Australian shares have opened lower following significant losses on Wall Street overnight amid renewed concerns about US-China trade tensions.

The benchmark S&P/ASX200 index was down 51.3 points, or 0.81 per cent, to 6,244.4 points at 1015 AEST on Wednesday, while the broader All Ordinaries was down 53.5 points, or 0.84 per cent, to 6,330.0.

All sectors of the ASX were in negative territory after the first 15 minutes of trade, with tech shares collectively tumbling 2.27 per cent to lead losses.

On Wall Street, the Dow Jones Industrial Average finished down 1.79 per cent -its second-biggest daily percentage drop of the year – while the S&P 500 was down 1.65 per cent and the tech-heavy Nasdaq Composite was down 1.96 per cent.

Comments from US officials overnight raised concerns among some investors that trade talks between China and the United States could take much longer to resolve than previously thought.

The Aussie dollar is buying 70.09 US cents from 70.35 US cents on Tuesday.