Modelling of the relationship between the SPAD values and photosynthetic pigments content in Quercus petraea and Prunus serotina leaves

Bielinis, Ernest; Jóźwiak, Weronika; Robakowski, Piotr

doi:10.12657/denbio.073.013

Cited by 22 publications

(23 citation statements)

References 39 publications

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“…The use of an image processing method requires calibration to be performed separately for each species and cultivar. This issue also affects leaf greenness meters (Chang, Robison, 2003;Bielinis et al, 2015), as the accuracy of such estimation Table 2 presents the correlation coefficients between the nitrogen content in the leaves of apple trees and indices of chlorophyll content and various RGB formulas. In the early stages, very high correlation coefficients between the nitrogen content in the leaves of apple trees were recorded for the SPAD and CCM indices.…”

Section: Resultsmentioning

confidence: 99%

Possibilities of using image analysis to estimate the nitrogen nutrition status of apple trees

Treder

Klamkowski

Kowalczyk

et al. 2016

Zemdirbyste-Agriculture

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Precise timing and rate of nitrogen (N) fertilizer application play a major role for crop yield and quality. Prediction of N requirements is necessary for efficient utilization of nitrogen fertilizers. A user-friendly method for estimating foliar nitrogen concentration, based on an analysis of leaf blade colour, was developed in the study. Apple tree (Malus domestica Borkh.) was used as a model species for the validation of the proposed method. Digital recording of adaxial leaf surface was performed using a flatbed scanner. The acquired images were analysed to obtain average values of basic colours: red, green and blue (RGB). Analyses of the relationships between N concentration in the leaves, leaf greenness indices (determined with SPAD-502 and CCM-200 meters) and RGB colour components were performed. The best fitted models were: a multiple regression model based on RGB primary colour values and a model that included the values of the red and blue colours as well as a parameter describing the age of the leaf. The performed tests showed that the analysis of scanned images provided a more precise determination of leaf nitrogen content in apple trees compared to the measurements conducted with leaf greenness meters.

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Section: Resultsmentioning

confidence: 99%

Possibilities of using image analysis to estimate the nitrogen nutrition status of apple trees

Treder

Klamkowski

Kowalczyk

et al. 2016

Zemdirbyste-Agriculture

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“…Ten leaf relative chlorophyll content indexes were measured per individual tree and averaged for the day to give the mean daily relative chlorophyll content index of that particular day per species. It is important to sample for chlorophyll concentration at the same time of day (Bielnis et al., ). Thus, all relative chlorophyll content indexes were taken between 13:00 and 16:00 hours on measurement days.…”

Section: Methodsmentioning

confidence: 99%

“…To convert the relative units of the SPAD meter to absolute chlorophyll concentrations, we removed leaves from the trees and extracted chlorophyll from identical leaf area locations used for SPAD measurements as described previously (Markwell et al., ; Coste et al., ; Silla et al., ; Bielnis et al., ). Chlorophyll was extracted once near the beginning of fall and once near the end of the fall to create a standardization curve for the conversion of SPAD measurements to chlorophyll content.…”

Section: Methodsmentioning

confidence: 99%

Synchrony in fall leaf drop: chlorophyll degradation, color change, and abscission layer formation in three temperate deciduous tree species

Primka

Smith

2019

American J of Botany

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Citation: Primka IV, E. J. and W. K. Smith. 2019. Synchrony in fall leaf drop: chlorophyll degradation, color change, and abscission layer formation in three temperate deciduous tree species. PREMISE OF THE STUDY:Deciduous tree species remove some nutrients from their leaves during fall leaf senescence through retranslocation. Retranslocation impacts the timeline of leaf fall, amount of active chlorophyll, and overall leaf nitrogen content as fall color change occurs. Our objective was to identify interspecific differences in the timing of abscission layer formation, leaf color change, and the level of chlorophyll degradation of young trees during fall senescence. METHODS:Leaf relative chlorophyll content for three tree species was measured during fall 2015 by a greenness meter. These measurements were calibrated for each species through spectrophotometric determination of leaf chlorophyll concentration. Abscission layer formation was tracked using light microscopy of sampled leaves. Excised leaves were photographed on a flat white surface to track species leaf color through time.KEY RESULTS: All three species had different chlorophyll declination rates throughout the fall season. The maple species started with less chlorophyll and began abscission layer formation earlier. The other two species had a similar starting chlorophyll level and onset timing of abscission layer formation. Visible leaf color change was not associated with a threshold in either chlorophyll degradation or abscission layer formation across species. CONCLUSIONS:Maple species degraded less chlorophyll on average, in the fall, than did the oak and beech species. The rate of chlorophyll degradation in coordination with abscission layer formation varied by species. Color change was not a good predictor of level of chlorophyll degradation in leaves across species.

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“…The chlorophyll content in leaves primarily reflects the physiological condition of the plant, which can be responsible for reduced intensity of photosynthesis and can correlate with the decreased accumulation of organic compounds [62].…”

Section: Resultsmentioning

confidence: 99%

Influence of Electromagnetic Stimulation of Seeds on the Photosynthetic Indicators in Medicago sativa L. Leaves at Various Stages of Development

Dziwulska‐Hunek

Kornarzyńska-Gregorowicz

Niemczynowicz

et al. 2020

Agronomy

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The paper explores the impact of electromagnetic stimulation of Ulstar alfalfa seeds on fresh mass yield, the quantum efficiency of the plants’ photochemical reactions, and the content of photosynthetic pigments in leaves. Before sowing, seeds were subjected to electromagnetic stimulation in the following configurations: control (C), no stimulation; stimulation with He–Ne laser light with the wavelength of 632.8 nm, surface power density of 3 mW·cm−2 and exposition time of 1 min (L1) or 5 min (L5); stimulation with alternating magnetic field with the induction of 30 mT and exposition time of 1 min (F1) or 5 min (F5). It was established that the variability of alfalfa yields at the onset of anthesis was dependent on weather conditions as well as, above all, on the electromagnetic stimulation employed. At the same time, the values of fresh mass yield of alfalfa and photosynthetic efficiency were higher in the first year of cultivation (2014) compared to the last year (2016). In terms of photosynthetic efficiency, the best results were observed for L1 and F5, respectively: 0.801 and 0.800. The significantly highest values in terms of chlorophyll a and b and carotenoid content were observed in 2014 at the onset of budding in the combination involving alternating magnetic field stimulation (F5), and were, respectively, 30%, 28% and 73% relative to the control.

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Modelling of the relationship between the SPAD values and photosynthetic pigments content in Quercus petraea and Prunus serotina leaves

Cited by 22 publications

References 39 publications

Possibilities of using image analysis to estimate the nitrogen nutrition status of apple trees

Possibilities of using image analysis to estimate the nitrogen nutrition status of apple trees

Synchrony in fall leaf drop: chlorophyll degradation, color change, and abscission layer formation in three temperate deciduous tree species

Influence of Electromagnetic Stimulation of Seeds on the Photosynthetic Indicators in Medicago sativa L. Leaves at Various Stages of Development

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