Molecular characterization of Grapevine enamolike virus, a novel putative member of the genus Enamovirus.

2016

Isolado de Grapevine rupestris stem pitting-associated virus causando necrose das nervuras da videira.

Grapevine rupestris stem pitting-associated virus (GRSPaV) está associado à virose das caneluras do tronco de Rupestris, é transmissível pela enxertia, não possui vetores conhecidos e forma o complexo do lenho rugoso da videira. A doença é responsável por incompatibilidade da enxertia, brotação tardia, declínio e até morte de plantas. O objetivo do trabalho foi comprovar a associação de uma estirpe específica do GRSPaV com sintomas de necrose de nervuras.

Molecular characterization of grapevine enamo-like virus, a novel putative member of the genus enamovirus.

2016

Recombination events in full genome sequences of apple stem grooving virus.

2016

Development of Glomerella leaf spot is enhanced in virus-infected Maxi Gala apples.

Apples are commercially grown in Brazil in a subtropical environment that favors the development of fungal diseases such as Glomerella leaf spot (GLS) caused mainly by Glomerella cingulata (anamorph Colletotrichum gloeosporioides). The main objective of this work was to evaluate the effect of mixed infections by Apple stem grooving virus (ASGV) and Apple stem pitting virus (ASPV) on the infection and the colonization processes of C. gloeosporiodes in cv. Maxi Gala plants. Leaves of 16-month-old potted plants were spray-inoculated and both the disease incidence and lesion count were monitored over time and leaf severity was assessed in the final evaluation using an image analysis tool. Results showed that initial infection estimated from a monomolecular model fitted to progress of lesion count was higher and the incubation period (time to reach 50% incidence) was on average 10 h shorter in virus-infected plants compared to non-infected plants. It is hypothesized that initial events such as conidial germination and fungal penetration into plant cells were facilitated by the presence of viral infection. Also, final GLS severity was significantly higher in the virus-infected plants. Mixed infections by ASGV/ASPV seemed to make apple leaves more susceptible to the initial infection and colonization by C. gloeosporioides.

Avian infectious bronchitis virus (IBV): differential pathological and immunological profiles of two Brazilian variants.

2015