A representative scheme for low cadmium accumulation in rice. (IMAGE)

Okayama University

A representative scheme for low cadmium accumulation in rice.

Caption

In Pokkali, due to duplicated OsNramp5, the roots take up more Mn and Cd into the root cells compared with other rice varieties (for example, Koshihikari). 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 dotted arrow shows decreased Cd loading by high Mn. The cyan and purple colours indicate Mn and Cd, respectively.

Credit

Jian Feng Ma, Okayama University

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