MOSCOW (Reuters) - Russia's minister for culture had a long conversation with the Bolshoi Theatre before it announced it was postponing the world premiere of Nureyev, a ballet about the famous Russian dancer, the TASS news agency reported on Monday.

The long awaited premiere of the ballet about Rudolf Nureyev, one of the first Soviet artists to defect to the West, was due to be held on July 11, but the Bolshoi said on its website late on Saturday it would not take place.

Vladimir Urin, the theatre's director general, told a news conference on Monday it had been pulled because rehearsals had shown it was not ready. He said it would be staged in May next year instead.

However, TASS cited a spokeswoman for Vladimir Medinsky, the culture minister, as saying he had spoken to the theater about Nureyev.

"Yes there was a long conversation with Urin," TASS cited Irina Kaznacheeva, the spokeswoman, as saying. "But a ban is the not the ministry's working style." She said she did not know details of the conversation.

However, TASS cited a source close to the culture ministry as saying the production had been postponed because Medinsky had been concerned it violated a law designed to prevent the promotion of homosexuality to minors.

Under the legislation, which the European Court of Human Rights ruled last month breached European treaty rules, any event or act regarded by the authorities as an attempt to promote homosexuality to minors is illegal and punishable by a fine.

The law has been used to stop gay pride marches and to detain gay rights activists.

The postponement has caused a scandal in Moscow.

The Bolshoi, which was founded in 1776, was last embroiled in controversy in 2013 when its then artistic director, Sergei Filin, had acid thrown in his face in an episode which lifted the lid on poisonous rivalries over roles, money and power at one of Russia's most prominent cultural institutions.

(Reporting by Andrew Osborn; Editing by Alexander Winning)