Thyme Oil Reduces Biofilm Formation and Impairs Virulence of Xanthomonas oryzae
Xanthomonas oryzae pv. oryzae (Xoo), a common bacterial plant pathogen regulates its virulence and biofilm formation attribute via a chemical method of communication. Disabling this mechanism offers a promising alternative to reduce the virulence and pathogencity of the microorganism. In this study,...
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| Language: | English |
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Frontiers Media S.A.
2017-06-01
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| Series: | Frontiers in Microbiology |
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| Online Access: | http://journal.frontiersin.org/article/10.3389/fmicb.2017.01074/full |
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| author | Akanksha Singh Rupali Gupta Sudeep Tandon Rakesh Pandey |
| author_facet | Akanksha Singh Rupali Gupta Sudeep Tandon Rakesh Pandey |
| author_sort | Akanksha Singh |
| collection | DOAJ |
| description | Xanthomonas oryzae pv. oryzae (Xoo), a common bacterial plant pathogen regulates its virulence and biofilm formation attribute via a chemical method of communication. Disabling this mechanism offers a promising alternative to reduce the virulence and pathogencity of the microorganism. In this study, the effect of thyme (THY) oil on Quorum Sensing mediated synthesis of various virulence factors and biofilm formation was analyzed. Treatment of Xoo with 500 ppm THY oil displayed a significant diminution in swimming, swarming, exopolysaccharide and xanthomonadin secretion. However, no effect was observed on bacterial growth kinetics and metabolic activity of the cells. Results were further authenticated by RT-qPCR as significant reduction in motA, motB, and flgE genes was observed upon THY oil treatment. Similarly, the expression of some extracellular enzyme genes such as endoglucanase, xylanase, cellobiosidase, and polygalacturonase was also found to be significantly reduced. However, biochemical plate assays revealed insignificant effect of 500 ppm THY oil on secretion of protease, cellulase, and lipase enzymes. The rpfF gene known to play a crucial role in the virulence of the phytopathogenic bacteria was also significantly reduced in the THY oil treated Xoo cells. HPTLC analysis further revealed significant reduction in DSF and BDSF signaling molecules when Xoo cells were treated with 500 ppm THY oil. Disease reduction was observed in in vitro agar plate assay as lesion length was reduced in THY oil treated Xoo cells when compared with the alone treatment. GC–MS result revealed thymol as the active and major component of THY oil which showed potential binding with rpfF gene. Application of 75 μM thymol resulted in downregulation of gumC, motA, estA, virulence acvB and pglA along with rpfF. The other genes such as cheD, flgA, cheY, and pilA, were not found to be significantly affected. Overall, the results clearly indicated THY oil and its active component Thymol to be a potential candidate for the development of anti-virulence agent which in future when applied in combination with conventional bactericides might not only help in lowering the dose of bactericides but also be successful in curbing the disease progression in rice. |
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| id | doaj.art-e5b56799d45d4e709d6d5c458e7a3041 |
| institution | Directory Open Access Journal |
| issn | 1664-302X |
| language | English |
| last_indexed | 2024-12-22T04:19:52Z |
| publishDate | 2017-06-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Microbiology |
| spelling | doaj.art-e5b56799d45d4e709d6d5c458e7a30412022-12-21T18:39:19ZengFrontiers Media S.A.Frontiers in Microbiology1664-302X2017-06-01810.3389/fmicb.2017.01074241970Thyme Oil Reduces Biofilm Formation and Impairs Virulence of Xanthomonas oryzaeAkanksha Singh0Rupali Gupta1Sudeep Tandon2Rakesh Pandey3Department of Microbial Technology and Nematology, Central Institute of Medicinal and Aromatic Plants, Council of Scientific and Industrial ResearchLucknow, IndiaDepartment of Microbial Technology and Nematology, Central Institute of Medicinal and Aromatic Plants, Council of Scientific and Industrial ResearchLucknow, IndiaChemical Processing Department, Central Institute of Medicinal and Aromatic Plants, Council of Scientific and Industrial ResearchLucknow, IndiaDepartment of Microbial Technology and Nematology, Central Institute of Medicinal and Aromatic Plants, Council of Scientific and Industrial ResearchLucknow, IndiaXanthomonas oryzae pv. oryzae (Xoo), a common bacterial plant pathogen regulates its virulence and biofilm formation attribute via a chemical method of communication. Disabling this mechanism offers a promising alternative to reduce the virulence and pathogencity of the microorganism. In this study, the effect of thyme (THY) oil on Quorum Sensing mediated synthesis of various virulence factors and biofilm formation was analyzed. Treatment of Xoo with 500 ppm THY oil displayed a significant diminution in swimming, swarming, exopolysaccharide and xanthomonadin secretion. However, no effect was observed on bacterial growth kinetics and metabolic activity of the cells. Results were further authenticated by RT-qPCR as significant reduction in motA, motB, and flgE genes was observed upon THY oil treatment. Similarly, the expression of some extracellular enzyme genes such as endoglucanase, xylanase, cellobiosidase, and polygalacturonase was also found to be significantly reduced. However, biochemical plate assays revealed insignificant effect of 500 ppm THY oil on secretion of protease, cellulase, and lipase enzymes. The rpfF gene known to play a crucial role in the virulence of the phytopathogenic bacteria was also significantly reduced in the THY oil treated Xoo cells. HPTLC analysis further revealed significant reduction in DSF and BDSF signaling molecules when Xoo cells were treated with 500 ppm THY oil. Disease reduction was observed in in vitro agar plate assay as lesion length was reduced in THY oil treated Xoo cells when compared with the alone treatment. GC–MS result revealed thymol as the active and major component of THY oil which showed potential binding with rpfF gene. Application of 75 μM thymol resulted in downregulation of gumC, motA, estA, virulence acvB and pglA along with rpfF. The other genes such as cheD, flgA, cheY, and pilA, were not found to be significantly affected. Overall, the results clearly indicated THY oil and its active component Thymol to be a potential candidate for the development of anti-virulence agent which in future when applied in combination with conventional bactericides might not only help in lowering the dose of bactericides but also be successful in curbing the disease progression in rice.http://journal.frontiersin.org/article/10.3389/fmicb.2017.01074/fullbiofilmexopolysaccharidethyme oilvirulence factorsquorum sensing |
| spellingShingle | Akanksha Singh Rupali Gupta Sudeep Tandon Rakesh Pandey Thyme Oil Reduces Biofilm Formation and Impairs Virulence of Xanthomonas oryzae Frontiers in Microbiology biofilm exopolysaccharide thyme oil virulence factors quorum sensing |
| title | Thyme Oil Reduces Biofilm Formation and Impairs Virulence of Xanthomonas oryzae |
| title_full | Thyme Oil Reduces Biofilm Formation and Impairs Virulence of Xanthomonas oryzae |
| title_fullStr | Thyme Oil Reduces Biofilm Formation and Impairs Virulence of Xanthomonas oryzae |
| title_full_unstemmed | Thyme Oil Reduces Biofilm Formation and Impairs Virulence of Xanthomonas oryzae |
| title_short | Thyme Oil Reduces Biofilm Formation and Impairs Virulence of Xanthomonas oryzae |
| title_sort | thyme oil reduces biofilm formation and impairs virulence of xanthomonas oryzae |
| topic | biofilm exopolysaccharide thyme oil virulence factors quorum sensing |
| url | http://journal.frontiersin.org/article/10.3389/fmicb.2017.01074/full |
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