温度诱导的卵泡自密封能力。
Temperature-induced self-sealing capability of follicles.
机构信息
Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Research Campus Golm, 14424 Potsdam, Germany
Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Research Campus Golm, 14424 Potsdam, Germany.
出版信息
J R Soc Interface. 2018 Jun;15(143). doi: 10.1098/rsif.2018.0190.
Many plants in fire-prone regions retain their seeds in woody fruits in the plant canopy until the passage of a fire causes the fruit to open and release the seeds. To enable this function, suitable tissues are required that effectively store and protect seeds until they are released. Here, we show that three different species of the Australian genus incorporate waxes at the interface of the two valves of the follicle enclosing the seeds, which melt between 45°C and 55°C. Since the melting temperature of the waxes is lower than the opening temperatures of the follicles in all investigated species (, , ), we propose that melting of these waxes allows the sealing of micro-fissures at the interface of the two valves while they are still closed. Such a self-sealing mechanism likely contributes to the structural integrity of the seed pods, and benefits seed viability and persistence during storage on the plants. Furthermore, we show in a simplified, bioinspired model system that temperature treatments seal artificially applied surface cuts and restore the barrier properties.
许多在火灾多发地区的植物会将种子保留在植物树冠的木质果实中，直到一场火灾使果实开裂并释放种子。为了实现这个功能，需要有合适的组织来有效地储存和保护种子，直到它们被释放。在这里，我们表明，澳大利亚属的三个不同物种在包裹种子的滤泡的两个瓣膜的界面处包含蜡，当温度在 45°C 到 55°C 之间时，这些蜡会融化。由于在所有研究的物种中（，，），蜡的熔点都低于滤泡的开口温度，因此我们提出，这些蜡的融化可以在两个瓣膜仍然关闭的情况下，允许微裂缝在界面处的密封。这种自密封机制可能有助于豆荚的结构完整性，并有利于种子在储存过程中的活力和持久性。此外，我们在一个简化的、仿生模型系统中表明，温度处理可以密封人工施加的表面切口，并恢复阻隔性能。
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