Molecular characterization of phytoplasmas in lilies with fasciation in the Czech Republic.
Lilium spp. with symptoms of severe fasciation were observed in Southern and central Bohemia during the period 1999-2003. Nucleic acids extracted from symptomatic and asymptomatic plants were used in nested-PCR assays with primers amplifying 16S-23S rRNA sequences specific for phytoplasmas. The subsequent nested-PCR with phytoplasma group-specific primers followed by RFLP analyses and the 16S ribosomal gene sequencing, allowed classification of the detected phytoplasmas in the aster yellows group, subgroups 16SrI-B and 16SrI-C alone, and in mixed infection. Samples infected by 16SrI-C phytoplasmas showed different overlapping RFLP profiles after TruI digestion of R16F2/R2 amplicons. Two of these amplicons were sequenced, one of them directly and the other after cloning; sequence analyses and blast alignment confirmed the presence of two different overlapping patterns in samples studied. The sequences obtained were closely related, respectively, to operon A and operon B ribosomal sequences of the clover phyllody phytoplasma. Direct PCR followed by RFLP analyses of the tuf gene with two restriction enzymes showed no differences from reference strain of subgroup 16SrI-C. Infection with aster yellows phytoplasmas of 16SrI-B subgroup in asymptomatic lilies cv. Sunray was also detected.
DiSTA, Patologia vegetale, Alma Mater Studiorum, University of Bologna, viale Fanin, 42, 40127 Bologna, Italy. Bertaccini_a@biblio.cib.unibo.it
Assunta
A
Bertaccini
Jana
J
Fránová
Simona
S
Botti
Diana
D
Tabanelli
D018153:Czech Republic; D017931:DNA Primers; D004269:DNA, Bacterial / Q000032:analysis; D004275:DNA, Ribosomal / Q000032:analysis; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods; D020459:Genes, rRNA; D027762:Lilium / Q000382:microbiology*; D008969:Molecular Sequence Data; D045582:Phytoplasma / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification / Q000472:pathogenicity; D010935:Plant Diseases / Q000382:microbiology*; D016133:Polymerase Chain Reaction / Q000379:methods; D012150:Polymorphism, Restriction Fragment Length; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA
D017931:DNA Primers; D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S