The duplication of a transporter gene reduces toxic cadmium accumulation in rice without harming quality or yield, according to the researchers. Rice is a staple food for almost half of the world's population. However, compared to other cereals like barley and wheat, it absorbs more cadmium from
The duplication of a transporter gene reduces toxic cadmium accumulation in rice without harming quality or yield, according to the researchers.
In Pokkali, due to duplicated OsNramp5, the roots take up more Mn and Cd into the root cells compared with other rice varieties . Most Cd taken up through OsNramp5 is sequestered into vacuoles by OsHMA3, while most Mn is translocated to the shoots through OsMTP9. Higher Mn concentration in the root cells competes with Cd for an unidentified efflux transporter, resulting in decreased loading of Cd to the xylem and subsequently to the shoots and grains.
The researchers also discovered that OsNramp5’s spatial expression level was consistently about two times greater in the roots of Pokkali than in Koshihikari.
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