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Genomic island-based plasticity among the genomes of rice-pathogenic Burkholderia glumae and B. gladioli strains.
F. FRANCIS (1), J. Kim (2), J. Ham (1). (1) Louisiana State University Agricultural Center, Baton Rouge, LA, U.S.A.; (2) Louisiana State University, Center for Computation & Technology, Baton Rouge, LA, U.S.A.

Phytopathogenic <i>Burkholderia</i> species are the etiological agents of diseases for diverse flora and cause symptoms such as blight, wilt and rot. <i>Burkholderia glumae</i> and <i>B. gladioli</i> are important causal agents of bacterial panicle blight of rice, which is becoming an increasingly significant problem in global rice production. To better understand its genome-scale characteristics, the genome of the highly virulent <i>B. glumae</i> strain 336gr-1, isolated from Louisiana, was sequenced using Illumina Genome Analyser II. The 336gr-1 genome was aligned and compared with the previously sequenced genomes of <i>B. glumae</i> strain BGR1 and <i>B. gladioli</i> strain BSR3, which were isolated from infected rice plants in South Korea. Comparative analyses among the three strains revealed unique regions present in their genomes. Many of these unique regions correspond to genomic islands that contain mobile elements such as phage-related genes. A significant amount of plasticity was observed in these closely related strains of <i>Burkholderia</i> that are capable of infecting the same host plant. This finding may explain the versatility of <i>Burkholderia</i> members under various environmental conditions.<p><p>Keywords: Bacteria-Phytoplasma-Spiroplasma-Fastidious Prokaryote, Cereals-Grains, Rice

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