Effect of homogeneous static magnetic treatment on the adsorption capacity in maize seeds (Zea mays L.)

Abstract

In order to analyze the treatment of seeds with homogeneous static magnetic field on the water adsorption process, an experimental-theoretical study of hygroscopic equilibrium in maize seeds (Zea mays L. cv. ICAV305) was carried out. Four treatments with magnetic induction of 80.0, 120.0, 160.0, and 200.0 mT were applied for 10 min, and there was a control group without treatment. The doses were selected because they showed a decrease in mean germination time. Treated seeds were subjected to an environment with a stable temperature of 30.0 °C ± 0.1 °C and atmospheres of different relative humidity (h), using eight salt solutions saturated with water activity between 0.216 and 0.970. Curves were adjusted using the D'Arcy-Watt and modified Oswin models. It was found that the magnetic treatment of seeds affects adsorption, and the 200 mT-10 min one was the most significant in affecting the mechanisms of adsorption of water, and increasing the number of adsorption sites connected to weak binds with D'Arcy-Watt's adjustment. Using the Oswin model for simulation, we verified that the magnetic stimulus affected the enthalpy of adsorption and the mechanism of incorporation of water vapor molecules to the structure of seminal cover. These results show that the magnetic pre-treatment of seeds has an effect on a seed's specific biophysical and physiological processes in the early stages of germination. Bioelectromagnetics. 39:343-351, 2018. © 2018 Wiley Periodicals, Inc.

Aplicación de Campos magnéticos (CM) y su relación con la recuperación de la viabilidad y vigor en semillas envejecidas de Lactuca sativa L.

“…En semillas de trigo mejoró la velocidad de germinación (Wyjcik, 1995). En soya se observó una mejora en la tasa de absorción de agua, masa e índice de vigor (Shine et al, 2011), destacando un aumento en la capacidad de adsorción de agua en la pared (Socorro et al, 2013;Torres et al, 2018).…”

“…Esta explicación se ve reforzada al observar los valores de humedad promedio para 72, 48 y 24 horas de estrés de envejecimiento (Tabla 3) de 11,40; 28,84 y 32,27%, respectivamente, donde el valor para 24 horas obtiene el mayor nivel de humedad por tener teóricamente menor deterioro y absorver más agua del ambiente de ~100% de humedad que dicta el protocolo de envejecimiento. Esto cobra mayor sentido si se piensa en la relación área/volumen propia de la semilla habría significado una menor cantidad de puntos de adsorción higroscópica dado probablemente y como se indicó, por contar con paredes y membranas deterioradas al momento del equilibrio del contenido de humedad de la semilla (Torres et al, 2018) al momento del inicio de la imbibición. Esta condición hipotética habría traído como consecuencia que al inicio de la Fase I de la imbibición, la molécula de agua no se adhiriera a los tejidos de la semilla alterados como son las membranas celulares por el desprendimiento en la matriz de la pared de compuestos solubles (lixiviados) desde las semillas (Parrish y Leopold, 1978;Pérez y Pita, 2001).…”

Cladophora glomerata Extract and Static Magnetic Field Influences the Germination of Seeds and Multielemental Composition of Carrot

“…In this study it was shown that the content of K in the carrot biomass was 3.5 times higher than in the control group. Many researchers indicate that magnetic field stimulation causes changes in the course of some biochemical and physiological processes in seeds and plants that have a positive effect on plant development and productivity [33,[52][53][54][55][56][57][58][59][60][61]. As a result of the external magnetic field, the plants intensify gas exchange, and as a result, photosynthesis and enzyme activity increase.…”

“…Pre-sowing plant stimulation with a constant or alternating magnetic field resulted in the increase of chlorophyll a (Chl a). Polyphasic Chl a fluorescence transients from the samples that was treated with a magnetic field caused a higher fluorescence yield [54,[63][64][65][66][67]. This in turn results in better plant growth and ultimately increase crop yields [11,21,28,40,[69][70][71][72][73][74][75][76][77].…”

Favourable and Unfavourable Effect of Homogeneous Static Magnetic Field on Germination of Zea mays L (Maize) Seeds

“…The second level is aimed at identifying and explaining the cause of the biological effects observed from the processes activated at the biophysical and biochemical level, since the interpretation of these affectations can be contributed to the understanding of the mechanisms that are unchained in the plant under the effect of the magnetic treatment. The literature reports influence on enzymatic activation, imbibition (Vashisth & Nagarajan, 2010;Shine, Guruprasad, & Anand, 2011), enhanced reactive oxygen species content (Shine et al, 2017), variations in ionic currents (Socorro & García, 2012), modifications in water adsorption processes (Torres, Socorro, & Hincapie, 2018) and changes in the cellular membrane characteristics and RNA quantification (Goodman, Greenebaum, & Marron, 1995).…”