Authorities have stressed that this approval of experimentation does not equate to a broader official favoring of GM grains.

"The granting of safety certificates for GM food is not equal to allowing commercial production," Tuesday's statement quoted an anonymous official as saying.

Approval is needed for GM crops, be it production of seeds, testing or growing, the official added.

The ministry has ordered all provincial agricultural authorities to strengthen oversight and fight illegal production and sale of seeds for GM crops, according to the statement.

Chen Xiaohua, deputy minister of the MOA, said earlier this year that China would continue to take an "active and cautious" policy toward GM crops and had set no timetable on the commercial production of GM products.