Unlike most plants that are able to convert sunlight into energy in a
process called photosynthesis, truffles are instead totally dependent on
certain trees to carry out this process for them. In return, the
truffle helps its host tree by using its hyphae to reach nutrients and
water from pockets of soil that the tree cannot reach by itself.1 This kind of a symbiotic relationship between fungi and the roots of a tree is called mycorrhiza.
https://www.foodunfolded.com/article/how-truffles-are-grown
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