PagMYB74 orchestrates flavonoid-mediated plant-microbe feedback for drought resilience in poplar.
Liu S, Tan S, Li Q, He D, Xu L
Climate Adaptation
Poplar trees lining your streets or growing along riverbanks are quietly directing underground bacterial communities using chemical signals from their roots — and cracking that code means scientists can now engineer trees and potentially crops that summon their own drought-fighting helpers from the soil.
When poplar trees experience drought, they turn on a genetic switch that makes their roots release special plant compounds called flavonoids. These compounds act like a dinner bell, attracting a specific type of beneficial soil bacteria that then help the tree cope with the dry conditions. Scientists traced this whole process back to a single gene, mapping the complete chain from 'tree is thirsty' to 'helpful bacteria arrive and set up shop.'
Key Findings
PagMYB74 is the master regulator gene that drives root secretion of the flavonoids quercetin and kaempferol during drought stress, directly recruiting Pseudomonas bacteria to the root zone.
Drought triggers a phased, multi-stage wave of gene activation in poplar roots over a 13-week progressive drought period, culminating in a full flavonoid biosynthesis program.
Pseudomonas putida S110 colonization creates positive feedback in PagMYB74-overexpressing trees by enhancing phenylpropanoid metabolism and activating nutrient transport pathways, amplifying the symbiotic benefit.
chevron_right Technical Summary
Scientists discovered that a single gene (PagMYB74) in poplar trees controls how the tree recruits helpful soil bacteria during drought, by triggering the roots to release specific flavonoid compounds. This creates a self-reinforcing loop where the bacteria boost the tree's stress responses, revealing a complete chain from gene to microbe to survival benefit.
Abstract Preview
The interactions between plants and the soil microbiome play critical roles in regulating plant resistance to stresses. However, the process partly results from the complex interaction between root...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Species Mentioned
Was this useful?
Urban Tree Canopy Reduces Heat-Related Mortality by 39% in European Cities
Trees in your local park or street aren't just pretty — they are literally keeping people alive during heatwaves, and planting even a modest number of the ri...
Populus is a genus of 25–30 species of deciduous flowering plants in the family Salicaceae, native to most of the Northern Hemisphere. English names variously applied to different species include poplar, aspen, and cottonwood.