Table 2.
Summary of recent literature giving new insights into the specific secondary metabolites shaping the root microbiome
| Secondary metabolite | Effects on microbiome | Growth system | Functional mechanism | Target microorganism | Reference |
|---|---|---|---|---|---|
| Coumarins | • Altered microbial community assembly | • Arabidopsis; pots | • Differential microbial toxicity | • Verticillium dahliae JR2 • Fusarium oxysporum f. sp. raphani |
• Stringlis et al. (2018) |
| • Altered SynCom assembly | • Arabidopsis; hydroponics | • ROS production | • Pseudomonas sp. Root329 | • Voges et al. (2019) | |
| Benzoxazinoids | • Altered microbial community assembly • Soil legacy of pathogen suppression |
• Maize; field and pots | • Plant–soil feedback | • OTUs belonging to Proteobacteria and Chloroflexi | • Hu et al. (2018) |
| • Altered microbial community assembly | • Maize; pots | • Metabolic regulation | • OTUs belonging to Methylophilaceae and Xanthomonadaceae | • Cotton et al. (2019) | |
| • Altered microbial community assembly | • Maize; pots | • Gatekeeper effects | • OTUs belonging to Proteobacteria and Chloroflexi | • Kudjordjie et al. (2019) | |
| Camalexin | • Altered associations with plant growth-promoting bacteria | • Arabidopsis; plates | • Differential microbial toxicity | • Pseudomonas sp. CH267 | • Koprivova et al. (2019) |
| Glucosinolates | • Altered association with a plant growth-promoting fungus | • Arabidopsis; plates | • Integration of immune and nutrition status | • Colletotrichum tofieldiae | • Hiruma et al. (2016) |
| • Restriction of excessive fungal proliferation | • Arabidopsis; plates | • Toxicity of glucosinolate breakdown products | • Serendipita indica • Sebacina vermifera |
• Lahrmann et al. (2015) | |
| Triterpenes | • Altered microbial community assembly | • Arabidopsis; pots | • Differential impact on microbial growth rates | • Arthrobacter sp. strain A224 • Agromyces sp. strain A475-1 |
• Huang et al. (2019) |