ByAnjani TrivediandChao Deng 

Government bonds across Asia rallied Wednesday as investors fled to safety with oil and other commodities posting fresh losses, and worries over slowing global growth re-emerging.

Yields, which move inversely to prices, on 10-year benchmark government bonds accelerated their fall, hitting multiyear lows across the region. South Korean 10-year bond yields fell to a fresh record low, while Indonesian and Indian bonds dropped to their lowest in more than a year.

Falling oil and commodity prices, along with spluttering growth weigh on inflation expectations, which have been dropping across Asia. Lower inflation over time makes fixed income securities attractive.

As oil posted fresh lows Tuesday after talk from the United Arab Emirates' oil minister signaled the Organization of the Petroleum Exporting Countries would stand pat on its November decision to keep output steady, the World Bank cut its forecast for global growth to 3.0% in 2015, down from an earlier forecast of 3.4%. The bank lowered its growth forecasts for all developing economies by more than half a percentage point to 4.8%. Oil continued to trade lower in Asia Wednesday.

Bonds in Malaysia, which were suffering from lower oil prices until last week, were at their lowest in over a month. Yields on Malaysian bonds dropped 0.12 percentage points in the last two days, compared with 10-Year U.S. Treasurys, which have dropped 0.03 percentage points over the same time. Still, the Malaysian ringgit traded close to its lowest in over five years.

Copper prices fell to their lowest level in more than five years in line with plummeting crude oil prices in early Asia trade, ignoring relatively steady copper import data from China for the month of December.

The Japanese yen touched its strongest level against the U.S. dollar in more than a month at Yen117.34, from Yen117.92 on Tuesday.

Stocks in Japan and Australia fell Wednesday, but they rose in China, where banks led gains. The Nikkei Stock Average was off by 1.2% while the S&P ASX 200 was down 1.5%. Stocks in Malaysia, one of the few net exporters of oil among Asian countries, were down 0.2%.

The losses tracked a lower close in the U. S.amid shifting views about the European Central Bank's expected stimulus and a monthslong oil-price decline. U.S. crude-oil futures have fallen 5.4% this week alone to $45.74 a barrel.

Japan's market has stalled since early December amid concerns about whether Prime Minister Shinzo Abe's economic program will work in the near term. On Wednesday, the government said it would borrow less than Yen40 trillion ($340 billion) for the first time in seven years to finance spending, as it tries to balance its core budget deficit. It also said it would issue a larger proportion of long-term debt in the fiscal year starting in April.

Stocks in Australia were falling for the third straight trading day, led down by BHP Billiton Ltd. and Rio Tinto Ltd. which each fell 3.8% and 4.6% respectively.

In China, financial stocks led gains, ahead of December data on yuan loans. Analysts are expecting a strong rise--Haitong International for example expects new loans to reach 900 billion yuan, compared with a 800 billion yuan consensus.

China Citic Bank Corp. Ltd. was up 4.0%, Shanghai Pudong Development Bank was up 2.7% and Bank of China Ltd. was up 2.6%. The benchmark Shanghai Composite Index was up 0.2% while the Hang Seng Index gained 0.1%.

Daniel Inman contributed to this article

Write to Anjani Trivedi at anjani.trivedi@wsj.com and Chao Deng at Chao.Deng@wsj.com

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