植物中的水运输服从穆雷定律
Katherine A McCulloh1, John S Sperry, Frederick R Adler
1Department of Biology, University of Utah, Salt Lake City, Utah 84112, USA. mcculloh@biology.utah.edu
Nature
|February 28, 2003
概括
植物通过在底部使用更少的宽树叶管道来优化水运输,在远部分支成更窄的管道,与以前的模型不同. 这将最大限度地提高液压导电量,以实现高效的光合作用.
科学领域:
- 植物生理学 植物生理学
- 水力运输是指水力运输.
- 生物力学 生物力学
背景情况:
- 植物水运输对于光合作用和生存至关重要.
- 最佳设计旨在最大限度地提高给定投资运输组织的液压导电性.
- 管道模型和达芬奇规则等现有模型不能完全解释最佳的植物水运输.
研究的目的:
- 研究植物水运输系统的最佳设计.
- 为了确定植物如何最大限度地提高液压导电.
- 将模拟结果与既有模型和生物数据进行比较.
主要方法:
- 在分支运输系统中对液压导电的计算机模拟.
- 穆雷定律的应用,最初来自心血管研究.
- 测量植物质管道尺寸.
主要成果:
- 最佳的网络设计在底部具有最小数量的宽管道,在远端逐渐缩小到许多更窄的管道.
- 这种设计不同于管道模型和达芬奇规则,管道尺寸在各个分支行列中都是恒定的.
- 植物体测量与穆雷定律的预测一致,当体不同时发挥结构支功能时.
结论:
- 工厂的水运输系统通过逐渐缩小的网络设计来实现最佳的液压导电性,符合穆雷定律.
- 这一发现挑战了植物形状和水运输的传统模型.
- 体的双重功能 (运输和支持) 可以影响对最佳液压设计的坚持.
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