Leaf water potential measurements using the pressure chamber: synthetic testing of assumptions towards best practices for precision and accuracy

编号 040034802

推送时间 20220620

研究领域 森林培育 

年份 2022 

类型 期刊 

语种 英语

标题 Leaf water potential measurements using the pressure chamber: synthetic testing of assumptions towards best practices for precision and accuracy

来源期刊 Plant,Cell & Environment

期 第348期

发表时间 20220408

关键词 leaf water potential;  plant water relations;  plant water status;  pressure bomb;  pressure chamber;  water stress; 

摘要 Leaf water potential (ψ leaf), typically measured using the pressure chamber, is the most important metric of plant water status, providing high theoretical value and information content for multiple applications in quantifying critical physiological processes including drought responses. Pressure chamber measurements of ψ leaf (ψ leafPC) are most typical, yet, the practical complexity of the technique and of the underlying theory has led to ambiguous understanding of the conditions to optimize measurements. Consequently, specific techniques and precautions diversified across the global research community, raising questions of reliability and repeatability. Here, we surveyed specific methods of ψ leafPC from multiple laboratories, and synthesized experiments testing common assumptions and practices in ψ leafPC for diverse species: (i) the need for equilibration of previously transpiring leaves; (ii) leaf storage before measurement; (iii) the equilibration of ψ leaf for leaves on bagged branches of a range of dehydration; (iv) the equilibration of ψ leaf across the lamina for bagged leaves, and the accuracy of measuring leaves with artificially “elongated petioles”; (v) the need in ψ leaf measurements for bagging leaves and high humidity within the chamber; (vi) the need to avoid liquid water on leaf surfaces; (vii) the use of “pulse” pressurization versus gradual pressurization; and (viii) variation among experimenters in ψ leafPC determination. Based on our findings we provide a best practice protocol to maximize accuracy, and provide recommendations for ongoing species-specific tests of important assumptions in future studies.

服务人员 孙小满

服务院士 尹伟伦

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