TOKYO, March 20 (Xinhua) -- Tokyo stocks opened lower Tuesday with domestic technology-linked shares losing ground following a tech share selloff on Wall Street overnight on concerns of stiffer regulations for large technology companies.

As of 9:15 a.m., the 225-issue Nikkei Stock Average dropped 242.28 points, or 1.13 percent, from Monday to 21,238.62.

The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, lost 16.16 points, or 0.94 percent, at 1,703.81.

Precision instrument, electric appliance and mining-oriented issues comprised those that declined the most in the opening minutes after the morning bell.