Turning off one rice gene cuts toxic cadmium buildup in grain
Guo R, Wang HY, Zhong CW, Ma RR, Huang J
Crispr
Rice is a staple food for billions of people, and this gene discovery offers a concrete path toward breeding varieties that pull less toxic cadmium out of contaminated soil and into the grain you eat.
Rice plants have a gene called Os79 that normally makes them worse at handling cadmium, a toxic metal that can build up in farmland soil. When researchers deleted this gene using CRISPR gene editing, the rice plants grew healthier in cadmium-polluted conditions and absorbed much less of the metal into their tissues. The plants pulled this off by shutting down the doors that let cadmium in, building stronger cell walls that trap the metal outside, and ramping up their own antioxidant defenses.
Key Findings
Loss-of-function os79 mutants (via CRISPR-Cas9) showed enhanced growth and significantly reduced cadmium accumulation under Cd stress, while Os79-overexpression lines showed the opposite: greater Cd sensitivity and accumulation.
Os79 mutants downregulated cadmium uptake genes OsIRT1 and OsNRAMP5 while upregulating the vacuolar sequestration gene OsHMA3, rerouting cadmium away from sensitive tissues.
Mutants had higher pectin and hemicellulose content in root and shoot cell walls (improving Cd-binding capacity) plus elevated peroxidase and catalase activity, which lowered hydrogen peroxide and malondialdehyde levels and reduced oxidative damage.
chevron_right Technical Summary
Scientists found a rice gene called Os79 that, when switched off, helps rice plants grow better in cadmium-contaminated soil and pull less of the toxic metal into the plant. This discovery could lead to new low-cadmium rice varieties, making rice safer to eat in polluted farming regions.
Abstract Preview
Original paper
Os79, a UDP-Glycosyltransferase, negatively regulates cadmium tolerance and accumulation in rice.
Cadmium (Cd) contamination in agricultural soils poses a significant threat to global food safety. Reducing grain Cd accumulation in rice, a primary dietary source of this toxic metal, is therefore...
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