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Article

Proximal Imaging of Changes in Photochemical Reflectance Index in Leaves Based on Using Pulses of Green-Yellow Light

1
Department of Biophysics, N.I. Lobachevsky State University of Nizhny Novgorod, 603950 Nizhny Novgorod, Russia
2
Institute of Applied Physics of the Russian Academy of Sciences, 603155 Nizhny Novgorod, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Frédéric Cointault
Remote Sens. 2021, 13(9), 1762; https://doi.org/10.3390/rs13091762
Received: 1 April 2021 / Revised: 26 April 2021 / Accepted: 29 April 2021 / Published: 1 May 2021
(This article belongs to the Special Issue Remote and Proximal Sensing for Precision Agriculture and Viticulture)
Plants are affected by numerous environmental factors that influence their physiological processes and productivity. Early revealing of their action based on measuring spectra of reflected light and calculating reflectance indices is an important stage in the protection of agricultural plants. Photochemical reflectance index (PRI) is a widely used parameter related to photosynthetic changes in plants under action of stressors. We developed a new system for proximal imaging of PRI based on using short pulses of measuring light detected simultaneously in green (530 nm) and yellow (570 nm) spectral bands. The system has several advances compared to those reported in literature. Active light illumination and subtraction of the ambient light allow for PRI measurements without periodic calibrations. Short duration of measuring pulses (18 ms) minimizes their influence on plants. Measurements in two spectral bands operated by separate cameras with aligned fields of visualization allow one to exclude mechanically switchable parts like filter wheels thus minimizing acquisition time and increasing durability of the setup. Absolute values of PRI and light-induced changes in PRI (ΔPRI) in pea leaves and changes of these parameters under action of light with different intensities, water shortage, and heating have been investigated using the developed setup. Changes in ΔPRI are shown to be more robust than the changes in the absolute value of PRI which is in a good agreement with our previous studies. Values of PRI and, especially, ΔPRI are strongly linearly related to the energy-dependent component of the non-photochemical quenching and can be potentially used for estimation of this component. Additionally, we demonstrate that the developed system can also measure fast changes in PRI (hundreds of milliseconds and seconds) under leaf illumination by the pulsed green-yellow measuring light. Thus, the developed system of proximal PRI imaging can be used for PRI measurements (including fast changes in PRI) and estimation of stressors-induced photosynthetic changes. View Full-Text
Keywords: photochemical reflectance index; PRI; photosynthetic proximal sensing; non-photochemical quenching; pulsed light; water shortage; heating; plants photochemical reflectance index; PRI; photosynthetic proximal sensing; non-photochemical quenching; pulsed light; water shortage; heating; plants
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MDPI and ACS Style

Sukhov, V.; Sukhova, E.; Khlopkov, A.; Yudina, L.; Ryabkova, A.; Telnykh, A.; Sergeeva, E.; Vodeneev, V.; Turchin, I. Proximal Imaging of Changes in Photochemical Reflectance Index in Leaves Based on Using Pulses of Green-Yellow Light. Remote Sens. 2021, 13, 1762. https://doi.org/10.3390/rs13091762

AMA Style

Sukhov V, Sukhova E, Khlopkov A, Yudina L, Ryabkova A, Telnykh A, Sergeeva E, Vodeneev V, Turchin I. Proximal Imaging of Changes in Photochemical Reflectance Index in Leaves Based on Using Pulses of Green-Yellow Light. Remote Sensing. 2021; 13(9):1762. https://doi.org/10.3390/rs13091762

Chicago/Turabian Style

Sukhov, Vladimir, Ekaterina Sukhova, Andrey Khlopkov, Lyubov Yudina, Anastasiia Ryabkova, Alexander Telnykh, Ekaterina Sergeeva, Vladimir Vodeneev, and Ilya Turchin. 2021. "Proximal Imaging of Changes in Photochemical Reflectance Index in Leaves Based on Using Pulses of Green-Yellow Light" Remote Sensing 13, no. 9: 1762. https://doi.org/10.3390/rs13091762

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