Larry is correct, the roots are usually inevitably damaged so can't provide as much water to the leaves as they used to. Something like 90% of a plant's water needs are for transpiration. When leaves wilt because there isn't enough water then the leaves can no longer photosynthesize so they are not performing their usual function in any case. If you shorten the leaves then they don't need as much water and they will, in my experience, handle the move better.
