osmoregulation and proline

[Gandalf the Grey]

	 Next week I will be giving a talk on the many roles of Abscisic 
Acid on plant growth and development.  One of the central themes in which 
ABA is associated with is osmotic stress.  In the review acticles and the 
texts I have read mention that proline is an important osmoprotectant, but 
I can't find out why.  Can anyone help me out with a simple explanation??
I must admit I won't be covering this in my talk, it is more for personal 
interest.  Any input would greatly be appreciated.
		Thanks,
	Joe Boinski
	SUNY at Buffalo