Moore John P, Kuhlman Brock, Hansen Jeanett, Gomez Leonardo, JØrgensen Bodil, Bartels Dorothea
South African Grape and Wine Research Institute, Department of Viticulture and Oenology, Faculty of AgriSciences, Stellenbosch University, Stellenbosch 7600, South Africa.
Department of Plant and Environmental Sciences, University of Copenhagen, 1871 Copenhagen, Denmark.
Plants (Basel). 2024 Aug 12;13(16):2235. doi: 10.3390/plants13162235.
Vegetative desiccation tolerance has evolved within the genera and . A centre of endemism and diversification for these plants appears to occur in ancient tropical montane rainforests of east Africa in Kenya and Tanzania. , a desiccation-sensitive relative of , occurs in these rainforests and experiences adequate rainfall and thus does not require desiccation tolerance. However, sharing this inselberg habitat, another species, , does retain vegetative desiccation tolerance and is also related to the resurrection plant found in South Africa. Leaf material was collected from all three species at different stages of hydration: fully hydrated (ca. 90% relative water content), half-dry (ca. 45% relative water content) and fully desiccated (ca. 5% relative water content). Cell wall monosaccharide datasets were collected from all three species. Comprehensive microarray polymer profiling (CoMPP) was performed using ca. 27 plant cell-wall-specific antibodies and carbohydrate-binding module probes. Some differences in pectin, xyloglucan and extension epitopes were observed between the selected species. Overall, cell wall compositions were similar, suggesting that wall modifications in response to vegetative desiccation involve subtle cell wall remodelling that is not reflected by the compositional analysis and that the plants and their walls are constitutively protected against desiccation.
营养体耐旱性在[具体属名1]和[具体属名2]属内已经进化形成。这些植物的一个特有性和多样化中心似乎出现在肯尼亚和坦桑尼亚的东非古老热带山地雨林中。[与目标植物有亲缘关系的一种对干燥敏感的植物名称]是这些雨林中的一种，那里降雨充足，因此它不需要耐旱性。然而，另一个物种[物种名称2]也生活在这个孤山栖息地，它确实具有营养体耐旱性，并且也与在南非发现的复苏植物[相关植物名称]有关。在不同水合阶段从这三个物种中采集了叶片材料：完全水合（相对含水量约90%）、半干（相对含水量约45%）和完全干燥（相对含水量约5%）。从这三个物种中收集了细胞壁单糖数据集。使用约27种植物细胞壁特异性抗体和碳水化合物结合模块探针进行了综合微阵列聚合物分析（CoMPP）。在所选择的物种之间观察到果胶、木葡聚糖和伸展蛋白表位存在一些差异。总体而言，细胞壁组成相似，这表明响应营养体干燥的细胞壁修饰涉及细微的细胞壁重塑，而这种重塑在成分分析中并未体现出来，并且这些植物及其细胞壁在结构上受到保护以防干燥。
