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• W2022993222 abstract "Phytoplasmas of the 16SrVII group in ornamental Fraxinus uhdei trees (1) growing in different cities of the Colombian Andes have been reported (2). In surveys made in Bogotá during March and May 2011, symptoms suggestive of phytoplasma infection were observed in ornamental woody species: Croton spp. (Euphorbiaceae), Pittosporum undulatum (Pittosporaceae) and Populus nigra (Salicaceae) trees, growing close to infected F. uhdei (Oleaceae). Symptoms included witches' broom, yellowing, dieback, epicormic sprouts, tufted foliage, abnormal elongation or shortening of internodes, and deliquescent branching leading to dramatic changes in crown architecture. P. undulatum and F. uhdei are introduced species representing the second and third most abundant trees in the city. P. nigra is an introduced species and Croton spp. is an Andean genus. In order to screen for the presence of phytoplasmas in Croton spp., P. undulatum, and P. nigra, four individuals of each species and two F. uhdei trees were sampled. For DNA extraction, 1 g of vascular tissue from young stems was used. Samples were tested by nested PCR with primers P1A/P7A (4) followed by R16F2n/R16R2 (3). The frequency of phytoplasma detection varied among species; P. undulatum and Croton spp. had three positives each, while P. nigra had one positive. Both F. uhdei were positive. Sequences from the amplicons (three reads) were aligned. BLAST analysis of 16S rDNA sequences from the four species tested had 99.2 to 99.7% similarity to 16SrI group sequences. Phylogenetic analysis further confirmed this relationship. Virtual sequence analysis using the iPhyclassifier tool ( http://plantpathology.ba.ars.usda.gov/cgi-bin/resource/iphyclassifier.cgi ) showed that the sequence derived from P. undulatum (JQ730861) produced an identical RFLP pattern to group 16SrI-B (reference sequence NC_005303). RFLP similarity coefficients of the phytoplasmas from F. uhdei, Croton spp., and P. nigra (JQ730859, JQ730859 and JQ730861) were less than 0.97, suggesting the presence of a new subgroup within group 16SrI. The vectors of phytoplasmas are unknown in the region. Phytoplasma hosts previously reported in Colombia are: Solanum quitoense (16SrIII), Manihot esculenta (16SrIII), Liquidambar styraciflua (16SrI and 16SrVII), Elaeis guineensis (16SrI and 16SrIII), Coffea arabica (16SrIII), Cordia alliodora (16SrIII), Solanum tuberosum (16SrV and 16SrXII), and Zea mays (16SrI). To our knowledge, this is the first report of Croton spp. and P. undulatum as phytoplasma hosts. Phytoplasmas of group 16SrI are known to infect more than 100 species of different families worldwide. Detection of this group in several tree species and the observation of similar symptoms in other trees species raises concerns about a possible epidemic affecting plants in the Andean region. Implications are at several levels: i) epidemiological, with infected trees representing a potential inoculum source for other ornamental plants or crops growing in the agricultural surrounding areas; ii) economic, since eventually it will be necessary to replace diseased plants; and iii) environmental, because of the negative impact on the services provided by trees and green areas. References: (1) J. J. Filgueira et al. Plant Pathology 53:520, 2004. (2) L. Franco-Lara et al. Fitopatología Colombiana 29:32, 2005. (3) D. E Gundersen et al. Phytopathol. Mediterr. 35:144, 1996. (4) I-M. Lee et al. Int. J. Syst. Evol. Microbiol. 54:1037, 2004." @default.
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• W2022993222 title "First Report of ‘<i>Candidatus</i> Phytoplasma asteris’ Affecting Woody Hosts (<i>Fraxinus uhdei, Populus nigra, Pittosporum undulatum</i>, and <i>Croton</i> spp.) in Colombia" @default.
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