Jan 21 (Reuters) - Canada's main index opened lower on

Tuesday, as falling energy shares overshadowed gains in

technology stocks, while uncertainties over U.S. President

Donald Trump's trade policies kept investors on edge.

At 9:31 a.m. ET (1431 GMT), the Toronto Stock Exchange's

S&P/TSX composite index was down 0.1% at 25,147.58.

(Reporting by Ragini Mathur in Bengaluru)