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Article

Chlorophyll Fluorescence Kinetics May Be Useful to Identify Early Drought and Irrigation Effects on Photosynthetic Apparatus in Field-Grown Wheat

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Department of Plant Physiology, Slovak University of Agriculture, Nitra, Tr. A. Hlinku 2, 94901 Nitra, Slovakia
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Department of Water Resources and Environmental Engineering, Slovak University of Agriculture, Nitra, Tr. A. Hlinku 2, 94901 Nitra, Slovakia
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National Agricultural and Food Centre, Research Institute of Plant Production, 921 68 Piešťany, Slovakia
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Institute of Landscape Ecology, Slovak Academy of Sciences, 814 99 Bratislava, Slovakia
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Department of Botany and Plant Physiology, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences, 165 00 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(9), 1275; https://doi.org/10.3390/agronomy10091275
Received: 20 July 2020 / Revised: 25 August 2020 / Accepted: 25 August 2020 / Published: 28 August 2020
(This article belongs to the Section Crop Breeding and Genetics)
To assess the reliability and sensitivity of non-invasive optical methods to detect the early effects of water deficit in the field, we analyzed the time-series of non-invasive measurements obtained in a dry season in a representative collection of wheat genotypes grown in small-plot field trials, in non-irrigated and irrigated variants. Despite a progressive water deficit and significant yield loss, the measurements indicated very minor changes in chlorophyll content or canopy cover. This corresponded well to the insignificant differences in spectral reflectance normalized difference vegetation index (NDVI) values. On the other hand, we identified the significant and rapid response of fast fluorescence kinetics data following the onset of irrigation. Analysis of parameters showed the main effects of drought were associated with changes in the amplitude of the I–P phase of the OJIP transient, indicating changes at the level of photosystem I and beyond. Statistical analyses identified the integrative parameter performance index PItot as the most sensitive parameter, which well-reflects the differences in responses of the genotypes to water deficit. Our results suggest that focusing on photosynthetic functions detected by the rapid chlorophyll fluorescence records can provide more accurate information on the drought stress level, compared to the structural data obtained by absorbance or reflectance measurements. View Full-Text
Keywords: chlorophyll fluorescence; spectral reflectance; drought; stress; phenotyping; wheat; performance index chlorophyll fluorescence; spectral reflectance; drought; stress; phenotyping; wheat; performance index
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MDPI and ACS Style

Botyanszka, L.; Zivcak, M.; Chovancek, E.; Sytar, O.; Barek, V.; Hauptvogel, P.; Halabuk, A.; Brestic, M. Chlorophyll Fluorescence Kinetics May Be Useful to Identify Early Drought and Irrigation Effects on Photosynthetic Apparatus in Field-Grown Wheat. Agronomy 2020, 10, 1275. https://doi.org/10.3390/agronomy10091275

AMA Style

Botyanszka L, Zivcak M, Chovancek E, Sytar O, Barek V, Hauptvogel P, Halabuk A, Brestic M. Chlorophyll Fluorescence Kinetics May Be Useful to Identify Early Drought and Irrigation Effects on Photosynthetic Apparatus in Field-Grown Wheat. Agronomy. 2020; 10(9):1275. https://doi.org/10.3390/agronomy10091275

Chicago/Turabian Style

Botyanszka, Lenka, Marek Zivcak, Erik Chovancek, Oksana Sytar, Viliam Barek, Pavol Hauptvogel, Andrej Halabuk, and Marian Brestic. 2020. "Chlorophyll Fluorescence Kinetics May Be Useful to Identify Early Drought and Irrigation Effects on Photosynthetic Apparatus in Field-Grown Wheat" Agronomy 10, no. 9: 1275. https://doi.org/10.3390/agronomy10091275

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