National Corn Growers Association Chief Executive Officer Rick Tolman said Japan wanted assurances from the US Food and Drug Administration about the safety of the Bt10 corn strain in food and feed.

"Japan is looking for a strong statement from the FDA on this being approved," Tolman said in an interview after meeting with top Bush administration officials.

But Tolman said the FDA does not have oversight in the Syngenta case.

Both the US Agriculture Department and the Environmental Protection Agency have concluded that the Bt10 strain does not pose a danger to people, animals or plants.

USDA officials were expected to seek clarification from Japan on what exactly Tokyo wanted. Tolman said the issue "should be resolved shortly."

Tolman said Tokyo was also close to deciding whether to begin testing for Bt10 in US corn shipments.

"Syngenta has delivered tests to Japan and they are currently looking at the tests to verify them and make sure that it is what they want to do," he said.

Earlier this month, Europe blocked imports of US maize animal feed and grains unless there was proof the shipments did not contain the biotech strain.

The European Union this week approved the Syngenta tests, enabling imports of US maize animal feed and grains to resume.

"They (USDA) reassured us that things were pretty well straightened out with the EU," he said.

USDA has fined Syngenta $375,000 for the mistake. The EPA was expected to conclude its own separate investigation soon.