UPDATE 2-Brazil's Rousseff pledges unity gov't as impeachment momentum grows
(Adds PSD declaring will vote to impeach Rousseff, stock market close)
By Anthony Boadle and Maria Carolina Marcello
BRASILIA, April 13 (Reuters) - Brazil's President Dilma Rousseff pledged on Wednesday to form a government of national unity if she survives an impeachment vote in Congress this weekend, but the odds of that lengthened as allies continued to desert her.
A stream of defections from Rousseff's coalition makes it increasingly likely she will lose Sunday's ballot in the lower house of Congress on whether she should face trial in the Senate over accusations she broke budget laws.
Politicians have begun to flock this week to the residence of the man who would replace Rousseff if she is convicted, Vice President Michel Temer, to declare their support for him, his aides said.
Business leaders have also come out in support of Temer who promises market-friendly policies and less government intervention to boost the world's seventh largest economy, hit by its worst downturn since the Great Depression of the 1930s.
In a major blow for Rousseff, the largest centrist party remaining in the government's coalition, the Social Democratic Party (PSD), instructed its members to vote for the president's impeachment.
The party's leader in the lower house, Rogerio Rosso, told reporters on Wednesday evening the vast majority of the PSD's 38 deputies support Rousseff's ouster.
The move comes on the heels of the defection on Tuesday of another crucial ally, the centrist Progressive Party, or PP. The party, with 49 members in the lower house, left her government and pulled its one minister from her cabinet. Continuación...