Bacteria for Mars Terraforming?

Here's an article I read:

http://www.newscientist.com/news/news.jsp?id=ns99995049

So these ultra-small glacier core bacteria are able to survive very
cold temperatures. Would that in itself make them suitable to thrive
on Mars? Or is Mars short of critical minerals that they might need?

I know that there's a concern that contaminating Mars with earth
bacteria could thwart our search for life there, but shouldn't that
ultimately take a back seat to terraform Mars to turn it into
habitable space for humans to live on? It's not like Mars has some
fantastic ecological richness as it is right now.

What about the lichen which are found on mountaintops? Could they be
adapted for Mars?

I'm imagining that we'd at least need solar concentrator domes, to
make local oases in the barren Martian landscape.