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

它可影向光性和背地性生长。

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

丛枝菌根真菌菌丝伸生长部位是菌丝尖端，其生长向地性是对地心引感应，感应敏感部位也在生长菌丝尖端。