Publicações

@article{Hippler2018e,

title = {Mechanisms of copper stress alleviation in Citrus trees after metal uptake by leaves or roots},

author = {Franz Walter Rieger Hippler and Guilherme Petená and Rodrigo Marcelli Boaretto and José Antônio Quaggio and Ricardo Antunes Azevedo and Dirceu Mattos-Jr},

url = {https://link.springer.com/article/10.1007/s11356-018-1529-x},

doi = {10.1007/S11356-018-1529-X},

issn = {1614-7499},

year  = {2018},

date = {2018-01-01},

journal = {Environmental Science and Pollution Research 2018 25:13},

volume = {25},

issue = {13},

pages = {13134-13146},

publisher = {Springer},

abstract = {Nutritional disorders caused by copper (Cu) have affected citrus orchards. Since Cu is foliar sprayed as a pesticide to control citrus diseases, this metal accumulates in the soil. Thereby, we evaluated the effects of Cu leaf absorption after spray of different metal sources, as well as roots absorption on growth, nutritional status, and oxidative stress of young sweet orange trees. Two experiments were carried out under greenhouse conditions. The first experiment was set up with varying Cu levels to the soil (nil Cu, 0.5, 2.0, 4.0 and 8.0 g of Cu per plant as CuSO4.5H2O), whereas the second experiment with Cu application via foliar sprays (0.5 and 2.0 g of Cu per plant) and comparing two metal sources (CuSO4.5H2O or Cu(OH)2). Copper was mainly accumulated in roots with soil supply, but an increase of oxidative stress levels was observed in leaves. On the other hand, Cu concentrations were higher in leaves that received foliar sprays, mainly as Cu(OH)2. However, when sulfate was foliar sprayed, plants exhibited more symptoms of injuries in the canopy with decreased chlorophyll contents and increased hydrogen peroxide and lipid peroxidation levels. Copper toxicity was characterized by sap leakage from the trunk and twigs, which is the first report of this specific Cu excess symptom in woody trees. Despite plants with 8.0 g of Cu soil-applied exhibiting the sap leakage, growth of new plant parts was more vigorous with lower oxidative stress levels and injuries compared to those with 4.0 g of Cu soil-applied (without sap leakage). With the highest level of Cu applied via foliar as sulfate, Cu was eliminated by plant roots, increasing the rhizospheric soil metal levels. Despite citrus likely exhibiting different mechanisms to reduce the damages caused by metal toxicity, such as responsive enzymatic antioxidant system, metal accumulation in the roots, and metal exclusion by roots, excess Cu resulted in damages on plant growth and metabolism when the metal was taken up either by roots or leaves.},

keywords = {Atmospheric Protection/Air Quality Control/Air Pollution, Ecotoxicology, Environment, Environmental Chemistry, Environmental Health, general, Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution},

pubstate = {published},

tppubtype = {article}

}

@article{Hippler2018,

title = {Mechanisms of copper stress alleviation in Citrus trees after metal uptake by leaves or roots},

author = {Franz Walter Rieger Hippler and Guilherme Petená and Rodrigo Marcelli Boaretto and José Antônio Quaggio and Ricardo Antunes Azevedo and Dirceu Mattos-Jr},

