Plant Biology Division, The Samuel Roberts Noble Foundation, Ardmore, Oklahoma 73401, USA.
Nat Plants. 2016 Oct 17;2(11):16155. doi: 10.1038/nplants.2016.155.
Plants are capable of orienting their root growth towards gravity in a process termed gravitropism, which is necessary for roots to grow into soil, for water and nutrient acquisition and to anchor plants. Here we show that root gravitropism depends on the novel protein, NEGATIVE GRAVITROPIC RESPONSE OF ROOTS (NGR). In both Medicago truncatula and Arabidopsis thaliana, loss of NGR reverses the direction of root gravitropism, resulting in roots growing upward.
植物能够在一个被称为向重力性的过程中，使它们的根朝着重力的方向生长，这对于根向土壤中生长、获取水分和养分以及固定植物是必要的。在这里，我们表明根的向重力性依赖于一种新的蛋白质，根的负向重力反应蛋白（NGR）。在蒺藜苜蓿和拟南芥中，NGR 的缺失会改变根的向重力性方向，导致根向上生长。
