* Dollar/yen hits 8-1/2-month low, fails to breach key level
* Dollar claws back but retains negative bias
* Aussie, kiwi, CAD gain; focus on U.S. earnings season
(Adds comment, details, updates prices)
By Naomi Tajitsu
LONDON, Oct 7 (Reuters) - The yen rose broadly on Wednesday, hitting an 8 1/2-month high against the dollar as market players probed how far Japanese authorities would allow the yen to rise.
The dollar later trimmed losses as the yen was unable to break through key resistance. But the U.S. currency lost out against most of its rivals, with traders taking bets on an improving global economy by buying commodity-linked currencies.
The yen rallied to 88.01 yen, according to trading platform EBS, its highest since late January.
"I suspect the market wants to see how far it can push the new Japanese administration who have been sending mixed messages on its attitude towards yen strength," said Daragh Maher, deputy head of forex strategy at Calyon.
By 1106 GMT, the dollar had fallen 0.8 percent against the yen to hit its lowest level since late January, before clawing back to trade at 88.65 yen, unchanged on the day.
The yen's inability to appreciate beyond 88.00 yen, where margin calls and options barriers lurked, had prompted a recovery in the U.S. currency. A sustained fall under that level was seen opening the door to a slide to 87.10 yen, a level hit in January for the first time since mid-1995.
Sterling <GBPJPY=R> fell as much as 1 percent to 139.74 yen, approaching a 5 1/2-month low. The euro <EURJPY=R> fell 0.8 percent to 129.59 yen, around its 200-day moving average. Stop-loss sales were seen below 129 yen, traders said.
Japanese Finance Minister Hirohisa Fujii said on Wednesday he was quietly watching currency moves for now, but added authorities may take some steps if moves become abnormal.
He added expectations for low U.S. interest rates were behind dollar weakness and recent moves stemmed from a falling dollar rather than yen or euro strength.
Fujii was earlier quoted as saying in a interview with the Wall Street Journal, published on Wednesday, that the current level of the yen was consistent with acceptable market activity.
COMMODITY FX RALLIES
The euro was little changed on the day at $1.4695 <EUR=> but stayed in sight of near two-week highs touched on Tuesday.
The dollar remained under selling pressure as risk sentiment improved on the back of a 0.2 percent rise in U.S. stock futures, while European shares <
> bobbed in and out of positive territory.Strength in stocks, a rally in gold, which hit a record high around $1,050 on Wednesday, and higher oil prices helped stoke demand for currencies linked to commodity prices, including the Australian, Canadian and New Zealand dollars.
The Australian dollar <AUD=D4> rose to $0.8951, its highest since early August 2008, with an Australian interest rate hike on Wenesday also providing support.
The New Zealand dollar <NZD=D4> also hit a 14-month peak of $0.7399 ans the Canadian dollar touched a 1-year high of C$1.0526 <CAD=>.
"We're seeing a continuation from yesterday's trade, when the Aussie rose after the RBA rate rise," said Naeem Wahid, currency strategist at Bank of Scotland Treasury in London.
"Growth-sensitive assets seem to getting a kick higher as equities are rallying .. Commodity currencies like the kiwi and CAD are also well bid."
The dollar index was flat at 76.375 <.DXY>, holding above a 13-month low of 75.827 hit last month.
Market players were looking to U.S. earnings results later in the day, especially at aluminium producer Alcoa Inc, for evidence of the strength of corporate recovery.
On Thursday, the European Central Bank and the Bank of England will end their monthly policy meetings. Both are expected to hold rates steady, and focus will be on whether they offer any hints into the outlook for quantitative easing.
(Additional reporting by Tamawa Desai and Jamie McGeever, editing by Nigel Stephenson)