CANADA STOCKS-TSX opens lower on China growth concerns

TORONTO, Sept 22 (Reuters) - Canada's main stock index opened lower on Monday as concerns about China's economic growth and weakness in commodity prices weighed on shares of natural resource producers. The Toronto Stock Exchange's S&P/TSX composite index was down 32.63 points, or 0.21 percent, at 15,232.72 shortly after the open. (Reporting by John Tilak Editing by W Simon)