Edelmann Hans Georg
Universitat zu Koeln, Biologiedidaktik, Cologne, Germany.
Protoplasma. 2018 Nov;255(6):1877-1881. doi: 10.1007/s00709-018-1272-7. Epub 2018 Jun 11.
Land plants perceive gravity and respond to it in an organ-specific way; shoots typically direct growth upwards, roots typically downwards. Historically, at least with respect to maize plants, this phenomenon is attributed to three sequential processes, namely graviperception, the transduction of the perceived signal, and the graviresponse, resulting in a typical (re)positioning of the organ or entire plant body relative to the gravivector. For decades, sedimentation of starch-containing plastids within the cells of special tissues has been regarded as the primary and initiating process fundamental for gravitropic growth (starch-statolith hypothesis). Based on Popper's falsification principle, uncompromising experiments were executed. The results indicate that the model of graviperception based on amyloplast sedimentation does not apply to maize seedlings.
陆生植物能够感知重力并以器官特异性的方式对其做出反应；地上部分通常向上生长，而根部通常向下生长。从历史上看，至少就玉米植株而言，这种现象归因于三个连续的过程，即重力感知、感知信号的转导以及重力反应，从而导致器官或整个植物体相对于重力矢量进行典型的（重新）定位。几十年来，特殊组织细胞内含有淀粉的质体沉降一直被视为向重力性生长的首要和起始基本过程（淀粉平衡石假说）。基于波普尔的证伪原则，进行了毫不妥协的实验。结果表明，基于淀粉体沉降的重力感知模型不适用于玉米幼苗。
