BEIJING, March 7 (Reuters) - China's state planner will step up efforts to stabilise domestic grain prices and will also seek stable coal prices and energy security, officials said on the sidelines of the country's parliament meeting on Monday.

Rising global commodity prices pose challenges to China's efforts to stabllise prices, said Hu Xucai, vice head of the National Development and Reform Commission. (Reporting by Dominique Patton Editing by Shri Navaratnam)