Experiments demonstrate vanillin alters microbial community structures in cucumber seedlings, suggesting impacts on plant health.
Cucumber seedlings grown in soil were treated with different concentrations of vanillin (0.02-0.2 µmol/g dry soil). The rhizosphere Pseudomonas and Bacillus community structures and their abundances were determined by PCR-denaturing gradient gel electrophoresis and quantitative PCR analyses targeting the 16S rRNA genes, respectively. Vanillin at 0.02 µmol/g dry soil significantly increased the abundance of Pseudomonas community. At 0.1 and 0.2 µmol/g dry soil, it significantly increased the abundance of Bacillus community, but inhibited that of Pseudomonas spp. community. At 0.2 µmol/g dry soil, it changed the community structure of Pseudomonas and increased the Shannon-Wiener and evenness indices of Pseudomonas spp. community.
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Zhou et al. (2018) studied this question.
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