UPDATE 1-Swimming-Canadian teenager breaks breaststroke record

* 15-year-old Reason breaks women's 50m breaststroke record

* Breaks Australian Jade Edmistone's mark (Adds details, quotes)

MONTREAL, July 8 (Reuters) - Teenager Amanda Reason broke the world record in the women's 50-metre breaststroke on Wednesday at the Canadian trials for the world swimming championships.

The 15-year-old Reason clocked 30.23 seconds to eclipse the previous mark of 30.31 seconds set by Australia's Jade Edmistone in 2006.

"This is just amazing," Reason told reporters. "I'm speechless, incredible.

"My coach said I had to go out fast and get my head into the motion.

"I did that well in the beginning and kept pushing it through to the end and I did it."

The world record is the first by a Canadian in a long course pool since Allison Higson broke the 200 breaststroke mark in 1988.

Reason won the bronze medal in the 50 breaststroke at the world junior championships and in January took silver at the junior Pan Pacific championships.

The 50m breaststroke is a world championship event but is not raced at the Olympics.

(Reporting by Steve Keating in Indianapolis; Editing by Greg Stutchbury/Ian Ransom; To query or comment on this story email sportsfeedback@thomsonreuters.com)