SciELO - Scientific Electronic Library Online

 
vol.33 issue4Molecular and pathogenic characterization of isolates of Xanthomonas albilineans (Ashby) Dowson, causal agent of sugarcane leaf scaldIncidence of stalk rot, rot grains and grain yield of maize hybrids submitted to the increase in plant density author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Summa Phytopathologica

Print version ISSN 0100-5405On-line version ISSN 1980-5454

Abstract

GONCALVES, Marcos César; MAIA, Ivan de Godoy; GALLETI, Sílvia Regina  and  FANTIN, Gisèle Maria. Mixed infection by Sugarcane mosaic virus and Maize rayado fino virus causing breaking yields in maize in São Paulo state. Summa phytopathol. [online]. 2007, vol.33, n.4, pp.348-352. ISSN 0100-5405.  http://dx.doi.org/10.1590/S0100-54052007000400005.

The two main viruses infecting maize in Brazil are Sugarcane mosaic virus (SCMV) and Maize rayado fino virus (MRFV), whose main vectors are the aphid Rhopalosiphum maidis and the leafhopper Dalbulus maidis, respectively. MRFV is frequently found in mixed infections with phytoplasms and spiroplasms causing the so-called corn stunting diseases. In a maize commercial field close to Santo Antonio da Posse, São Paulo state, surrounded by sugarcane fields, it was found a high incidence of plants showing mosaic, striping, stunting and cobs with decreased number of grains. Serological analysis with specific antisera detected the presence of SCMV and MRFV in these plants. SCMV infection was also confirmed by RT-PCR with specific primers and sequence analysis. In TEM observations of negatively stained preparations, flexuous (ca.770 nm) and isometric particles (ca.30 nm) were detected. In ultrathin sections, cytoplasmic inclusions, typical of Potyviridae, were observed; neither presence of spiroplasms nor phytoplasms could be noted. These results show that mixed infection by SCMV and MRFV might be responsible for the crop losses.

Keywords : Potyvirus; Marafivirus; Rhopalosiphum maidis; Dalbulus maidis.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf epdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License