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Hydrogen cyanide produced by <i></i>Pseudomonas chlororaphis<i></i> O6 is a key aphicidal metabolite.
Canadian Journal of Microbiology 2018 November 7
A biocontrol bacterium <i></i>Pseudomonas chlororaphis<i></i> O6 promotes plant health through multifaceted mechanisms. In this study, we used <i></i>P. chlororaphis<i></i> O6 mutants to examine metabolites with aphicidal activity. Direct application of intact <i></i>P. chlororaphis<i></i> cells to the surface of second instar nymphs of the green peach aphid resulted in no mortality. However, nymphs died when exposed only to the volatiles produced by the <i></i>P. chlororaphis<i></i> O6 wild-type strain when growing on rich media. Mutants lacking in production of two antibiotics, phenazine and pyrrolnitrin, or the insect toxin, FitD, retained the aphicidal potential of the wild type strain. However, the volatiles produced by mutants defective in the lacking production of hydrogen cyanide (HCN) or with a defect in the synthesis of a global regulator, GacS, which regulates HCN synthesis, showed no aphicidal activity. Direct application of potassium cyanide caused mortality of green peach aphid nymphs. These results indicate that HCN production by a plant probiotic is involved in preventing insect growth.
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