Gyure D C, Bottger B, Gamow R I
J Gen Physiol. 1984 Nov;84(5):727-38. doi: 10.1085/jgp.84.5.727.
Stage IVb sporangiophores of Phycomyces grow into the wind--the anemotropic response--and away from gravity--the geotropic response. A procedure has been designed to measure the equilibrium bend angle that results when the two stimuli are given simultaneously over a long period of time. This angle will be referred to as the anemogeotropic equilibrium angle. This measurement of a sensory response is analogous to the photogeotropic equilibrium angle in which the variable stimulus is light instead of wind. We have found that the anemogeotropic angle, measured relative to the vertical, increases with both increasing wind speed and increasing relative humidity of the wind stimulus. This finding is new and argues against a major prediction of the mass transfer model that anemogeotropism and relative humidity are inversely related. Data from these anemogeotropic experiments further suggest that the self-emitted gas responsible for both the anemotropic response and the avoidance response is water.
根霉属真菌的IVb期孢子囊梗朝着风向生长——即向风性反应——并背离重力方向生长——即负向地性反应。已设计出一种程序来测量当长时间同时给予这两种刺激时所产生的平衡弯曲角度。这个角度将被称为向风负地性平衡角。这种对感官反应的测量类似于光负地性平衡角，其中可变刺激是光而不是风。我们发现，相对于垂直方向测量的向风负地性角度，会随着风速的增加以及风刺激相对湿度的增加而增大。这一发现是全新的，并且与传质模型的一个主要预测相矛盾，该预测认为向风负地性与相对湿度呈负相关。来自这些向风负地性实验的数据进一步表明，负责向风性反应和回避反应的自身释放气体是水。
