Auxins influence the growth of stems toward light (phototropism) and against the force of gravity (geotropism).

它可影响茎的向光性和背地性。

The geotropism growth was a response of hypha to gravity and the geotropic sensitive was at the hyphal apex.

枝菌根真菌菌丝延伸部位是菌丝尖端，其的向地性是对地心引的感应，感应的敏感部位也在菌丝的尖端。