By Axel Bugge and Andrei Khalip LISBON (Reuters) - Left-wing parties ousted Portugal's ruling centre-right on Tuesday, in the first such move against an elected government since the end of dictatorship in 1974, paving the way for a Socialist-led administration to end years of austerity. The minority government warned that a retreat on austerity could put Portugal on a similar path to Greece while the left celebrated the chance to raise incomes that were cut during the financial crisis, cut taxes and protect social benefits. The prospect of a government backed by the far-left Communists and Left Bloc has rattled investors and prompted fears that a fragile economic recovery could be derailed in a country that exited an international bailout only last year.