CIBIO-Research Center in Biodiversity and Genetic Resources, Department of Biology of the Faculty of Sciences, University of Porto, Portugal.
Natural Resources Institute Finland (Luke), Helsinki, Finland.
Curr Opin Plant Biol. 2020 Feb;53:10-14. doi: 10.1016/j.pbi.2019.08.008. Epub 2019 Oct 5.
The periderm acts as the first line of defence for a plant, protecting wood and phloem from abiotic and biotic stresses. During secondary growth, through the increase in girth of plant organs, the periderm replaces the epidermis as the outermost tissue. The phellogen, a bifacial post-embryonic meristem, forms the phelloderm inwards (toward the vasculature) and the suberized phellem outwards (toward the environment). These three tissues are collectively referred to as the periderm. Here, we summarize recent findings on the molecular mechanisms of periderm development by describing periderm formation in connection to the fate of the surrounding tissues, by discussing common regulatory hubs between the vascular cambium and the phellogen, and by highlighting transcription factors (TFs) controlling phellem differentiation.
周皮是植物的第一道防线，保护木质部和韧皮部免受非生物和生物胁迫。在次生生长过程中，随着植物器官周长的增加，周皮取代表皮成为最外层组织。栓形成层，一种双面胚胎后分生组织，向内（朝向维管束）形成栓内层，向外（朝向环境）形成栓质化的木栓层。这三种组织统称为周皮。在这里，我们通过描述与周围组织命运相关的周皮形成，讨论维管形成层和栓形成层之间的共同调节枢纽，并强调控制木栓层分化的转录因子（TFs），总结了周皮发育的分子机制的最新发现。
