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Leaf area prediction models from growth measurements in Andean blueberry (Vaccinium meridionale Swartz) in the nursery
Modelos de predicción de área foliar a partir de mediciones de crecimiento en agraz (Vaccinium meridionale Swartz) en vivero
DOI:
https://doi.org/10.15446/agron.colomb.v40n3.105039Keywords:
average leaf area, regression analysis, weighted least squares, Andean species, Ericaceae (en)área foliar promedio, análisis de regresión, mínimos cuadrados ponderados, especies andinas, Ericaceae (es)
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The Andean blueberry is a high-Andean wild fruit species consumed in fresh or processed form that has high potential due to its antioxidant capacity. Leaf area describes the photosynthetic capacity of plants and is employed as a variable in multiple physiological studies; however, in Andean blueberry (Vaccinium meridionale Swartz), its direct measurement is costly. The aim of this research was to propose models for estimating the leaf area in young Andean blueberry plants using morphometric variables. In the study, 436 Andean blueberry plants of different ages (10 to 26 months) obtained with different methods of asexual propagation (tissue culture or cuttings) were used. Variables, such as dry weight per organ, leaf area, plant height, number of vegetative shoots and number of leaves, were measured. Simple and multiple regressions were performed and the “weighted least squares” technique was used to meet the regression assumptions. Five models with coefficients of determination (R2) greater than 0.81 were proposed. Two models were of the multiple type and employed the number of leaves together with the dry weight of leaves or the total dry weight as predictor variables. The other models were linear and used total dry weight, dry weight of leaves or number of leaves as explanatory variables of leaf area; the number of leaves was a particularly interesting variable due to its non-destructive nature. The models presented could be a useful tool for estimating leaf area in future studies in Andean blueberry.
El agraz es un frutal silvestre altoandino de consumo en fresco o procesado que presenta alto potencial debido a su capacidad antioxidante. El área foliar describe la capacidad fotosintética de las plantas y se emplea como variable en múltiples estudios fisiológicos; no obstante, en agraz (Vaccinium meridionale Swartz) su medición directa resulta dispendiosa. El objetivo de esta investigación fue plantear modelos para estimar el área foliar en plantas jóvenes de agraz, empleando variables de tipo morfométrico. Se utilizaron 436 plantas de agraz de diferentes edades (entre 10 y 26 meses) obtenidas a partir de propagación asexual (estacas o cultivo de tejidos). Se midieron variables como peso seco por órgano, área foliar, altura de la planta, número de brotes vegetativos y número de hojas. Se realizaron regresiones simples y múltiples y se utilizó la técnica de “mínimos cuadrados ponderados” para cumplir con los supuestos de la regresión. Se plantearon cinco modelos con coeficientes de determinación (R2) superiores a 0.81. Dos modelos fueron de tipo múltiple y emplearon el número de hojas junto con el peso seco de hojas o el peso seco total como variables predictoras. Los otros tres modelos fueron de tipo lineal y utilizaron el peso seco total, el peso seco de hojas o número de hojas como variables explicativas del área foliar, siendo el número de hojas particularmente interesante por su carácter no destructivo. Los modelos presentados pueden ser una herramienta útil para estimar el área foliar en futuras investigaciones en agraz.
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