First report on sweet potato symptomless virus 1 in Ipomoea batatas in state of Rio Grande do Sul, Brazil.
This paper presents the results of a survey of sweet potato fields conducted in Pelotas, Rio Grande do Sul state, Brazil, to determine the presence and incidence of Sweet potato symptomless virus 1 (SPSMV-1), a new virus in the genus Mastrevirus (family Geminiviridae). A total of 303 asymptomatic leaf samples of sweet potato local varieties were randomly collected from different producing regions in Pelotas rural zone (districts 3, 6, and 9) between February and May of each year (2013 and 2014). Polymerase chain reaction assays and nucleotide sequence comparisons were carried out to confirm the identity of the pathogen. SPSMV-1 virus was detected only in the local variety 'Pé de galinha', which has the following morphological characteristics: leaves with five lobes and slightly yellowish peel and pulp. This is thought to be the first report of SPSMV-1 infecting sweet potato in Rio Grande do Sul.