Reevaluating Near-Infrared Reflectance as a Tool for the Study of Plant Water Status in Holm Oak (Quercus ilex subsp. rotundifolia)
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Date
2023
Authors
Peguero Pina, José JavierSancho Knapik, Domingo
Ferrio Díaz, Juan Pedro
López Ballesteros, Ana
Ruiz Llata, Marta
Gil Pelegrín, Eustaquio
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articleArticle
Abstract
Plant water status can be assessed through leaf spectral reflectance in the near-infrared (NIR), the “water bands”, considering indices that include the reflectance at a band absorbed by water over and another one as reference. We have assessed i/ the accuracy of reflectance at 1450, 1599 and 1940 nm without reference bands and ii/ the potential use of leaf water content index (LWCI) for the estimation of plant water status in holm oak, the main host plant for black truffle cultivation. We demonstrated that contact measurements of leaf reflectance in the “water bands” constitute an accurate and non-invasive estimator of relative water content (RWC) in holm oak, despite the absence of a reference wavelength, probably due to the low variation in leaf thickness under dehydration. The use of a reference wavelength, which is needed for remote sensing, diminished the accuracy of RWC estimation. Contrastingly, LWCI increased the accuracy of RWC estimation as well as a reference wavelength were used. However, LWCI required the reflectance value at full turgor, diminishing its potential for implementation at field level. In conclusion, this technique would allow the continuous monitoring of the physiological state of holm oak and intelligent water control in truffle cultivation.
Plant water status can be assessed through leaf spectral reflectance in the near-infrared (NIR), the “water bands”, considering indices that include the reflectance at a band absorbed by water over and another one as reference. We have assessed i/ the accuracy of reflectance at 1450, 1599 and 1940 nm without reference bands and ii/ the potential use of leaf water content index (LWCI) for the estimation of plant water status in holm oak, the main host plant for black truffle cultivation. We demonstrated that contact measurements of leaf reflectance in the “water bands” constitute an accurate and non-invasive estimator of relative water content (RWC) in holm oak, despite the absence of a reference wavelength, probably due to the low variation in leaf thickness under dehydration. The use of a reference wavelength, which is needed for remote sensing, diminished the accuracy of RWC estimation. Contrastingly, LWCI increased the accuracy of RWC estimation as well as a reference wavelength were used. However, LWCI required the reflectance value at full turgor, diminishing its potential for implementation at field level. In conclusion, this technique would allow the continuous monitoring of the physiological state of holm oak and intelligent water control in truffle cultivation.
Plant water status can be assessed through leaf spectral reflectance in the near-infrared (NIR), the “water bands”, considering indices that include the reflectance at a band absorbed by water over and another one as reference. We have assessed i/ the accuracy of reflectance at 1450, 1599 and 1940 nm without reference bands and ii/ the potential use of leaf water content index (LWCI) for the estimation of plant water status in holm oak, the main host plant for black truffle cultivation. We demonstrated that contact measurements of leaf reflectance in the “water bands” constitute an accurate and non-invasive estimator of relative water content (RWC) in holm oak, despite the absence of a reference wavelength, probably due to the low variation in leaf thickness under dehydration. The use of a reference wavelength, which is needed for remote sensing, diminished the accuracy of RWC estimation. Contrastingly, LWCI increased the accuracy of RWC estimation as well as a reference wavelength were used. However, LWCI required the reflectance value at full turgor, diminishing its potential for implementation at field level. In conclusion, this technique would allow the continuous monitoring of the physiological state of holm oak and intelligent water control in truffle cultivation.
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Bibliographic citation
Peguero-Pina, J. J., Sancho-Knapik, D., Ferrio, J. P., López-Ballesteros, A., Ruiz-Llata, M., & Gil-Pelegrín, E. (2023). Reevaluating Near-Infrared Reflectance as a Tool for the Study of Plant Water Status in Holm Oak (Quercus ilex subsp. rotundifolia). Forests, 14(9), 1825. MDPI AG.
AGROVOC subjects
Quercus ilexQuercus ilex
Estrés hídrico
Estrés hídrico
Potencial hídrico foliar
Potencial hídrico foliar
Hojas
Hojas
Espectroscopia infrarrojo cercano
Espectroscopia infrarrojo cercano
Sponsorship
This research was funded by Grants PID2022-136478OB-C32, CNS2022-136156, TED2021-129499A-I00, IJC2020-045630-I and PID2019-106701RR-I00 funded by MCIN/AEI/10.13039/501100011033 and European Union Next Generation EU/PRTR, and by Gobierno de Aragón S74_23R research group.