High salinity in the root zone affects the growth of many plant species. soil salinity can lead to reduced emergence and low growth of seedlings. The objective of this study was to evaluate the growth of banana passion fruit (P. tripartita var. mollissima (Kunth) L. H. Bailey) seedlings under saline stress. The salinity effect on growth and dry matter (DM) production of banana passionfruit seedlings was evaluated under greenhouse conditions at Tunja / Colombia. Plantlets were grown in plastic bags filled with soil and 0; 20; 40 and 80mM NaCl were added to the soil, which induced the following different electrical conductivity levels: 0.70; 2.38; 3.47 and 5.49 ds m -1 respectively. salt was added gradually to the soil, up to the mentioned concentration. Results indicate significant differences among treatments. Plants of the control treatment without salt had higher number of leaves, total stem + shoot length, specific leaf weight, leaf area and DM in relation to salt treated plants. Leaf area and DM production were drastically reduced by salinity, especially by 80mM NaCl. The DM partitioning was also affected by salinity, reducing dry matter accumulation in leaves and increasing the DM in petioles + stems + shoots and roots. The findings from the study indicate that banana passionfruit seedlings are moderately sensitive to salt stress.
El estrés salino es uno de los problemas ambientales más serios que limita la productividad en plantas cultivadas. En sistemas de producción bajo invernadero causa problemas osmóticos a las raíces, debido al suministro de agua y de fertilizantes a través de la fertirrigación, con su consecuente acumulación de sales entorno a la zona de las raíces. El propósito de esta investigación fue la evaluación de los efectos de la salinidad por cloruro de sodio (NaCl) sobre algunas características cualitativas de los frutos en cuatro híbridos de tomate (Lycopersicon esculentum Mill). El estudio, se realizó bajo invernadero en Tunja/Colombia en plántulas de los híbridos Supermagnate F1, Marimba F1, Gloria F1 y Astona F1 que crecían en materas con suelo, con capacidad para 3,5kg, se expusieron a 40 y 80mM de NaCl. Las plantas control no fueron tratadas; ésto correspondió a valores de conductividad eléctrica de 5,2 y 8,8dS.m-1, respectivamente y 1,8dS.m-1 para los controles. Las materas, se regaron dos veces por semana y se evitó el exceso de agua. Los resultados mostraron que el porcentaje de proteína, de fibra, de grasas y de carbohidratos fue más elevado en frutos de plantas tratadas con NaCl que en los de las plantas control, mientras que los contenidos de cenizas y de humedad, se redujeron con la salinidad. No se encontraron diferencias estadísticas entre híbridos ni entre la interacción híbridos x salinidad.
Plants may undergo partial defoliation due to natural or accidental factors. The present study presents the results of an experiment to determine the effects of partial defoliation on the growth of strawberry plants (Fragaria × ananassa Duch. cv. 'Chandler') in Tunja, Colombia. Three defoliation levels were applied to plants after transplanting: 38% defoliation, 67% defoliation, and a control without defoliation. Water uptake, dry matter distribution among different plant organs, leaf area, and total dry weight were measured. Using this information it was possible to calculate leaf area ratio (LAR), leaf weight ratio (LWR), absolute and relative growth rates, and water use efficiency. All variables evaluated showed reduced values as a result of defoliation, which indicates that strawberry plants are sensitive to defoliation levels above 38% and show severely compromised growth as a result.
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