Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 217, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2021.112240
Keywords
Sedum alfredii; Root exudates; Thymol; Quorum sensing inhibitor; lasB
Categories
Funding
- National Natural Science Foundation of China [41403080]
- Key R&D Program of Zhejiang Province [2020C03083]
- Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment
Ask authors/readers for more resources
This study found that thymol from Sedum alfredii root exudates could inhibit the formation of protease and elastase in Pseudomonas aeruginosa by suppressing the expression of lasB, without any significant influence on the main las system as a potential natural QS inhibitor.
Quorum sensing (QS) plays an important role in the intensive communication between plants and microbes in the rhizosphere during the phytoremediation. This study explored the influence of the root exudates of hyperaccumulator Sedum alfredii on Pseudomonas aeruginosa based on QS. The effects of the components of root exudates, genes expression and transcription regulation of QS system (especially the las system) in Pseudomonas aeruginosa wild-type strain (WT) and rhl system mutant strain (Delta rhlI) were systematically analyzed and discussed. The WT and Delta rhlI exposed to gradient root exudates (0x, 1x, 2x, 5x and 10x) showed a concentrationcorrective inhibition on protease production, with the inhibition rates of 51.4-74.5% and 31.2-50.0%, respectively. Among the components of the root exudates of Sedum alfredii, only thymol had an inhibition effects to the root exudates on the activity of protease and elastase. The inhibition rates of 50 mu mol/L thymol on protease and elastase in WT were 44.7% and 24.3%, respectively, which was consistent with the variation in Delta rhlI. The gene expression of lasB declined 36.0% under the 1x root exudate treatment and 73.0% under the 50 mu mol/L thymol treatment. Meanwhile, there was no significant impact on N-3-oxo-dodecanoyl-L-homoserine lactone signal production and the gene expression of lasI and lasR. Therefore, thymol from Sedum alfredii root exudates could inhibit the formation of protease and elastase in Pseudomonas aeruginosa by suppressing the expression of lasB, without any significant influence on the main las system as a potential natural QS inhibitor.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available