Plant cuticles repress organ initiation and development during skotomorphogenesis in Arabidopsis

• DOI: 10.1016/j.xplc.2024.100850
• Publication Date: 2024-02-25T23:04:32Z
• Authors: Yuru Ma; Wenwen Chang; Yongpeng Li; Jiahui Xu; Yongli Song; Xinmiao Yao; Lei Wang; Yu Sun; Lin Guo; Hao Zhang; Xigang Liu
• Keywords: Photomorphogenesis; Cutin; Cuticle (hair); Epidermis (zoology); Apical dominance

After germination in the dark, plants produce a shoot apical hook and closed cotyledons to protect quiescent meristem (SAM), which is critical for seedling survival during skotomorphogenesis. The factors that coordinate these processes, particularly SAM repression, remain enigmatic. Plant cuticles, multilayered structures of lipid components on outermost surface aerial epidermis all land plants, provide protection against desiccation external environmental stresses. Whether how cuticles regulate plant development are still unclear. Here, we demonstrate mutants BODYGUARD1 (BDG1) long-chain acyl-CoA synthetase2 (LACS2), key genes involved cutin biosynthesis, short hypocotyl with an opened activated Light signaling represses expression BDG1 LACS2, as well biosynthesis. Transcriptome analysis revealed skotomorphogenesis, function chloroplasts. Genetic molecular analyses showed decreased HOOKLESS1 results opening mutants. When hypoxia-induced LITTLE ZIPPER2 at promotes organ initiation mutants, de-repressed cell-cycle cytokinin response induce growth true leaves. Our reveal previously unrecognized developmental functions cuticle skotomorphogenesis mechanism by light initiates photomorphogenesis through dynamic regulation synthesis coordinated systemic changes skotomorphogenesis-to-photomorphogenesis transition.