Shares of Blockbuster Inc. plunged nearly 17 percent on Tuesday after a new threat emerged to the world’s largest chain of movie-rental stores: Apple Inc. announced it now offers movie downloads via iTunes.

ITunes customers can now download older movies and those just released to DVD, in regular or high-definition format, to watch on their TVs, iPods, iPhones or computers.

A spokeswoman for Blockbuster said the Dallas-based company welcomed Apple CEO Steve Jobs’ announcement, made at the Macworld Conference and Expo in San Francisco Tuesday.

She said the new service would speed consumer use of movie downloads. Blockbuster bought the Movielink download service last year to add digital service to its store and by-mail offerings.

But investors saw things differently. Blockbuster shares fell 54 cents, or 16.7 percent, to close at $2.69 Tuesday. The damage wasn’t as poor at mail-delivery movie rental pioneer Netflix Inc., where shares fell 72 cents, or 3.2 percent, to $22.05 on Tuesday.

Apple

shares plus slipped, losing $9.74, or 5.5 percent, to close at $169.04, as investors seemed underwhelmed by the trendsetting company’s latest product, a slim MacBook Air notebook, additionally unveiled Tuesday. In after-hours trading Tuesday, Apple’s shares fell another 3.6 percent, to $163.01.

The six major Hollywood studios are supporting Apple’s new movie-download service, which began Tuesday in the United States and will be rolled out internationally later that year.

Apple’s service presented competitively priced — $3.99 for new DVD releases and $2.99 for older movies, plus $1 for either one for high-definition. Users can keep the movie for 30 days but have 24 hours to finish watching it once they start.

Apple said it would offer than 1,000 movies for rent online by the end of February.

Blockbuster said it now offers about 4,000 movies for sale or video-on-demand rental through Movielink, which gets titles from all the major studios and…

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