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

它可影响茎的和背地生长。

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

丛枝真丝延伸生长部丝尖端，其生长的地对地心引力的感应，感应的敏感部也在生长丝的尖端。