Roots and soil microbes coordinate teamwork using hormones and gene switches
Majeed N, Hassan S, Rather JH, Wani UM, John R
Mycorrhizal Networks
The mycorrhizal fungi partnering with roots in your garden beds or the legumes fixing nitrogen in your vegetable patch rely on this exact molecular back-and-forth to decide whether to let microbes in.
Underground, plant roots are constantly negotiating with helpful fungi and bacteria, deciding how much to let them in and how to reward them. This review pulls together what scientists know about two of the plant's control systems, tiny gene-silencing molecules called microRNAs and hormones like auxin and jasmonate, and shows how they work together to manage these partnerships. The authors also point out that a lot of the fine details, like which specific genes get switched on or off during these root-microbe conversations, still need to be worked out.
Key Findings
MicroRNAs and phytohormones jointly regulate the establishment and maintenance of nitrogen-fixing nodulation and arbuscular mycorrhizal symbioses in plant roots
Nine major phytohormone classes (auxin, cytokinin, ethylene, jasmonates, salicylic acid, abscisic acid, strigolactones, gibberellins, brassinosteroids) interact with miRNA pathways to control root development, defense, and microbial recruitment
Key knowledge gaps identified include functional validation of miRNA-target pairs, cross-kingdom small RNA trafficking between plants and microbes, and systemic shoot-root signaling mechanisms
chevron_right Technical Summary
Plants and beneficial soil microbes talk to each other using tiny genetic switches called microRNAs and plant hormones working together, helping roots decide when to team up with fungi and bacteria that boost nutrition and stress tolerance. Understanding this hidden chatter could help scientists breed crops that need less fertilizer and cope better with drought or poor soil.
Abstract Preview
Original paper
Hidden conversations beneath the soil: microRNA and hormone control of root symbioses.
Plants are found in dynamic soil ecosystems, which are highly enriched with microorganisms that have significant impacts on the health and productivity of plants. Promotion of nutrient uptake, fixa...
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