Pouliquen O, Forterre Y, Bérut A, Chauvet H, Bizet F, Legué V, Moulia B
Aix Marseille University, CNRS, IUSTI, Marseille, France.
Phys Biol. 2017 May 23;14(3):035005. doi: 10.1088/1478-3975/aa6876.
The detection of gravity plays a fundamental role during the growth and evolution of plants. Although progress has been made in our understanding of the molecular, cellular and physical mechanisms involved in the gravity detection, a coherent scenario consistent with all the observations is still lacking. In this special issue article, we discuss recent experiments showing that the response to inclination of shoots is independent of the gravity intensity, meaning that the gravity sensor detects an inclination and not a force. This result questions some of the commonly accepted hypotheses and leads to propose a new 'position sensor hypothesis'. The implications of this new scenario are discussed in light of the different observations available in the literature.
重力检测在植物的生长和进化过程中起着基础性作用。尽管我们在理解重力检测所涉及的分子、细胞和物理机制方面取得了进展，但仍缺乏一个与所有观察结果相一致的连贯图景。在这篇专题文章中，我们讨论了最近的实验，这些实验表明茎对倾斜的反应与重力强度无关，这意味着重力传感器检测的是倾斜而非力。这一结果对一些普遍接受的假设提出了质疑，并促使我们提出一个新的“位置传感器假说”。我们根据文献中现有的不同观察结果讨论了这一新图景的意义。
