Analysis of 16S rDNA Sequences from Citrus Huanglongbing Bacteria Reveal a Different "Ca. Liberibacter" Strain Associated with Citrus Disease in São Paulo

Plant Disease
Helvecio D Coletta-FilhoMarcos A Machado

Abstract

Citrus huanglongbing (HLB, ex greening) is one of the most serious and destructive citrus diseases in the world. It is caused by a phloem-limited and nonculturable bacterium, "Candidatus Liberibacter". The disease occurs in some Asian and African countries and recently has been reported in the state of São Paulo, Brazil. Analysis of the 16S ribosomal (r)DNA of the HLB bacteria from orchards in São Paulo revealed the presence of two distinct strains of "Ca. Liberibacter". One of them, named LSg1 (Liberibacter sequence group 1), was 100% identical to strains from Japan (GenBank accessions AB038369 and AB008366), the Asian forms of the bacteria. The other, LSg2, is genetically distant from the Asian (96.1 to 96.3% identity) and African (95.8 to 96.1% identity) strains. Comparison of the 16S rDNA sequences from the LSg2 and the Asian strain revealed the presence of INDELs and point mutations. Specific primers designed for this Brazilian Liberibacter strain revealed that it is more widely distributed throughout the São Paulo orchards compared with the LSg1 strain. The HLB symptoms caused by both strains are almost identical and, interestingly, both strains were found in the same sample, revealing mixed infection in a citrus plant.

References

Jan 1, 1991·Journal of Bacteriology·W G WeisburgD J Lane
Jul 1, 1994·International Journal of Systematic Bacteriology·S JagoueixM Garnier
Jan 1, 1994·International Journal of Systematic Bacteriology·R G Murray, K H Schleifer
May 15, 1999·Journal of Clinical Microbiology·D M Olive, P Bean
Jan 12, 2001·FEMS Microbiology Reviews·R Rosselló-Mora, R Amann

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Citations

Aug 20, 2015·Journal of Agricultural and Food Chemistry·Deisy dos Santos FreitasGlaucia Braz Alcantara
Mar 1, 2009·Plant Disease·Lia W LieftingGerard R G Clover

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