These genetically modified poplar trees were destroyed by activists in 1999

Scientists want to plant hundreds of GM trees for biofuel research despite fears that they could cause 'widespread ecological damage'.

They believe the Government's growing commitment to renewable energy sources may open the door again to controversial GM projects.

The researchers have requested permission to place genetically modified poplars on land owned by the Forestry Commission.

The poplars have been altered to grow faster and make them more suitable for the production of the biofuel ethanol.

But fears that GM trees could damage wildlife mean any schemes involving such planting will face massive opposition.

If approved, the application by scientists from the University of Southampton would be the first attempt to cultivate GM trees in the UK since 1999, when activists destroyed 115 in Berkshire.

Professor Gail Taylor said the time had come to 'move the debate forward on GM trees'.

A spokesman for the Forestry Commission said: 'I'm aware that researchers from the University of Southampton have applied to plant some GM poplar on our land.

'We're still considering their request but haven't given a definitive answer.'

The Department for the Environment, Food and Rural Affairs would have to approve the scheme in order for a licence to be granted.

But opposition to the planting of the trees is likely to be intense. Clare Oxborrow, of Friends of the Earth, said: 'Our concerns with GM trees are even more serious than crops because trees are very long-lived.

'They are inherently geared up for spreading seeds and pollen because of they way they reproduce. There's a huge potential for cross-pollination. It could have a really negative impact and cause widespread ecological damage.'

Scientists believe tree diseases could be tackled through genetic modification.