ESTIMACIÓN DE LAS CONCENTRACIONES RELATIVAS DE CLOROFILA EN FOLIOLOS DE PAPA (Solanum tuberosum L.) UTILIZANDO TÉCNICAS DE REFLECTANCIA DE LA VEGETACIÓN.

Abstract

La cantidad de energía solar absorbida por una hoja es en gran parte función de la concentración foliar de los pigmentos fotosintéticos. Por lo tanto, bajas concentraciones de clorofila pueden limitar el potencial fotosintético y por consiguiente la síntesis de compuestos primarios de una planta. En este trabajo se describe un método no destructivo para estimar las concentraciones de clorofila de foliolos de los cultivares de papa: SA–2563, Pumamaqui y Purranca, basada en la interacción entre la luz y la vegetación, que utiliza la primera derivada de sus respectivos espectros de reflectancia. Como referencia, se utilizaron las unidades SPAD adquiridas por un medidor de clorofila SPAD–502 que fue previamente validado. Correlaciones mayores al 90% entre las amplitudes de las señales obtenidas de derivar los espectros de reflectancia de foliolos en longitudes de onda alrededor de 720 nm y las concentraciones de clorofila medidas con un SPAD–502, evidencian el potencial del método basado en reflectancia de la vegetación como indicador seguro para estimar parámetros bioquímico–fisiológicos de las plantas.Palabras clave: clorofila, reflectancia, Solanum tuberosum L.

High-throughput characterization and phenotyping of resistance and tolerance to virus infection in sweetpotato

“…The major attribute associated to the Resistant category was the mean value of the red-edge band. Several studies have shown the relationship between indices calculated from the reflected RE band and chlorophyll content ( Loayza et al., 2022 ; Sims & Gamon, 2002 ). Likewise, the chlorophyll content and reduction in leaf size were reported as indicators of resistant and susceptible lines to tomato leaf curl virus ( Singh et al., 2019 ) and bean yellow mosaic virus ( Arora et al.…”

Can SPAD Values and CIE L*a*b* Scales Predict Chlorophyll and Carotenoid Concentrations in Leaves and Diagnose the Growth Potential of Trees? An Empirical Study of Four Tree Species

“…A considerable amount of SPAD measurement data has been reported for cereals (e.g., Hordeum vulgare var. coeleste, 26.30-55.95 [43]), vegetables (e.g., Spinacia oleracea, 23.48-39.08 [27]; Solanum tuberosum, 26.45-41.66 [37]), and horticultural crops (e.g., Vitis vinifera, 22.6-34.3 [20]; Vaccinium corymbosum, 57.4-73.1 [36]). Compared to herbaceous crops, the SPAD value of tree species seems to be much higher.…”

“…Con-versely, a strong positive and statistically significant relationship between SPAD values and chlorophyll concentrations, as well as between SPAD values and carotenoid concentrations, was established in Triticum aestivum based on a large measurement dataset (n = 277) [32]. In a few previous reports [18,37], SPAD values were assumed to be linearly related to chlorophyll a, b, and a+b concentrations. However, this relationship for SPAD values versus photosynthetic pigment concentrations was mostly verified as a polynomial model [24,31,32,39,51] or an exponential model [29,52,53].…”

“…Most of the SPAD-related research focused on cereals [31][32][33][34][35], fruit crops [20,36], and vegetables [37], with some investigations on forest trees [38][39][40][41][42]. In addition, compared to the determination of SPAD values, the determination of CIE L*a*b* values in plant leaves has received little attention [20,27,43].…”