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Summa Phytopathologica

versão impressa ISSN 0100-5405versão On-line ISSN 1980-5454

Resumo

MELLO, Ana Paula de Oliveira Amaral; BEDENDO, Ivan Paulo  e  CAMARGO, Luís Eduardo Aranha de. Molecular identity of the phytoplasma associated to stunting of tomato and eggplant on the basis of analyses of the 16S rDNA. Summa phytopathol. [online]. 2007, vol.33, n.3, pp.258-263. ISSN 0100-5405.  https://doi.org/10.1590/S0100-54052007000300008.

Vegetable diseases occurring in the Brazilian territory and around the world have been associated with various phytoplasmas. In the region of Piracicaba-SP and Bragança-SP, in eggplant and tomato plants typical symptoms of stunting characterized by reduced canopy, leaf yellowing, proliferation of shoots, calix malformation, shortening internodes, reduced size of leaves, flowers and fruits were observed. In nested PCR with primers R16 mF1/mR2 e R16 F2n/R2, fragments of 1.2kb in size were amplified from symptomatic samples demonstrating the presence of phytoplasmas in plant tissues. By using especific primers pairs it was demonstrated that the phytoplasmas were affiliated to group 16SrIII. RFLP analysis using the restriction enzymes AluI, HpaII, KpnI, MboI, MseI, and RsaI confirmed that the phytoplasmas were representatives of group 16SrIII. Amplified DNA fragments were cloned in Escherichia coli, sequenced and compared by sequence similarities among themselves and with sequences belonging to phytoplasmas of group 16SrIII. Sequence similarities greater than 95% were found when the phytoplamas detected in tomato and eggplant were compared to the representatives of group 16SrIII. Values of 98-99% were obtained when sequences of phytoplasmas found in tomato and eggplant were compared among themselves. The results evidenced that tomato and eggplant stunting were associated with the same phytoplasma based upon the sequencing of the 16S rDNA gene.

Palavras-chave : Mollicutes; yellows; giant calix.

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