SHANGHAI, March 23 (Reuters) - Chinese developer Guangzhou R&F Properties Co is in negotiations with bondholders to extend an onshore bond due on April 7 by a year, three people familiar with the matter said.

R&F Properties planned to repay the bond worth 1.95 billion yuan ($149 million) in stages within a year, according to the sources. It was also planning to pledge two property projects in Nanning and Suzhou.

R&F Properties could not be immediately reached for comment.

Trading of the bond, due on April 7, was suspended by the Shanghai Stock Exchange after it surged 30% on Wednesday.

($1 = 6.3743 Chinese yuan) (Reporting by Steven Bian, Jason Xue and Andrew Galbraith in Shanghai, Shuyan Wang in Beijing and Clare Jim in Hong Kong; Editing by Jacqueline Wong)