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Analysis of nutrient, heat and water deficit stress by reflectance and fluorescence measurements in sunflower plants
Published:
2024-12-31
https://doi.org/10.12666/7cg2zy17
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Copyright (c) 2024 Kristóf Bene, Ágota Besenyei, Ádám Mészáros, Szilvia Fóti, De Luca Giulia, János Balogh
This work is licensed under a Creative Commons Attribution 4.0 International License.
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Bene, K., Besenyei, Á., Mészáros, Á., Fóti, S., Giulia, D. L., & Balogh, J. (2024). Analysis of nutrient, heat and water deficit stress by reflectance and fluorescence measurements in
sunflower plants. Növénytermelés, 73(4), 25-42. https://doi.org/10.12666/7cg2zy17
Abstract
During the experiment we used several types of data collection, reflectance measurements, fluorescence measurements, photosynthesis measurements and pigment content measurements. We calculated vegetation indices from the reflectance spectra and selected the most useful ones from the fluorescence data. Photosynthesis and pigment content measurements were correlated with vegetation indices. Among the indices, the VIgreen index proved to be effective in detecting and partitioning abiotic stresses and in determining nitrogen supply. The PRI index correlated best with the level of photosynthesis and the mNDVI index showed a strong correlation with pigment content.
By examining several fluorescence parameters, we conclude that the Fs value can be useful for detecting water stress, especially when measured in parallel with reflectance measurements from which the sensitivity to senescence index (PSRI) can be calculated.
This observation may also be useful in field conditions, as short-term water deficit stress increases, while long-term stress decreases (due to loss of pigmentation) fluorescence (Fs).
By examining several fluorescence parameters, we conclude that the Fs value can be useful for detecting water stress, especially when measured in parallel with reflectance measurements from which the sensitivity to senescence index (PSRI) can be calculated.
This observation may also be useful in field conditions, as short-term water deficit stress increases, while long-term stress decreases (due to loss of pigmentation) fluorescence (Fs).
