Year: 2017 | Month: August | Volume 10 | Issue 4
Antivirulence activity of essential oils against Xanthomonas oryzae pv. oryzae causing bacterial blight of Oryza sativa
The majority of bacterial diseases currently being treated use the traditional antibiotic therapy which gives way to the development of multidrug-resistant bacteria. The seriousness further increases in the microbes which form resilient biofilms. Therefore, researchers around the globe are working towards the development of new bactericides which do not impose the above conditions. The present investigation was thus carried out with the aim to screen natural essential oils from different plant parts against Xanthomonas oryzae, causal organism of leaf blight disease in rice. The results revealed decrement in biofilm formation at 1000 ppm in 9 oils out of 15 without considerable decrease in total colony forming units. However, the motility traits viz. swimming was maximally reduced in case of calamous and cajeput oil while swarming was decreased significantly in jatamansi and costus root oil. The other virulence traits like protease and exopolysaccharide responsible for the pathogenecity of the bacterium was maximally reduced in calamous and jatamansi oils. However, maximum decrease in lipase was observed in case of costus root oil. Overall, the results highlight potential anti virulence property of calamous, costus and jatamansi oil which can be in future used for the development of potential bactericide against X. oryzae.
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