Department of Plant Physiology, Biological Faculty, Lomonosov Moscow State University, 119991 Moscow, Russia.
Int J Mol Sci. 2020 Dec 13;21(24):9476. doi: 10.3390/ijms21249476.
Pollen grain is a unique haploid organism characterized by two key physiological processes: activation of metabolism upon exiting dormancy and polar tube growth. In gymnosperms and flowering plants, these processes occur in different time frames and exhibit important features; identification of similarities and differences is still in the active phase. In angiosperms, the growth of male gametophyte is directed and controlled by its microenvironment, while in gymnosperms it is relatively autonomous. Recent reviews have detailed aspects of interaction between angiosperm female tissues and pollen such as interactions between peptides and their receptors; however, accumulated evidence suggests low-molecular communication, in particular, through ion exchange and ROS production, equally important for polar growth as well as for pollen germination. Recently, it became clear that ROS and ionic currents form a single regulatory module, since ROS production and the activity of ion transport systems are closely interrelated and form a feedback loop.
花粉粒是一种独特的单倍体生物，其特征在于两个关键的生理过程：休眠后新陈代谢的激活和极性管的生长。在裸子植物和开花植物中，这些过程发生在不同的时间框架内，并表现出重要的特征；识别相似性和差异性仍处于活跃阶段。在被子植物中，雄性配子体的生长受到其微环境的定向和控制，而在裸子植物中则相对自主。最近的综述详细介绍了被子植物雌性组织与花粉之间的相互作用，例如肽及其受体之间的相互作用；然而，积累的证据表明，低分子通讯，特别是通过离子交换和 ROS 的产生，对于极性生长以及花粉萌发同样重要。最近，人们清楚地认识到 ROS 和离子电流形成一个单一的调节模块，因为 ROS 的产生和离子运输系统的活性密切相关，并形成一个反馈回路。
