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Bioactivities evaluation of an endophytic bacterial strain Bacillus velezensis JRX-YG39 inhabiting wild grape
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Bioactivities evaluation of an endophytic bacterial strain Bacillus velezensis JRX-YG39 inhabiting wild grape
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Bioactivities evaluation of an endophytic bacterial strain Bacillus velezensis JRX-YG39 inhabiting wild grape
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Journal Article
Bioactivities evaluation of an endophytic bacterial strain Bacillus velezensis JRX-YG39 inhabiting wild grape
2022
Overview
Background
Botrytis cinerea
can cause serious disease on lots of plant hosts during growth and postharvest storage. Biocontrol is known to be eco-friendly methods to control pathogens. Plant endophytic bacteria are generally considered as beneficial organisms, since they can promote plant growth and enhance plant immune system. Thus, screening biological control agents is very important for sustainable plant protection.
Results
Fifty-six endophytic bacteria were obtained from wild grape. Sixteen isolates and their extracts exhibited significant antifungal activity against
B. cinerea
. Particularly, strain JRX-YG39 with the strongest inhibition ability had a broad-spectrum antifungal activity. Combining 16S rDNA analysis and the phylogenetic results based on
gyr
A and
gyr
B genes, JRX-YG39 was assigned as
Bacillus velezensis
. JRX-YG39 could produce bioactive VOCs and obviously depressed mycelia growth of
B. cinerea
. It was confirmed that VOCs released by JRX-YG39 could significantly promote growth and induce defense of
Arabidopsis thaliana
. Thirty-one bioactive secondary metabolites were further identified from JRX-YG39 culture by gas chromatography–mass spectrometry analysis. Dibutyl phthalate, a potential antifungal substance, was the major compound accounting for 78.65%.
Conclusions
B. velezensis
JRX-YG39 has wide broad-spectrum antagonistic activity and significant plant promotion activity. Hence,
B. velezensis
JRX-YG39 will provide a valuable constituent of modern agricultural practice as biofertilizers and biocontrol agents.
