研究组假设土壤物理约束在叶片维管张力的操作范围内驱动收敛。通过对19种植物的meta分析发现，当叶片维管张力达到1.3±0.6兆帕斯卡时，气孔对蒸腾的调节被激活。该值与从最佳土壤水分提取模型预测的范围（1.4±0.6兆帕斯卡）相匹配。植物维管张力的最优性似乎是通过选择在不同环境中生长的不同物种的叶片中一个狭窄的渗透压范围而进化出来的。
据了解，陆生维管植物在负水势下生长，导致维管系统产生水力张力。血管张力随蒸腾作用和土壤干燥而变化，并受叶片表面气孔和压力激活阀的调节。
附：英文原文
Title: Soils drive convergence in the regulation of vascular tension in land plants
Author: Andrea Carminati, Mathieu Javaux, Fabian J.P. Wankmüller, Timothy J. Brodribb
Issue&Volume: 2026-01-29
Abstract: Terrestrial vascular plants operate under negative water potential, which results in hydraulic tension in the vascular system. Vascular tension varies with transpiration and soil drying and is regulated by stomata, pressure-activated valves on the leaf surface. We hypothesize that soil physical constraints drive convergence in the operational range of leaf vascular tension. Based on a meta analysis of 19 diverse species, we find that stomatal regulation of transpiration is activated when leaf vascular tension reaches a narrow target of 1.3 ± 0.6 megapascals. This value matches the range (1.4 ± 0.6 megapascals) predicted from an optimal soil water extraction model. Optimality in plant vascular tension appears to have evolved by selection for a narrow range of osmotic pressure in the leaves of diverse species growing across variable environments.
DOI: adx8114
Source: https://www.science.org/doi/10.1126/science.adx8114