Björkman T, Leopold A C
Boyce Thompson Institute, Cornell University, Ithaca, New York 14853-1801, USA.
Plant Physiol. 1987;84(3):847-50. doi: 10.1104/pp.84.3.847.
Some characteristics of the gravity sensing mechanism in maize root caps were investigated using a bioelectric current as an indicator of gravity sensing. This technique involves the measurement of a change in the current density which arises at the columella region coincidently with the presentation time. Two inhibitors of auxin transport, triiodobenzoic acid and naphthylphthalamic acid, blocked gravitropic curvature but not the change in current density. Two inhibitors of calmodulin activity, compound 48/80 and calmidazolium, blocked both curvature and gravity-induced current. The results suggest that auxin transport is not a component of gravity sensing in the root cap. By contrast, the results suggest that calmodulin plays an intrinsic role in gravity sensing.
利用生物电流作为重力感应的指标，对玉米根冠重力感应机制的一些特性进行了研究。该技术涉及测量在小柱区域与呈现时间同时出现的电流密度变化。两种生长素运输抑制剂，三碘苯甲酸和萘基邻苯二甲酸，阻断了向重力性弯曲，但没有阻断电流密度的变化。两种钙调蛋白活性抑制剂，化合物48/80和氯丙咪嗪，阻断了弯曲和重力诱导的电流。结果表明，生长素运输不是根冠重力感应的组成部分。相比之下，结果表明钙调蛋白在重力感应中起内在作用。
