HONG KONG (Reuters) -China is grappling with a slowdown that has rattled global markets, with the spotlight now focused on troubled developer Country Garden's debt crisis in the property sector, which accounts for roughly a quarter of the economy. On Thursday, Country Garden delayed a deadline for creditors to vote on whether to postpone payments for an onshore 3.9 billion yuan ($537 million) private bond until Friday 1400 GMT, saying it wanted to give bondholders sufficient time to prepare for the vote. The vote is a key hurdle as Country Garden strives to avoid default, with one holder of its dollar bonds saying if the company cannot extend its domestic debt, it will be unable to service external bondholders.