Genetic diversity and population structure of 'Candidatus Liberibacter asiaticus' associated with citrus Huanglongbing in India based on the prophage types.

World Journal of Microbiology & Biotechnology
A K DasS Nerkar

Abstract

Huanglongbing (HLB), also known as 'citrus greening', is an extremely destructive disease of citrus worldwide. HLB is associated with three species of the fastidious proteobacterium, Candidatus Liberibacter asiaticus (CaLas), Ca. L. africanus and Ca. L. americanus with CaLas being the most widely distributed around the world and the only species detected and described so far in India, one of the major global citrus fruit producers. Prophages are highly dynamic components in the bacterial genome and play an important role in intraspecies variations. Three types of prophages, Type 1, Type 2 and Type 3 have been identified and described in CaLas so far. In the present study, 441 CaLas isolates sampled across 18 Indian states were used for prophage typing. Based on detection of three prophage types by PCR, all the eight probable combinations of CaLas prophages were identified, including single Type 1 (26.5%), single Type 2 (18.8%), single Type 3 (1.4%), Type 1 + Type 2 (20.4%), Type 1 + Type 3 (12.5%), Type 2 + Type 3 (4.8%), Type 1 + Type 2 + Type 3 (11.3%) and None type (4.3%). Prophage types were confirmed by PCR amplicon sequencing and subsequent phylogenetic analysis. By discovery of all 3 prophages and based on genetic identi...Continue Reading

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