Opposition leader Aung San Suu Kyi has been sworn in to Burma's military-backed parliament, taking public office for the first time since launching her struggle against authoritarian rule nearly a quarter-century ago.   

The 66-year-old opposition leader's entry into the legislature heralds a new political era in Burma, also known as Myanmar, cementing a risky detente between her party and the reformist government of President Thein Sein, which inherited power from the army last year.   

Suu Kyi's National League for Democracy party will occupy too few seats to have any real power in the ruling-party dominated assembly, however, and there are fears the presence of the opposition lawmakers could simply legitimize the regime without any change.   

But the new legislators are also likely to bring a level of public debate to the legislative body that has never been seen as they prepare for the next general election in 2015.   

The swearing-in ceremony took place in the capital, Naypyidaw, which was built by the former army junta. With white roses in her hair, Suu Kyi stood along with several dozen of her party's representatives as the Speaker the lower house asked them to read the oath.

From house arrest to parliament  

Suu Kyi's ascent marks an astonishing reversal of fortune for a woman who became one of the world's most prominent prisoners of conscience, held under house arrest for much of the last two decades.

When the 1991 Nobel Peace Prize winner was finally released in late 2010, just after a vote her party boycotted that was deemed neither free nor fair, few could have imagined she would make the leap from democracy advocate to elected official in less than 18 months.   

But the road has not been easy. This week, Suu Kyi backed down in a dispute over the oath of office which, had it persisted, could have spiraled into another major crisis.   

Suu Kyi and her colleagues had refused to join parliament when the latest session began April 23 because they object to phrasing in the oath that obligates them to "safeguard the constitution." They want the word "safeguard" changed to "respect," and have vowed to work to change the constitution because it was drafted under military rule.   

But on Monday, Suu Kyi abruptly changed course, saying: "Politics is an issue of give and take. We are not giving up, we are just yielding to the aspirations of the people."   

The party's failure to take their seats had irked some of Suu Kyi's backers, who were eager to see the woman who has stood up to Burma's military for 23 years finally hold office.