Dace Halford Jw, Adetunji Ademola E, Moore John P, Farrant Jill M, Hilhorst Henk Wm
Laboratory of Plant Physiology, Wageningen University and Research, The Netherlands.
Department of Molecular and Cell Biology, University of Cape Town, South Africa.
Curr Opin Plant Biol. 2023 Oct;75:102410. doi: 10.1016/j.pbi.2023.102410. Epub 2023 Jul 5.
The survival of extreme water deficit stress by tolerant organisms requires a coordinated series of responses, including those at cellular, transcriptional, translational and metabolic levels. Small molecules play a pivotal role in creating the proper chemical environment for the preservation of cellular integrity and homeostasis during dehydration. This review surveys recent insights in the importance of primary and specialised metabolites in the response to drying of angiosperms with vegetative desiccation tolerance, i.e. the ability to survive near total loss of water. Important metabolites include sugars such as sucrose, trehalose and raffinose family of oligosaccharides, amino acids and organic acids, as well as antioxidants, representing a common core mechanism of desiccation tolerance. Additional metabolites are discussed in the context of species specificity and adaptation.
耐受性生物在极端水分亏缺胁迫下的存活需要一系列协调的反应，包括细胞、转录、翻译和代谢水平上的反应。小分子在脱水过程中为维持细胞完整性和内稳态创造合适的化学环境方面起着关键作用。本综述探讨了初级代谢产物和特殊代谢产物在具有营养体脱水耐受性（即在几乎完全失水的情况下存活的能力）的被子植物应对干燥过程中的重要性的最新见解。重要的代谢产物包括蔗糖、海藻糖和棉子糖家族低聚糖等糖类、氨基酸和有机酸，以及抗氧化剂，它们代表了脱水耐受性的共同核心机制。还在物种特异性和适应性的背景下讨论了其他代谢产物。
