Wire for greenhouse racks?

[Polarizeme]

We will be building our greenhouse over the next 2 weeks. One of the things we were concerned with is the wire for the shelves/racks we are going to be building.

Is galvanized wire a worry? Will it harm the plants? We were looking at basic 1x1 or 1x2 fencing wire. This is a heavy duty farm wire for pens, etc.

If this isn't a good wire, then what should I use?