You'd want to do your homework and make sure your turbine controller's output never exceeds the solar array voltage rating of the MPP, ie the dump load etc is capable of keeping things under control.
Personally I'd avoid the situation and use a wind controller setup that is compatible with your battery's charging requirements and connect both it and the MPP to the battery. Both the MPP and the wind controller would be able to charge the battery directly in this setup so you would have to ensure that the peak current from both does not exceed the recommended rate for your battery.