April 1 (Reuters) - Wall Street’s main indexes opened higher on Thursday, as technology shares, led by chipmakers, gained following an upbeat earnings outlook by Micron, while optimism about the U.S. economic growth lifted sentiment. The Dow Jones Industrial Average rose 73.0 points, or 0.22%, at the open to 33,054.58. The S&P 500 rose 19.9 points, or 0.50%, at the open to 3,992.78, while the Nasdaq Composite rose 167.5 points, or 1.26%, to 13,414.325 at the opening bell. (Reporting by Devik Jain in Bengaluru)