CHD-18g-modulated Pseudomonas taxa support poplar salt tolerance.
Liao Y, Zhang Q, Zheng J, Zhang J, Dai T
Soil Health
Poplar trees planted along roadsides and in restored wetlands are quietly recruiting their own bacterial allies through root chemistry—and understanding that trick could help us grow more resilient trees in the salt-damaged soils spreading across agroforestry landscapes worldwide.
Salt-tolerant poplar trees have a special ability: they release certain natural chemicals from their roots that attract helpful bacteria in the soil. Researchers found that one particular gene controls this chemical release, and when that gene is more active, more beneficial bacteria show up—and the tree handles salty conditions much better. It's essentially the tree sending out a chemical invitation to its microbial partners when times get tough.
Key Findings
The gene CHD-18g, which encodes an enzyme in the phenylpropanoid pathway, was upregulated in salt-tolerant poplar varieties and directly increased root secretion of benzoic acid and salicylic acid under salt stress.
Overexpressing CHD-18g in poplar significantly increased the abundance of Pseudomonas bacteria in the rhizosphere, demonstrating a direct genetic link between host metabolism and microbiome composition.
Benzoic acid-induced Pseudomonas bacteria demonstrably reduced salt stress symptoms and promoted poplar growth under saline conditions in controlled binary interaction assays.
chevron_right Technical Summary
Scientists discovered that salt-tolerant poplar trees activate a specific gene (CHD-18g) that boosts production of two natural compounds—benzoic acid and salicylic acid—which in turn attract beneficial Pseudomonas bacteria to the roots, helping the trees survive salty soils. This plant-microbe partnership offers a new strategy for breeding or engineering trees that thrive in increasingly saline landscapes.
Abstract Preview
Against the background of global climate change, soil salinization has emerged as a major abiotic stressor constraining agroforestry productivity worldwide. Root-recruited microbes enhance plant st...
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.