| Title: | Dual functionality of natural mixtures of bacterial volatile compounds on plant growth |
| Author(s): | Song GC; Jeon JS; Sim HJ; Lee S; Jung J; Kim SG; Moon SY; Ryu CM; |
| Address: | "Molecular Phytobacteriology Laboratory, KRIBB, Daejeon 34141, S. Korea. Center for Genome Engineering, Institute for Basic Science (IBS), Daejeon 34126, S. Korea. Environmental Safety Assessment Center, Korea Institute of Toxicology (KIT), 17 Jegok-gil, Munsan-eup, Jinju 52834, South Korea. Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea. Biosystems and Bioengineering Program, University of Science and Technology (UST), Daejeon 34113, S. Korea" |
| ISSN/ISBN: | 1460-2431 (Electronic) 0022-0957 (Linking) |
| 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 mul inoculum) inhibited plant growth at 7 cm and promoted growth at 21 cm, whereas a small bacterial colony (100 mul 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" |
| Keywords: | "*Arabidopsis Bacteria Plant Development Seedlings *Volatile Organic Compounds 2, 5-dimethylpyrazine Bacteria-plant interactions bacterial volatile compounds (BVCs) plant growth-inhibiting volatiles (PGIVs) plant growth-promoting volatiles (PGPVs) pyrazine;" |
| Notes: | "MedlineSong, Geun Cheol Jeon, Je-Seung Sim, Hee-Jung Lee, Soohyun Jung, Jihye Kim, Sang-Gyu Moon, Sun Young Ryu, Choong-Min eng Research Support, Non-U.S. Gov't England 2021/10/23 J Exp Bot. 2022 Jan 13; 73(2):571-583. doi: 10.1093/jxb/erab466" |
