Nikkei climbs as techs, trading houses rise

* Nikkei up on short-covering, but resistance near 10,000

* Trading houses gain after commodity prices rise

* Toshiba up after bid for Areva T&D business

TOKYO, Nov 10 (Reuters) - Japan's Nikkei average rose 1.5 percent on Tuesday, buoyed by Wall Street's gains as interest in risk-taking rose, with Mitsubishi Corp (8058.T) and other trading firms up reflecting climbs in oil, gold and other commodities. Toshiba Corp (6502.T) rose nearly 2 percent after it made a solo bid for French nuclear reactor builder Areva's (CEPFi.PA) transmission and distribution (T&D) business. [ID:nL9177274]

The Dow rose to a 13-month high and other Wall Street indexes gained after the Group of 20 pledged to keep aid flowing to the world economy, encouraging investor appetite for risk, but analysts said long-term uncertainty was likely to keep a lid on gains.

"Things are definitely getting brighter for the short term, but over the longer term there's quite a lot of uncertainty that's preventing rises in Japanese stocks," said Hiroichi Nishi, general manager at the equity division of Nikko Cordial Securities.

"Will there be more government bond issuance? Will the yen continue to rise? And what sort of policies can we expect from the government?"

The benchmark Nikkei .N225 gained 142.08 points to 9,951.07, while the broader Topix , which is not as heavily tech-centred, rose 0.9 percent to 878.45.

Analysts said the Nikkei faces resistance at around 10,000, just about where the 25-day moving average comes in, but if it gained upward momentum it could quickly punch through that.

The next key technical level is 10,200, which is where the Nikkei's 75-day moving average comes in, said Kenichi Hirano at Tachibana Securities.

"But buying today is likely to be extremely short-term and mainly limited to short-covering. Making it over 10,000 today is probably pretty difficult," he said.

The dollar was holding steady against the yen at just under 90 yen, with analysts saying any sustained falls below that level were also likely to put a brake on gains. JPY=

But exporters were strong on Wall Street's rise, while chipmakers climbed after gains in their U.S. peers sent the PHLX semiconductor index .SOXX up 3.2 percent.

Chip tester maker Advantest (6857.T) rose 3 percent to 2,040 yen and Tokyo Electron (8035.T) climbed 3.1 percent to 5,010 yen. Nikon (7731.T), which makes steppers, machines used to produce semiconductor chips, rose 3.1 percent to 1,724 yen.

Trading houses advanced after gains in a broad range of commodities on Monday that saw oil rise more than 2 percent on supply disruption and gold hit a record high of $1,110.85 per ounce. Other metals also gained.

Mitsubishi, Japan's largest trading house, rose 1.8 percent to 2,025 yen and Mitsui & Co (8031.T) gained 2.7 percent to 1,200 yen. Itochu Corp (8001.T) rose 2.6 percent to 596 yen. Toshiba had been in talks with Abu Dhabi National Energy Co (Taqa) TAQA.AD to create a consortium to bid for the Areva T&D business, but Taqa pulled out after failing to secure approval from majority owner the Abu Dhabi government, two people familiar with the matter said. Toshiba rose 1.7 percent to 525 yen. (Reporting by Elaine Lies; Editing by Michael Watson)