相关实验视频

Updated: Jul 22, 2025

Measurement of Leaf Hydraulic Conductance and Stomatal Conductance and Their Responses to Irradiance and Dehydration Using the Evaporative Flux Method EFM

Measurement of Leaf Hydraulic Conductance and Stomatal Conductance and Their Responses to Irradiance and Dehydration Using the Evaporative Flux Method EFM

Published on: December 31, 2012

葡萄树的前叶水潜力不一定是对土壤水分的良好预测

Thomas Groenveld^1,2, Charles Obiero¹, Yingxue Yu^3,4

¹Department of Viticulture and Enology, Irrigated Agriculture Research and Extension Center, Washington State University, Prosser, WA, USA.

BMC plant biology

|July 24, 2023

概括

在葡萄树的潮湿土壤中,前雨叶水潜力 (Ψpd) 不是土壤水潜力 (Ψsoil) 的可靠代理. 这种假设只能在干燥的土壤条件下成立,这需要在植物水关系研究中仔细考虑.

科学领域:

植物生理学植物生理学
农业科学农业科学
环境科学环境科学

背景情况:

在植物水关系研究中,前叶水潜力 (Ψpd) 通常被用作土壤水潜力 (Ψsoil) 的代理.
这种做法依赖于可以忽略的夜间透气和已建立的水静电平衡的假设,这些假设往往未经测试.

研究的目的:

实证地测试假设,在野外种植的葡萄树中,早晨前的叶子水潜力 (Ψpd) 等于土壤水潜力 (Ψsoil).
为了确定这种假设在葡萄酒水状况评估中有效的条件.

主要方法:

这是一项为期两年的实地试验,涉及美国华盛顿东南部干旱地区的30种葡萄品种.
在干燥周期期间,定期测量采样植物的早晨叶子水潜力 (Ψpd) 和体积土壤含水量 (θv).

主要成果:

在潮湿的土壤中 ( Ψsoil > -0.14 MPa), Ψpd 在所有30种品种中都明显低于 Ψsoil.
在干燥的土壤条件下 ( Ψsoil < -0.14 MPa), Ψpd 的测量与 Ψsoil 的测量更加一致.
观察到特定种类的差异,但在研究年中缺乏一致性.

结论:

假设 Ψpd = Ψsoil 不适用于湿土中的葡萄树.
在葡萄园的干燥土壤条件下, Ψpd = Ψsoil 假设可能适用.
研究结果强调了在使用 Ψpd 作为葡萄藤水状态指标时,土壤湿度条件的重要性.

关键词:

这是一个不平衡的不平衡.模型模型模型模型模型在夜间的透气.土壤水潜在的潜力维蒂斯维蒂斯 (维蒂斯维蒂斯) 是一个

更多相关视频

Semi-High Throughput Screening for Potential Drought-tolerance in Lettuce Lactuca sativa Germplasm Collections

Semi-High Throughput Screening for Potential Drought-tolerance in Lettuce Lactuca sativa Germplasm Collections

Published on: April 17, 2015

A Telemetric, Gravimetric Platform for Real-Time Physiological Phenotyping of Plant–Environment Interactions

A Telemetric, Gravimetric Platform for Real-Time Physiological Phenotyping of Plant–Environment Interactions

Published on: August 5, 2020

相关概念视频

Responses to Drought and Flooding

Responses to Drought and Flooding

Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.

Adaptations that Reduce Water Loss

Adaptations that Reduce Water Loss

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.

Regulation of Transpiration by Stomata

Regulation of Transpiration by Stomata

During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.

Tonicity in Plants

Tonicity in Plants

Tonicity describes the capacity of a cell to lose or gain water. It depends on the quantity of solute that does not penetrate the membrane. Tonicity delimits the magnitude and direction of osmosis and results in three possible scenarios that alter the volume of a cell: hypertonicity, hypotonicity, and isotonicity. Due to differences in structure and physiology, tonicity of plant cells is different from that of animal cells in some scenarios.

Xylem and Transpiration-driven Transport of Resources

Xylem and Transpiration-driven Transport of Resources

The xylem of vascular plants distributes water and dissolved minerals that are taken up by the roots to the rest of the plant. The cells that transport xylem sap are dead upon maturity, and the movement of xylem sap is a passive process.