Mendel Centre for Plant Genomics and Proteomics, Central European Institute of Technology (CEITEC), Masaryk University, Brno, Czech Republic.
Plant Cell Environ. 2017 Nov;40(11):2586-2605. doi: 10.1111/pce.13021. Epub 2017 Sep 11.
To maintain the activity of meristems is an absolute requirement for plant growth and development, and the role of the plant hormones auxin and cytokinin in apical meristem function is well established. Only little attention has been given, however, to the function of the reactive oxygen species (ROS) gradient along meristematic tissues and its interplay with hormonal regulatory networks. The interdependency between auxin-related, cytokinin-related and ROS-related circuits controls primary growth and development while modulating plant morphology in response to detrimental environmental factors. Because ROS interaction with redox-active compounds significantly affects the cellular redox gradient, the latter constitutes an interface for crosstalk between hormone and ROS signalling pathways. This review focuses on the mechanisms underlying ROS-dependent interactions with redox and hormonal components in shoot and root apical meristems which are crucial for meristems maintenance when plants are exposed to environmental hardships. We also emphasize the importance of cell type and the subcellular compartmentalization of ROS and redox networks to obtain a holistic understanding of how apical meristems adapt to stress.
维持分生组织的活性是植物生长和发育的绝对要求，植物激素生长素和细胞分裂素在顶端分生组织功能中的作用已得到充分证实。然而，人们对沿分生组织组织的活性氧（ROS）梯度及其与激素调节网络的相互作用的功能关注甚少。生长素相关、细胞分裂素相关和 ROS 相关回路之间的相互依赖性控制着初级生长和发育，同时调节植物形态以应对有害的环境因素。因为 ROS 与氧化还原活性化合物的相互作用会显著影响细胞的氧化还原梯度，所以后者构成了激素和 ROS 信号通路之间串扰的接口。本综述重点介绍了 ROS 与地上部和根部顶端分生组织中的氧化还原和激素成分之间的依赖相互作用的机制，这些机制对于植物在暴露于环境困难时维持分生组织至关重要。我们还强调了细胞类型和 ROS 和氧化还原网络的亚细胞区室化的重要性，以全面了解顶端分生组织如何适应应激。
