Some mycorrhizal fungi help their host tree in other ways too, secreting a tree hormone that causes the roots to grow new root tips, and a hormone that increases the longevity of these new roots.

• 有些菌根真菌也在其他方面帮助它们的宿主树，分泌一种能够促使树根长出新根尖的树木荷尔蒙，以及增加这些新根尖寿命的荷尔蒙。