Huang Peixin, Li Zhonghai, Guo Hongwei
Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, National Engineering Research Center for Tree Breeding and Ecological Restoration, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China.
Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education Institutes, Department of Biology, Southern University of Science and Technology, Shenzhen, China.
Front Plant Sci. 2022 Jun 28;13:923136. doi: 10.3389/fpls.2022.923136. eCollection 2022.
Leaf senescence is the last stage of leaf development, manifested by leaf yellowing due to the loss of chlorophyll, along with the degradation of macromolecules and facilitates nutrient translocation from the sink to the source tissues, which is essential for the plants' fitness. Leaf senescence is controlled by a sophisticated genetic network that has been revealed through the study of the molecular mechanisms of hundreds of senescence-associated genes (SAGs), which are involved in multiple layers of regulation. Leaf senescence is primarily regulated by plant age, but also influenced by a variety of factors, including phytohormones and environmental stimuli. Phytohormones, as important signaling molecules in plant, contribute to the onset and progression of leaf senescence. Recently, peptide hormones have been reported to be involved in the regulation of leaf senescence, enriching the significance of signaling molecules in controlling leaf senescence. This review summarizes recent advances in the regulation of leaf senescence by classical and peptide hormones, aiming to better understand the coordinated network of different pathways during leaf senescence.
叶片衰老 是叶片发育的最后阶段，表现为因叶绿素丧失而导致叶片变黄，同时伴随着大分子物质的降解，并促进养分从库组织向源组织的转运，这对植物的适应性至关重要。叶片衰老受一个复杂的遗传网络控制，该网络已通过对数百个衰老相关基因（SAGs）分子机制的研究得以揭示，这些基因参与多层调控。叶片衰老主要受植物年龄调控，但也受到多种因素影响，包括植物激素和环境刺激。植物激素作为植物中的重要信号分子，参与叶片衰老的起始和进程。最近，有报道称肽激素参与叶片衰老的调控，丰富了信号分子在控制叶片衰老中的意义。本综述总结了经典激素和肽激素在叶片衰老调控方面的最新进展，旨在更好地理解叶片衰老过程中不同途径的协调网络。
