Combined effect of green-colored covers and shading on the growth of sisal (Furcraea hexapetala) plants
Efecto combinado de coberturas de color verde y el sombreado sobre el crecimiento en plantas de fique (Furcraea hexapetala)
DOI:
https://doi.org/10.15446/agron.colomb.v35n3.65922Keywords:
transmittance, red/far red ratio, abiotic stress, crassulacean acid metabolism, light quality, chlorophyll (en)transmitancia, relación rojo/rojo lejano, estrés abiótico, metabolismo ácido de las Crasuláceas, calidad de luz, clorofila (es)
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Plants have the ability to respond in different ways to the quality of light, its intensity, and the combination of both. In addition, chlorophyll absorbs light in the blue and red bands of the spectrum, but green and infrared light are poorly absorbed or not absorbed, yet they affect plant morphogenesis. An experiment was carried out in Tunja, Colombia, in which the influence of shading on sisal plants (Furcraea hexapetala) was evaluated. The plants were placed under green polypropylene filters that induced 55.4, 85.8 and 90.1% light reduction and were compared with open exposure plants in a greenhouse. As a consequence of shading, the values of the following variables were reduced: chlorophyll content index by between 52.2 and 55.0%, dry mass by between 80.8 and 94.0%, water uptake by between 40.9 and 44.9%, water use efficiency by between 23.0 and 53.7% and relative growth rate by between 35.1 and 58.4%, as compared to the control, while the values for the root to shoot ratio, specific leaf area and leaf area ratio were increased by ranges of 24.2 to 73.5%, 107.5 to 132.4% and 116.6 to 174.9%, respectively. The shading with green filters induced a reduction in the red/far red ratio of light. Based on these results, it was possible to infer that the sisal plants presented low plasticity for tolerating the abiotic stress induced by green-filter shading.
Las plantas tienen la capacidad de responder de diferentes formas a la calidad de la luz, a su intensidad, y a la combinación de ambas. Adicionalmente, las clorofilas absorben la luz en las franjas azul y roja del espectro, pero la luz verde e infrarroja se absorben poco o no se absorben, no obstante, afectan la morfogenesis en plantas. Se desarrollo en Tunja, Colombia, un experimento en el que se evaluo la influencia del sombreado sobre plantas de fique (Furcraea hexapetala). Se colocaron las plantas bajo filtros de polipropileno de color verde que indujeron 55,4; 85,8 y 90,1% de reduccion de la luz y se compararon con plantas a libre exposicion dentro de un invernadero. Como consecuencia del sombreado, en relación con las plantas control, se redujeron los valores de las siguientes variables: el indice de contenido de clorofila entre 52,2 y 55,0%, el contenido de masa seca entre 80,8 y 94,0%, la toma de agua entre 40,9 y 44,9%, la eficiencia en el uso del agua entre 23,0 y 53,7%, la tasa de crecimiento relativo entre 35,1 y 58,4%, mientras que los valores de la relacion raiz/parte aerea, el área foliar especifica y la relacion de area foliar se aumentaron en rangos de 24,2 a 73,5%; 107,5 a 132,4% y 116,6 a 174,9%, respectivamente. El sombreado mediante los filtros de color verde indujo una reduccion en la relacion rojo/rojo lejano de la luz. Con base en estos resultados se pudo inferir que las plantas de fique presentan poca plasticidad para tolerar el estres abiótico inducido por el sombreado a traves de los filtros de color verde.
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