AMF-mediated root redistribution decreases Cd uptake in rice while enhancing phytoremediation in the S. nigrum/rice system.
Li R, Chen L, Zeng M, Zeng Z, Yang X
Phytoremediation
Soil contaminated with cadmium — from old mining sites, industrial runoff, or certain fertilizers — quietly loads into rice, and this research shows a common soil fungus can redirect that toxic metal into a weedy plant instead, leaving the rice cleaner.
Scientists grew rice next to a weed called black nightshade, which is unusually good at soaking up the toxic metal cadmium from soil. When they added a helpful soil fungus to the mix, the nightshade pulled even more cadmium out of the ground — up to 30% more — while the rice plants ended up with less cadmium in their leaves and shoots. The fungus seemed to reshape where both plants sent their roots, nudging them toward each other in a way that let the nightshade do the heavy lifting on metal cleanup.
Key Findings
AMF increased total cadmium removal from contaminated soil by 30.76% at 28 days and 18.93% at 56 days when black nightshade and rice were grown together.
Cadmium concentrations in rice shoots were significantly reduced at both 1 and 5 mg/kg soil cadmium levels when AMF was present, linked to lower soluble cadmium measured directly in the rice root zone.
AMF caused black nightshade to send 10.90% more roots into the rice growing zone, while AMF-inoculated rice extended more roots toward the nightshade, suggesting the fungus actively reorganizes root architecture to enhance metal capture.
chevron_right Technical Summary
Adding beneficial soil fungi (AMF) to fields where a cadmium-absorbing weed grows alongside rice can pull more heavy metal out of contaminated soil while keeping cadmium levels in rice grain-producing shoots safely low.
Abstract Preview
Harnessing arbuscular mycorrhizal fungi (AMF) in hyperaccumulator-crop intercropping holds promise for Cd remediation and food safety, yet its roles in root distribution and Cd dynamics remain uncl...
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Black nightshade is a common name for several plants and may refer to:Solanum americanum of much of North America Solanum nigrum of Europe