Mycorrhizae are endemic in tropical rainforests in Central America,
the Amazon, Africa, SE Asia, etc. Some species of plants are completely
dependent on them, and once the reserves of nutrition in the seed are
used up, growth will completely stop if the roots have not been infected
with mycorrhizae (summarizing some research that did not directly
answer your question, but the environment where these plants grow
might give a hint).
They do not seem to be inhibited by heavy rainfall.
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