As far as I know plants do not get cancers per se.
Cancer in animals is due to a mutation in the
programmed cell death of a cell or apoptosis.
There are however things in plants that scientist
will term "cancer-like tissue". This defect is
generally caused by some bacterium, though there
are some wasps whose young secrete "cancer
"Cancers" in plants
are called galls. Crown gall disease is probably
the most well known. The bacterium Agro bacterium
tumefaciens causes the disease.
carries a plasmid (called Ti). This plasmid enters
the infected cell and carries genes which become
inserted in the plant's genome. The genes lead to
uncontrolled growth of the plant cell, and also
cause it to produce and secrete compounds called
opines which the bacteria use as a source of food.
In essence, the bacteria create "plant cancers"
so they can eat! A related species, Agro bacterium
rhizogenes causes the development of galls
consisting of roots (even if present on the stem
of the plant).
Now to really get down to
your question I am afraid I have a pretty cop-out
answer. As far as I know galls are not limited to
certain plants though I have only seen galls on
woody plants (trees and bushes). There are some
wonderful pictures of galls on Wayne Armstrong's
Site (Palomar College).
I hope you find this
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