Turning off one rice gene cuts toxic cadmium in grains
Huang J, Zhang Q, Yu FW, Liu MQ, Jing HK
Crop Improvement
Cadmium quietly accumulates in rice grown on contaminated paddy soil worldwide, and this gene tweak shows breeders can lower that toxic load without shrinking the harvest.
Rice plants absorb cadmium, a toxic heavy metal, from polluted soil and store some of it in the grains we eat. Researchers found a gene called OsGONST3 that acts like a doorway letting cadmium into the plant's roots and shoots, and when they switched that gene off, the rice took up less cadmium everywhere, including a 25% drop in the grain, while still growing and yielding normally in the field.
Key Findings
Cadmium exposure boosted OsGONST3 gene activity 3.4-fold in roots and 5.7-fold in shoots within 7 days
Mutant rice plants lacking OsGONST3 accumulated 22-25% less cadmium in roots, 13% less in shoots, and 16-21% less in xylem sap; overexpressing lines showed the opposite, with 28-42% more cadmium
Field-grown OsGONST3 mutants had 25-26% lower grain cadmium with no significant yield penalty
chevron_right Technical Summary
Scientists disabled a single rice gene, OsGONST3, and cut cadmium buildup in the grain by about a quarter, without losing any yield in field trials. That's a direct path toward safer rice in cadmium-contaminated paddy soils.
Abstract Preview
Original paper
Disruption of OsGONST3 reduces grain cadmium accumulation without yield penalty in field-grown rice.
Cadmium (Cd) pollution in paddy soils threatens global food safety. Identifying molecular gateways controlling grain Cd accumulation is essential for breeding low-Cd rice. A field-based screen of a...
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