Can I make risotto without wine?

I am a teetotaler and plan to remain that way till death. I am a vegetarian too. So I would use vegetarian or mushroom stock only.

1. 
   

   What is the role of wine in making risotto? Does it help in getting the consistency or does it add flavor?

   
   


2. 
   

   What can I substitute instead to get a comparable flavor?