A barrier to radial oxygen loss helps the root system cope with waterlogging-induced hypoxia

• DOI: 10.1270/jsbbs.20110
• Publication Date: 2021-01-29T22:08:13Z
• Authors: Masato Ejiri; Takeshi Fukao; Tomoki Miyashita; Katsuhiro Shiono
• Keywords: Aerenchyma; Suberin; Waterlogging (archaeology); Hypoxia; Oxygen transport; Root system

Internal aeration is crucial for root growth under waterlogged conditions. Many wetland plants have a structural barrier that impedes oxygen leakage from the basal part of roots called radial loss (ROL) barrier. ROL barriers reduce transported via aerenchyma to tips, enabling long-distance transport cell respiration at tip. Because tip does not an barrier, some transferred released into soil, where it oxidizes and detoxifies toxic substances (e.g., sulfate Fe2+) around are located outer (OPRs). Their main component thought be suberin. Suberin deposits may block entry potentially compounds in highly reduced soils. The amount depends on strength length roots, environmental conditions, which causes spatiotemporal changes system's oxidization pattern. We summarize recent achievements understanding how formation regulated discuss opportunities breeding waterlogging-tolerant crops.