Chicago wheat extended gains from the previous session, after China's official think-tank revised down the nation's winter crop estimates, raising the prospect of higher imports by the world's biggest producer and consumer of the grain. 
Wheat sales to China out of the U.S. are an encouraging sign for the market and show that U.S. wheat is good value, said Luke Mathews, commodities strategist at the Commonwealth Bank of Australia, referring to numbers in a weekly report from the U.S. Department of Agriculture.