Dual-functionality effects of natural mixtures of bacterial volatile compounds on plant growth

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Title
Dual-functionality effects of natural mixtures of bacterial volatile compounds on plant growth
Author(s)
Geun Cheol Song; Je-Seung Jeon; H J Sim; Soohyun Lee; Jihye Jung; S G Kim; S Y Moon; Choong-Min Ryu
Bibliographic Citation
Journal of Experimental Botany, vol. 73, no. 2, pp. 571-583
Publication Year
2022
Abstract
Bacteria emit volatile compounds that modulate plant growth. Previous studies reported the impacts of bacterial volatile compounds on plant growth; however, the results varied depending on bacterial nutrient availability. We investigated whether the effects of plant growth-inhibiting volatiles (PGIVs) and plant growth-promoting volatiles (PGPVs) depended on the perceived dose by evaluating the growth of Arabidopsis thaliana seedlings placed at 7, 14, and 21 cm away from Bacillus amyloliquefaciens GB03 colonies growing in rich medium. A large bacterial colony (500 μl inoculum) inhibited plant growth at 7 cm and promoted growth at 21 cm, whereas a small bacterial colony (100 μl inoculum) induced the opposite pattern of response. We identified pyrazine and 2,5-dimethylpyrazine as candidate PGIVs that significantly reduced plant growth at a distance of 7 cm. PGIV effects were validated by exposing plants to synthetic 2,5-dimethylpyrazine and bacteria emitting PGPVs, which showed that PGIVs overwhelm PGPVs to rapidly increase salicylic acid content and related gene expression. This is referred to as the defence-growth trade-off. Our results indicate that high PGIV concentrations suppress plant growth and promote immunity, whereas low PGPV concentrations promote growth. This study provides novel insights into the complex effects of bacterial volatile mixtures and fine-tuning of bacteria-plant interactions.
Keyword
Bacteria-plant interactionsBacterial volatile compounds (BVCs)Plant growth?inhibiting volatiles (PGIVs)Plant growth?promoting volatiles (PGPVs)Pyrazine2,5-dimethylpyrazine
ISSN
0022-0957
Publisher
Oxford Univ Press
DOI
http://dx.doi.org/10.1093/jxb/erab466
Type
Article
Appears in Collections:
Division of Research on National Challenges > Infectious Disease Research Center > 1. Journal Articles
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