* China says Europe remains key market
* High-risk currencies gain as stocks, commodities climb
* U.S. jobless claims fall, U.S. Q1 GDP revised down (Adds quotes, updates prices, changes byline)
By Wanfeng Zhou
NEW YORK, May 27 (Reuters) - The euro jumped across the board on Thursday after China said Europe remains a key investment market for its foreign-exchange reserves while a global stocks rally buoyed risk appetite.
China's central bank said a Financial Times report that Beijing was concerned about its euro zone bond holdings was groundless. The report had driven the euro to a near four-year low against the dollar earlier in the global session. For more, see [
]Strong gains in European <
> and U.S. shares <.SPX> also helped support the euro, while the yen came under broad pressure as investors put on riskier bets funded by cheap borrowing in the Japanese currency."In general, we're seeing an unraveling of yesterday's action," said Tim O'Sullivan, chief dealer at Forex.com in Bedminster, New Jersey.
"We're following the equity markets. The dollar/yen started to gain some traction ... and that's dragging the whole risk trade up, which is giving another boost to the euro," he said.
In afternoon New York trading, the euro <EUR=EBS> traded 1.8 percent higher at $1.2395, having earlier climbed as high as $1.2395, according to electronic trading platform EBS.
Kuwait Investment Authority on Thursday also denied a media report that it is reducing its exposure to euro zone investments and affirmed it is a long-term investor in Europe. [
]Meanwhile, South Korea's central bank said it has no plans to reduce euro assets in its foreign reserves, the world's sixth-largest.
Analysts said the comments from China and Kuwait prompted investors to cover short positions in the euro, which has taken a beating the last few months.
"A lot of this euro rally is due to short-covering given a 'risk on' environment. This is also a relief rally on the back of the Chinese story," said Boris Schlossberg, director of FX research at GFT in New York.
"It's not because investors are more upbeat about the future. I think they are relieved things are not getting any worse and there are no exogenous shocks out there for the time being," he added.
The euro rallied 3.1 percent against the yen to 112.63 yen <EURJPY=R>, pulling away from an 8-1/2-year low of 108.83 yen hit this week.
The dollar <JPY=> rose 1.1 percent to 90.88 yen.
Thin volume conditions ahead of market holidays in Britain and the United States on Monday exacerbated the moves, traders said.
Appetite for risk was also supported by the view that European officials are now taking the right steps to address the regions' debt problems, analysts said.
"The Portuguese debt auction yesterday went well, while the Spanish parliament approved a 15-billion-euro austerity package," said David Watt, senior currency strategist, at RBC Capital Markets in Toronto.
"So we're starting to see some progress in the euro zone and things are getting done. Given that the market is excessively short euros, the general sentiment is that this selling is overdone, and therefore the euro is due for a bounce," Watt added.
Higher-yielding, commodity currencies soared as oil prices climbed. The Australian dollar <AUD=D4> rose 3.5 percent against its U.S. counterpart to US$0.8497 and jumped 4.6 percent versus the yen <AUDJPY=R> to 77.20 yen. (For the Spanish austerity story, double-click on [
])