Aug 8 (Reuters) - Canada's main stock index opened slightly lower on Wednesday, as losses in shares of auto parts maker Magna International MG.TO dragged down the consumer discretionary sector.
* At 9:31 a.m. ET (1331 GMT), the Toronto Stock Exchange's S&P/TSX Composite index .GSPTSE was down 13.13 points, or 0.08 percent, at 16,273.17.