url = {https://link.springer.com/article/10.1007/s11356-018-1529-x},

doi = {10.1007/S11356-018-1529-X},

issn = {1614-7499},

year  = {2018},

date = {2018-01-01},

journal = {Environmental Science and Pollution Research 2018 25:13},

volume = {25},

issue = {13},

pages = {13134-13146},

publisher = {Springer},

abstract = {Nutritional disorders caused by copper (Cu) have affected citrus orchards. Since Cu is foliar sprayed as a pesticide to control citrus diseases, this metal accumulates in the soil. Thereby, we evaluated the effects of Cu leaf absorption after spray of different metal sources, as well as roots absorption on growth, nutritional status, and oxidative stress of young sweet orange trees. Two experiments were carried out under greenhouse conditions. The first experiment was set up with varying Cu levels to the soil (nil Cu, 0.5, 2.0, 4.0 and 8.0 g of Cu per plant as CuSO4.5H2O), whereas the second experiment with Cu application via foliar sprays (0.5 and 2.0 g of Cu per plant) and comparing two metal sources (CuSO4.5H2O or Cu(OH)2). Copper was mainly accumulated in roots with soil supply, but an increase of oxidative stress levels was observed in leaves. On the other hand, Cu concentrations were higher in leaves that received foliar sprays, mainly as Cu(OH)2. However, when sulfate was foliar sprayed, plants exhibited more symptoms of injuries in the canopy with decreased chlorophyll contents and increased hydrogen peroxide and lipid peroxidation levels. Copper toxicity was characterized by sap leakage from the trunk and twigs, which is the first report of this specific Cu excess symptom in woody trees. Despite plants with 8.0 g of Cu soil-applied exhibiting the sap leakage, growth of new plant parts was more vigorous with lower oxidative stress levels and injuries compared to those with 4.0 g of Cu soil-applied (without sap leakage). With the highest level of Cu applied via foliar as sulfate, Cu was eliminated by plant roots, increasing the rhizospheric soil metal levels. Despite citrus likely exhibiting different mechanisms to reduce the damages caused by metal toxicity, such as responsive enzymatic antioxidant system, metal accumulation in the roots, and metal exclusion by roots, excess Cu resulted in damages on plant growth and metabolism when the metal was taken up either by roots or leaves.},

keywords = {Atmospheric Protection/Air Quality Control/Air Pollution, Ecotoxicology, Environment, Environmental Chemistry, Environmental Health, general, Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution},

pubstate = {published},

tppubtype = {article}

}

@article{Savi2018,

title = {Phaeophleospora vochysiae Savi & Glienke sp. nov. Isolated from Vochysia divergens Found in the Pantanal, Brazil, Produces Bioactive Secondary Metabolites},

author = {Daiani C. Savi and Khaled A. Shaaban and Francielly Maria Wilke Ramos Gos and Larissa V. Ponomareva and Jon S. Thorson and Chirlei Glienke and Jürgen Rohr},

url = {https://www.nature.com/articles/s41598-018-21400-2},

doi = {10.1038/s41598-018-21400-2},

issn = {2045-2322},

year  = {2018},

date = {2018-01-01},

journal = {Scientific Reports 2018 8:1},

volume = {8},

issue = {1},

pages = {1-10},

publisher = {Nature Publishing Group},

abstract = {Microorganisms associated with plants are highly diverse and can produce a large number of secondary metabolites, with antimicrobial, anti-parasitic and cytotoxic activities. We are particularly interested in exploring endophytes from medicinal plants found in the Pantanal, a unique and widely unexplored wetland in Brazil. In a bio-prospecting study, strains LGMF1213 and LGMF1215 were isolated as endophytes from Vochysia divergens, and by morphological and molecular phylogenetic analyses were characterized as Phaeophleospora vochysiae sp. nov. The chemical assessment of this species reveals three major compounds with high biological activity, cercoscosporin (1), isocercosporin (2) and the new compound 3-(sec-butyl)-6-ethyl-4,5-dihydroxy-2-methoxy-6-methylcyclohex-2-enone (3). Besides the isolation of P. vochysiae as endophyte, the production of cercosporin compounds suggest that under specific conditions this species causes leaf spots, and may turn into a pathogen, since leaf spots are commonly caused by species of Cercospora that produce related compounds. In addition, the new compound 3-(sec-butyl)-6-ethyl-4,5-dihydroxy-2-methoxy-6-methylcyclohex-2-enone showed considerable antimicrobial activity and low cytotoxicity, which needs further exploration.},

keywords = {Antibiotics, Environmental Chemistry, only two Phaeophleospora, Plantaginaceae, Polypodiaceae, Proteaceae and Apocynaceae 11-14 So far},

pubstate = {published},

tppubtype = {article}

}