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bacterial fruit blotch of melons

Chinese Journal of Agricultural Biotechnology (1)

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Detection of a quorum sensing signal molecule of Acidovorax avenae subsp. citrulli and its regulation of pathogenicity
Chen Tao, Qian Guo-Liang, Yang Xiao-Li, Ma Jun-Yi, Hu Bai-Shi, Liu Feng-Quan
Journal:

Chinese Journal of Agricultural Biotechnology / Volume 6 / Issue 1 / April 2009

Published online by Cambridge University Press:

24 April 2009, pp. 49-53

Print publication:

April 2009
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An efficient AHL (N-acyl-homoserine lactone) bioassay strain, JZA1, of Agrobacterium tumefaciens was used to detect the AHL production from Acidovorax avenae subsp. citrulli [the pathogen causing bacterial fruit blotch (BFB) of melons], and the results showed that A. avenae subsp. citrulli produced a 3-O-C8-homoserine (HSL) type signal molecule. Gene aiiA, which could degrade AHL molecules, was transformed into A. avenae subsp. citrulli strain NJF10, creating strain NJF10-aiiA. The AHL production from NJF10-aiiA was significantly reduced compared with wild-type NJF10. Inoculation tests showed that NJF10-aiiA had an obvious reduction of virulence on watermelon fruits. Our finds showed that AHL production by A. avenae subsp. citrulli was related to its pathogenicity. This work might provide a novel way to control BFB by QS (quorum sensing) interference.