使用标准方法获得的茎水潜力测量在番茄和葡萄藤极度干旱下分歧
Celia M Rodriguez-Dominguez1, Madeline R Carins-Murphy2, Jaime Sebastian-Azcona1
1Plant Ecophysiology and Irrigation (ECOVER) Group, IRNAS-CSIC, Avda. Reina Mercedes 10, 41012, Sevilla, Spain.
Plant physiology
|November 15, 2025
概括
精确地测量工厂的水状况至关重要. 使用压力室用于茎水潜力 (ψstem) 可能是不准确的靠近致命的门由于叶子损伤,而不是直接的心理测量方法.
科学领域:
- 植物生理学 植物生理学
- 植物水关系 植物水关系
- 植物压力生理学 植物压力生理学
背景情况:
- 茎水潜力 (ψstem) 是植物水状况的关键指标,对于理解对水的可用性生理反应至关重要.
- 压力室通常用于通过评估平衡的叶子水潜力,假设液压连接和透气停止来间接测量 ψstem.
- 如果在脱水过程中发生叶子组织损伤,如树叶化,可能会出现不准确的情况,从而损害压力室测量的可靠性.
研究的目的:
- 为了调查间接 (压力室) 和直接 (心理测量) 测量脱水压力下的茎水潜力 (ψstem) 之间的差异.
- 为了评估叶子组织损伤和树叶腔层空洞化对压力室衍生的 ψstem 值准确性的影响.
- 探讨叶子西汁的透潜力 (ψπ-sap) 作为脱水引起损伤的指标的实用性.
主要方法:
- 进行了两项案例研究:在白天循环下脱水的整个西红植物和在实验室条件下脱水的葡萄树枝.
- 使用心理测量仪 (ψstem-PSY) 直接测量了树干水的潜力.
- 使用压力室测量了平衡的叶子水电位 (ψleaf-eq),并分析了叶子树脂液的透电位 (ψπ-sap).
主要成果:
- 在压力室和心理测量测量之间观察到很大的差异,当pstem接近叶子半菌的致命值时.
- 与预期相反,间接的 ψstem 值 (ψleaf-eq) 仍然高于直接的 ψstem-PSY 测量,一旦叶子树叶功能显著受损.
- 在这两种物种中都始终观察到叶子液透潜能 (ψπ-sap) 的下降,这表明被破坏的叶子细胞含量有助于测量潜力.
结论:
- 建议在使用压力室时小心,以测量番茄和葡萄树的茎水潜力,在可能导致叶子组织损伤的水潜力时小心.
- 直接的心理测量测量可以在严重脱水条件下更准确地评估pstem.
- 叶子西汁的提取和透潜力的测量提供了一种潜在的方法,以接近诱导组织损伤的临界脱水水平.
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