(New throughout, updates with U.S. trading, changes byline, dateline) * Wheat extends gains into second session * Traders await USDA reports due on Monday By Tom Polansek CHICAGO, June 26 (Reuters) - U.S. soybean futures rose on Thursday as stronger-than-expected export sales re-ignited concerns about dwindling old-crop supplies. Corn futures advanced for the first time[...]
