March 23 (Reuters) - Wall Street's main indexes opened

higher on Monday as risk appetite returned to markets after U.S.

President Donald Trump said he would order the military to

postpone strikes against Iranian power plants and energy

infrastructure.

The Dow Jones Industrial Average rose 226.3 points,

or 0.50%, at the open to 45,803.82. The S&P 500 rose 68.5

points, or 1.05%, at the open to 6,574.96​, while the Nasdaq

Composite rose 348.2 points, or 1.61%, to 21,995.78 at

the opening bell.