Occurrence of two new groups of candidatus phytoplasmas infecting soybean in Cuba
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Abstract
New symptoms similar to those induced by phytoplasmas, but different from those reported to date, were observed on soybean plants, so the objective of this research was to determine the possible presence of other groups of phytoplasmas infecting soybean crops in Cuba. Fifty-seven soybean plants showing symptoms of blistering and severe leaf mosaic were collected in several localities of the Cuban eastern region in 2014 and analysed by nested-PCR with primers targeting the 16S ribosomal DNA (16S rDNA). Phytoplasmas were detected in 31.58 % of symptomatic soybean plants. Conventional and in silico RFLP analyses of 16S rDNA sequences revealed the presence of ‘Candidatus Phytoplasma pruni’ and ‘Candidatus Phytoplasma phoenicium’ strains. Phytoplasmas belonging to the proposed new ribosomal subgroup 16SrIII-Z and the ribosomal subgroup 16SrIX-A were identified. Phylogenetic analysis corroborated the RFLP analyses, in which the Cuban 16SrIII-Z and 16SrIX-A subgroups formed a clade with representative sequences of the 16SrIII and 16SrIX groups, respectively. 16SrIII-Z was the most widespread subgroup (72.22 % of positive samples). This is the first report of phytoplasmas belonging to the 16SrIII and 16SrIX groups occurring in soybean in the country.
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