geotropism

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长。

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

丛枝丝延伸长部位是丝尖端，其长的向地性是对地心引力的感应，感应的敏感部位也在长丝的尖端。