March 2 (Reuters) - Canada’s commodity-heavy main stock index opened higher on Tuesday, tracking a rise in oil prices and as data showed better-than expected annualized GDP growth. At 9:30 a.m. ET (1430 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was up 41.86 points, or 0.23%, at 18,341.48. (Reporting by Devik Jain in Bengaluru; Editing by Maju Samuel)