* ECB extension of looser funding rules boosts stocks, euro
* Wall Street set for positive open
* Emerging market stocks underperform
By Jeremy Gaunt, European Investment Correspondent
LONDON, March 25 (Reuters) - European shares rose to their highest level in 17 months and the euro recovered from 10-month lows against the dollar as the European Central Bank moved to shore up Greek banks.
Wall Street also looked set for a positive start.
ECB President Jean-Claude Trichet told the European Parliament the bank would keep its current minimum rating threshold for collateral accepted against central bank funds beyond the end of this year.
It will also introduce a system for discounting collateral from January. [
]One key impact of this is that Greek government bonds will remain eligible as collateral next year even if their rating drops a bit.
"It is really important they made this statement today to calm markets that are worried about the Greek situation," said James Nixon, economist at Societe Generale.
The euro was up 0.4 percent at $1.3361 <EUR=>, having earlier fallen to a 10-month low of $1.3285.
Investors remain highly concerned about stability in the euro zone on the back of the ongoing Greek troubles and Wednesday's downgrade of Portuguese debt.
Diplomatic efforts continued ahead of a European Union summit to start on Thursday after they failed on Wednesday to bridge differences over whether to offer a safety net to Greece. [
]The euro has been punished by uncertainty engendered by what comes down to a fight about whether one euro zone country should bail out another.
Dubai's debt issues were also in focus again after the emirate's government said it would support the restructuring of debt-laden state-owned firm Dubai World and its Nakheel subsidiary by providing $9.5 billion in new funding.
Euro zone government bond prices were slightly lower, catching up with moves in the U.S. Treasury market which sold off late the previous session after poor demand in a five-year note auction.
EMERGING UNDERPERFORMANCE
European shares climbed, led by banks. The pan-European FTSEurofirst 300 <
> index of top shares was up 0.7 percent.This helped lift MSCI's all-country world index <.MIWD00000PUS> into positive territory for the day, but emerging market shares <.MSCIEF> were slightly lower, weighing on the index.
Despite being cited as a favourite by institutional investors, emerging market shares have underperformed this year and the MSCI benchmark is barely in positive territory.
Some investors may be pulling back because of concerns that too much money is chasing too few assets could create a short-term bubble. [
]Earlier, Japan's Nikkei closed up 0.02 percent <
>.(To read Reuters Global Investing Blog click on http://blogs.reuters.com/globalinvesting; for the MacroScope Blog click on http://blogs.reuters.com/macroscope)
(editing by John Stonestreet)