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The yield on the government's April 14, 2010 benchmark also fell and closed over the critical 20 percent level, exceeding the 21 percent level in the day.
Turkish officials have sought to calm investors, arguing that the global turmoil will have a limited effect on the economy thanks to far-reaching IMF-backed reforms that stabilized the banking sector after two major financial crises in 1999 and 2001.
GLOBAL STOCKS DOWN
Global stock markets suffered another vicious sell-off on Wednesday in extremely volatile trade. After a calamitous day in Asia, Wall Street plunged at the open before rebounding slightly amid caution over the international bid to unblock frozen credit markets.
Frankfurt, London and Paris all tumbled by more than 4.0 percent as initial optimism over the rate cuts evaporated.
New York's Dow Jones Industrial Average rose 0.95 percent to 9,536 points around 1350 GMT, after plummeting 149.34 points in the first three minutes of trade.
The FTSE also sank earlier Wednesday after Britain's government had announced a 50-billion-pound part-nationalisation of the country's main banks as part of an emergency bailout package worth a total of 500 billion pounds.
Following the emergency round of rate cuts, the London FTSE lost 4.77 percent, Frankfurt fell 4.39 percent and Paris was down 4.59 percent in late afternoon European deals.
Arab stock markets tumbled for the fourth day running on Wednesday but the Saudi bourse, the region's largest, rebounded strongly after a coordinated international rate cut.