Genome sequence and genetic diversity of the Huanglongbing pathogen Cadidatus liberibacter asiaticus
S. THAPA (1), W. Ma (2), N. Wang (3), J. Franco (1), G. Coaker (1) (1) University of California Davis, U.S.A.; (2) University of California Riverside, U.S.A.; (3) University of Florida, U.S.A.

Huanglongbing (HLB) is one of the most destructive citrus diseases and has caused tremendous damage to the citrus industry worldwide. It is caused by the Gram-negative bacterial pathogen Candidatus Liberibacter asiaticus (CLas). In the United States, HLB has been detected in Florida, Texas, and California. CLas is psyllid transmitted and resides in the phloem. In order to gain greater insight into CLas biology and genetic diversity, we have initiated genome sequencing and comparative analyses of CLas from different geographical regions. CLas strains from Texas, Florida, California, and China have been sequenced. CLas contains the Sec secretion system, through which a variety of sec delivered effectors (SDEs) may be secreted into the phloem. We have mined genome sequences to identify core SDEs. Data will be presented on the identity and conservation of the CLas effector repertoire as well as phylogenetic relationships between different strains. Genomic analyses of CLas strains from different geographical regions will facilitate a greater understanding of CLas population structures, virulence components, and will aid in the development of tools for molecular diagnosis.

Abstract Number: S1-2
Session Type: Special Session