Poovaiah B W, McFadden J J, Reddy A S
Dept of Horticulture and Land. Architecture, Washington State University, Pullman 99164-6414, USA.
Physiol Plant. 1987;71:401-7. doi: 10.1111/j.1399-3054.1987.tb04363.x.
Ca2+ is implicated as a messenger in coupling various environmental stimuli, such as gravity and light, to response. In recent years, it has become evident that Ca2+ plays a central role in all three phases of gravitropism--perception, transduction and response. The root cap, which is known to contain high amounts of Ca2+ and calmodulin, is the primary site of gravity perception. The possible role of phosphoinositide turnover and Ca(2+) - and Ca(2+) -calmodulin-dependent enzymes such as Ca(2+) -ATPase and protein kinases in gravitropism is discussed. A model is proposed to describe the role of Ca2+ in both normal and light-dependent gravity response in roots.
钙离子被认为是一种信使，可将各种环境刺激（如重力和光）与反应相偶联。近年来，越来越明显的是，钙离子在向重力性的所有三个阶段——感知、转导和反应中都起着核心作用。已知根冠含有大量的钙离子和钙调蛋白，是重力感知的主要部位。本文讨论了磷酸肌醇代谢以及钙（2+）和钙（2+）-钙调蛋白依赖性酶（如钙（2+）-ATP酶和蛋白激酶）在向重力性中的可能作用。本文提出了一个模型来描述钙离子在根的正常和光依赖性重力反应中的作用。
