Primavera do Leste, Brazil
Primavera do Leste, Brazil

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De Souza Freire I.,University of Brasilia | Miranda-Vilela A.L.,University of Brasilia | Barbosa L.C.P.,University of Brasilia | Martins E.S.,Instituto Mato Grossense do Algodao IMAmt | Grisolia C.K.,University of Brasilia
Toxins | Year: 2014

The insecticidal properties of Cry-endotoxins from Bacillus thuringiensis (Bt) have long been used as spore-crystals in commercial spray formulations for insect control. Recently, some Bt-endotoxin genes have been cloned in many different plants. Toxicological evaluations of three spore-crystal endotoxins, BtCry1Ia, BtCry10Aa and BtCry1Ba6 from B. thuringiensis, were carried out on mice to understand their adverse effects on hematological systems and on genetic material. These three spore-crystals have shown toxic activity to the boll weevil, which is one of the most aggressive pests of the cotton crop. Cry1Ia, Cry10Aa and Cry1Ba6 did not increase the micronucleus frequency in the peripheral erythrocytes of mice and did not cause changes in the frequency of polychromatic erythrocytes. However, some hematologic disburbances were observed, specifically related to Cry1Ia and Cry1Ba6, respectively, for the erythroid and lymphoid lineage. Thus, although the profile of such adverse side effects can be related to their high level of exposure, which is not commonly found in the environment, results showed that these Bt spore-crystals were not harmless to mice, indicating that each spore-crystal endotoxin presents a characteristic profile of toxicity and might be investigated individually. © 2014 by the authors; licensee MDPI, Basel, Switzerland.

da Silva A.K.F.,Federal University of Rio de Janeiro | Romanel E.,Federal University of Rio de Janeiro | Romanel E.,University of Sao Paulo | Silva T.F.,Federal University of Rio de Janeiro | And 6 more authors.
Archives of Virology | Year: 2015

Since 2006, Brazilian cotton (Gossypium hirsutum) crops planted with cultivars that are resistant to cotton blue disease have developed a new disease termed “atypical” cotton blue disease or atypical vein mosaic disease. Here, we describe the complete genomes of two virus isolates associated with this disease. The new virus isolates, called CLRDV-Acr3 and CLRDV-IMA2, were found to have a high degree of nucleotide and amino acid sequence similarity to previously described isolates of cotton leafroll dwarf virus, the causal agent of cotton blue disease. However, their P0 proteins were 86.1 % identical. These results show that this new disease is caused by a new CLRDV genotype that seems to have acquired the ability to overcome cotton blue disease resistance. © 2015, Springer-Verlag Wien.

Galbieri R.,Instituto Mato Grossense do Algodao IMAmt | Cia E.,Instituto Agronomico Of Campinas Iac | Fuzatto M.G.,Instituto Agronomico Of Campinas Iac | Franzon R.C.,Instituto Mato Grossense do Algodao IMAmt | And 2 more authors.
Tropical Plant Pathology | Year: 2010

Greenhouse controlled experiments and field trials, under natural infestation, were carried out in order to verify the transmissibility and the reaction of cotton genotypes to a presumed new virus disease affecting cotton crops, mainly in Mato Grosso State, Brazil. The tests revealed that the disease, which is being tentatively named "atypical vein mosaic", has as a vector the cotton aphid (Aphys gossypii Glover). Cotton genotypes, comprising cultivars and advanced lineages available in Brazil, differed considerably with respect to reaction to the pathogen; they were put in graded groups of resistance/susceptibility. The lack of positive correlation between the genotypes' response to this disease, and to the vein mosaic viruses ("blue disease") currently present in this region, indicated that different pathogens could be responsible for these two diseases.

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