Tokyo stocks rose Wednesday morning, boosted by the technology sector that tracked overnight gains on Wall Street and the buying of issues in Japanese companies that announced share buyback plans the previous day. The 225-issue Nikkei Stock Average gained 135.09 points, or 0.35 percent, from Tuesday to 38,491.15. The broader Topix index was up 5.02 points, or 0.18 percent, at 2,735.97. The U.S. dollar traded mostly in the mid-156 yen zone as a wait-and-see mood prevailed ahead of U.S. consumer price index data for April due out later in the day, dealers said. At noon, the U.S. dollar fetched 1…