Spectral ecophysiology: hyperspectral pressure–volume curves to estimate leaf turgor loss

• DOI: 10.1111/nph.19669
• Publication Date: 2024-03-14T09:18:37Z
• Authors: Raiza Castillo‐Ar...; Gerard Sapes; Nicole Mallen; Alston Lippert; Grace P. John; Alina Zare; William M. Hammond
• Keywords: Turgor pressure; Ecophysiology

Summary Turgor loss point (TLP) is an important proxy for plant drought tolerance, species habitat suitability, and drought‐induced mortality risk. Thus, TLP serves as a critical tool evaluating climate change impacts on plants, making it imperative to develop high‐throughput in situ methods measure TLP. We developed hyperspectral pressure–volume curves (PV curves) estimate using leaf spectral reflectance. used partial least square regression models water potential (Ψ) relative content (RWC) two species, Frangula caroliniana Magnolia grandiflora . RWC Ψ's model each had R 2 ≥ 0.7 %RMSE = 7–10. constructed PV with estimates compared the accuracy of directly measured spectra‐predicted Our findings indicate that measurements are alternative method estimating F. TLP's values were −1.62 ± 0.15 (means SD) 0.34 MPa observed reflectance predicted, respectively ( P > 0.05), while M. −1.78 −1.66 0.41 0.05). The estimation through reflectance‐based opens broad range possibilities future research aimed at understanding monitoring relations large scale ecophysiology.