Müller, 1777; Contracaecum sp. Railliet Henry, 1912 and Monogenea: Vancleaveus ciccinus One species showed a negative correlation between total length and average abundance for P. tigrinum, while P. fasciatum correlation was positive for three species. The comparison of abundance averages by sex for P. tigrinum showed no significant difference between groups, for P. fasciatum a significant difference was observed among the individuals parasitized by Peltidocotyle sp., Monticellia sp., Nominoscolex sp. where females showed higher average abundance in relation to males

Confirmation of spring viremia of carp virus in wild common carp (Cyprinus carpio L.) in Mexico

Abstract del trabajo exposición en conferencia eafp-2019This study confirms the presence of spring viremia of carp virus (SVCV) in wild common carp (Cyprinus carpio L) in central Mexico. Fish exhibited lesions suggestive of SVC, and samples were analyzed by cell culture, molecular techniques, gene sequencing, and electronic microscopy, resulting in the isolation and identification of SVCV.FONDAP 15110027 and FONDECYT 1150695 from CONICYT, Chile. Research Projects 4489/2018/CI from SIEA‐UAEM and Ciencia Básica CONACYT México: reference 287537

Cytochrome respiration pathway and sulphur metabolism sustain stress tolerance to low temperature in the Antarctic species Colobanthus quitensis

Understandingthe strategies employed by plant species that live in extreme environments offersthe possibility to discover stress tolerance mechanisms. We studied thephysiological, antioxidant and metabolic responses to three temperatureconditions (4, 15, and 23°C) of Colobanthusquitensis (CQ), one of the only two native vascular species in Antarctica.We also employed Dianthus chinensis(DC), to assess the effects of the treatments in a non-Antarctic species fromthe same family.-Usingfused LASSO modelling, we associated physiological and biochemical antioxidant responseswith primary metabolism. This approach allowed us to highlight the metabolicpathways driving the response specific to CQ.-Lowtemperature imposed dramatic reductions in photosynthesis (up to 88%) but notin respiration (sustaining rates of 3.0?4.2 µmol CO2 m-2s‑1) in CQ, and no change in the physiological stress parameters wasfound. Its notable antioxidant capacity and mitochondrial cytochromerespiratory activity (20 and two times higher than DC, respectively), whichensure ATP production even at low temperature, was significantly associatedwith sulphur-containing metabolites and polyamines.-Ourfindings potentially open new biotechnological opportunities regarding the roleofantioxidant compounds and respiratory mechanisms associated with sulphurmetabolism instress tolerance strategies to low temperature.Fil: Clemente-Moreno, María J.. Departamento de Biología; EspañaFil: Omranian, Nooshin. Max Planck Institute Of Molecular Plant Physiology; AlemaniaFil: Sáez, Patricia. Universidad de Concepción; ChileFil: Figueroa, Carlos Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Agrobiotecnología del Litoral. Universidad Nacional del Litoral. Instituto de Agrobiotecnología del Litoral; ArgentinaFil: Del-Saz, Néstor. Universidad de Concepción; ChileFil: Elso, Mhartyn. Universidad de Concepción; ChileFil: Poblete, Leticia. Universidad de Concepción; ChileFil: Orf, Isabel. Ben Gurion University of the Negev; IsraelFil: Cuadros-Inostroza, Alvaro. Metasysx Gmbh; AlemaniaFil: Cavieres, Lohengrin. Universidad de Concepción; ChileFil: Bravo, León. Universidad de La Frontera; ChileFil: Fernie, Alisdair. Max Planck Institute Of Molecular Plant Physiology; AlemaniaFil: Ribas-Carbó, Miquel. Departamento de Biología; EspañaFil: Flexas, Jaume. Departamento de Biología; EspañaFil: Nikoloski, Zoran. Max Planck Institute Of Molecular Plant Physiology; AlemaniaFil: Brotman, Yariv. Ben Gurion University of the Negev; IsraelFil: Gago, Jorge. Departamento de Biología; Españ

Low-temperature tolerance of the Antarctic species Deschampsia antarctica: A complex metabolic response associated with nutrient remobilization

The species Deschampsia antarctica (DA) is one of the only two native vascular species that live in Antarctica. We performed ecophysiological, biochemical, and metabolomic studies to investigate the responses of DA to low temperature. In parallel, we assessed the responses in a non-Antarctic reference species (Triticum aestivum [TA]) from the same family (Poaceae). At low temperature (4°C), both species showed lower photosynthetic rates (reductions were 70% and 80% for DA and TA, respectively) and symptoms of oxidative stress but opposite responses of antioxidant enzymes (peroxidases and catalase). We employed fused least absolute shrinkage and selection operator statistical modelling to associate the species-dependent physiological and antioxidant responses to primary metabolism. Model results for DA indicated associations with osmoprotection, cell wall remodelling, membrane stabilization, and antioxidant secondary metabolism (synthesis of flavonols and phenylpropanoids), coordinated with nutrient mobilization from source to sink tissues (confirmed by elemental analysis), which were not observed in TA. The metabolic behaviour of DA, with significant changes in particular metabolites, was compared with a newly compiled multispecies dataset showing a general accumulation of metabolites in response to low temperatures. Altogether, the responses displayed by DA suggest a compromise between catabolism and maintenance of leaf functionality.Fil: Clemente Moreno, María José. Instituto de Agroecología y Economía del Agua; EspañaFil: Omranian, Nooshin. Max Planck Institute Of Molecular Plant Physiology; AlemaniaFil: Sáez, Patricia L.. Universidad de Concepción; ChileFil: Figueroa, Carlos Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Agrobiotecnología del Litoral. Universidad Nacional del Litoral. Instituto de Agrobiotecnología del Litoral; ArgentinaFil: Del Saz, Néstor. Universidad de Concepción; ChileFil: Elso, Mhartyn. Universidad de Concepción; ChileFil: Poblete, Leticia. Universidad de Concepción; ChileFil: Orf, Isabel. Ben Gurion University of the Negev; IsraelFil: Cuadros Inostroza, Alvaro. No especifíca;Fil: Cavieres, Lohengrin A.. Universidad de Concepción; ChileFil: Bravo, León. Universidad de Concepción; ChileFil: Fernie, Alisdair R.. Max Planck Institute Of Molecular Plant Physiology; AlemaniaFil: Ribas Carbó, Miquel. Instituto de Agroecología y Economía del Agua; EspañaFil: Flexas, Jaume. Instituto de Agroecología y Economía del Agua; EspañaFil: Nikoloski, Zoran. Max Planck Institute Of Molecular Plant Physiology; AlemaniaFil: Brotman, Yariv. Ben Gurion University of the Negev; IsraelFil: Gago, Jorge. Instituto de Agroecología y Economía del Agua; Españ