Aug 26 (Reuters) - Wall Street's main indexes opened

slightly lower on Tuesday, pressured by a rise in longer-dated

Treasury bond yields after U.S. President Donald Trump's

decision to fire a Federal Reserve governor renewed concerns

about the central bank's independence.

The Dow Jones Industrial Average fell 45.6 points, or

0.10%, at the open to 45,236.83. The S&P 500 fell 3.8

points, or 0.06%, at the open to 6,435.49​, while the Nasdaq

Composite dropped 5.7 points, or 0.03%, to 21,443.631 at

the opening bell.

(Reporting by Sanchayaita Roy in Bengaluru; Editing by Devika

Syamnath)