Biology Department, University of Massachusetts, Amherst, MA 01003, USA; Plant Biology Graduate Program, University of Massachusetts, Amherst, MA 01003, USA.
Biology Department, University of Massachusetts, Amherst, MA 01003, USA.
Trends Plant Sci. 2019 Sep;24(9):853-866. doi: 10.1016/j.tplants.2019.05.012. Epub 2019 Jun 26.
To provide physical support for developing structures and to withstand the pressures associated with water and nutrient transport, some cells deposit a secondary cell wall, a rigid matrix of polysaccharide and phenolic biopolymers. The biosynthesis and deposition of these materials and the patterning of secondary wall-forming cells is controlled by a network of transcription factors. However, recent work suggests that this network forms the core of a more complex, multilevel regulatory system. This expanded system includes epigenetic, post-transcriptional, and post-translational regulation, and is coordinated with other pathways controlling primary growth and responses to environmental stimuli. New findings expand the set of transcription factors identified as secondary cell wall regulators and reveal novel regulatory processes that further govern secondary wall biogenesis.
为了为发育中的结构提供物理支撑，并承受与水和营养物质运输相关的压力，一些细胞会沉积次生细胞壁，这是一种由多糖和酚类生物聚合物组成的刚性基质。这些物质的生物合成和沉积以及次生细胞壁形成细胞的模式形成受到转录因子网络的控制。然而，最近的研究表明，该网络构成了一个更为复杂的多层次调控系统的核心。这个扩展的系统包括表观遗传、转录后和翻译后调控，并与控制初生生长和对环境刺激做出反应的其他途径相协调。新的发现扩展了被鉴定为次生细胞壁调节剂的转录因子的集合，并揭示了进一步控制次生细胞壁生物发生的新的调控过程。
