Assessment of the genetic diversity of Xylella fastidiosa isolated from citrus in Brazil by PCR-RFLP of the 16S rDNA and 16S-23S intergenic spacer and rep-PCR fingerprinting |
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Authors: | Angela Mehta Rui Pereira Leite Jr. Yoko Bomura Rosato |
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Affiliation: | (1) Centro de Biologia Molecular e Engenharia Genética (CBMEG), Universidade Estadual de Campinas -UNICAMP, PO Box 6010, 13083-970 Campinas, SP, Brazil;(2) Instituto Agronômico do Paraná (IAPAR), PO Box 481, 86001-970 Londrina, PR, Brazil |
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Abstract: | The genetic diversity among twenty three strains of Xylella fastidiosa, isolated from sweet orange citrus, was assessed by RFLP analysis of the 16S rDNA and 16S-23S intergenic spacer and by rep-PCR fingerprinting together with strains isolated from coffee, grapevine, plum and pear. The PCR products obtained by amplification of the 16S rDNA and 16S-23S spacer region were digested with restriction enzymes and a low level of polymorphism was detected. In rep-PCR fingerprinting, a relationship between the strains and their hosts was observed by using the BOX, ERIC and REP primers. Two major groups were obtained within the citrus cluster and relationships to the geographic origin of the strains revealed. Citrus strains isolated from the States of São Paulo and Sergipe formed one group and strains from the Southern States formed another group. Distinct origins of X. fastidiosa in the Southern and Southeastern States is postulated. The pear isolate was distantly related to all of the other X. fastidiosa strains. |
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Keywords: | BOX ERIC REP RFLP-16S RFLP-ITS Xylella fastidiosa |
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