China provided North Korea with genetically modified grain since 2004, the anti-Beijing website Boxun reported on Sunday.
The website cited an official in China's Agriculture Ministry as saying that former leader Deng Xiaoping's daughter Deng Nan was responsible for sending the GMO grain to North Korea when she was in charge of supplying 1,000 tons of food aid to the North.
But North Korea has no idea that the grain it received from China was genetically altered, Boxun claimed.
The website has been responsible for several reports recently exposing the dark underbelly of Chinese politics, but some have been exaggerated or inaccurate.
Boxun claimed China gave North Korea 10 million tons of grain since 2004 or an average of 1.2 million tons a year. But the actual amount is estimated to be much smaller, ranging from 150,000 to 300,000 tons a year.