Poplar trees use a protein switch to safely store cadmium in contaminated soil
Chen X, Liu M, Yang J, Zhu K, Xiao K
Phytoremediation
Poplar trees planted along old industrial corridors and contaminated lots could be doing far more cleanup work than previously engineered, and this discovery hands breeders a specific molecular dial to turn up that capacity.
Researchers found two proteins in poplar trees that work as a team to help the tree survive in cadmium-poisoned soil. One protein acts like an on-switch, turning on the other protein that pulls cadmium into the tree and packages it so it can't cause damage. Poplars engineered with more of the second protein grew better in toxic conditions and stored more cadmium throughout their leaves, stems, and roots.
Key Findings
PyWRKY48 directly binds the W-box element in the PyMTP10 promoter, confirmed by yeast one-hybrid, dual-luciferase, and EMSA assays
PyMTP10-overexpressing poplar showed increased growth, chlorophyll content, and antioxidant enzyme activity under cadmium stress compared to controls
Overexpression of PyMTP10 elevated cadmium accumulation across all plant tissues alongside higher levels of glutathione and phytochelatins, the chelating compounds that sequester the metal
chevron_right Technical Summary
Scientists identified a two-gene switch in poplar trees that controls how the trees tolerate and absorb cadmium, a toxic heavy metal common in polluted soils. The regulatory protein PyWRKY48 directly turns on PyMTP10, which together boost the tree's ability to pull cadmium out of contaminated ground and lock it safely inside plant tissues.
Abstract Preview
Original paper
PyWRKY48 directly activates PyMTP10 to confer cadmium tolerance and accumulation in poplar.
Cadmium (Cd) contamination is a major environmental concern that threatens plant growth and human health. Poplar (Populus spp.) is a promising candidate for phytoremediation due to its high biomass...
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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.