Comportamento de mudas de Passiflora edulis sob estresse hídrico e submetidas a doses de metassilicato de sódio.

Abstract

The objective of this work was to evaluate growth parameters, biochemical parameters, relative water content and nutritional evaluation of passion fruit plants when submitted to different silicon concentrations under water deficit. Passiflora edulis (yellow passion fruit) seeds were sown in a 4.6 L capacity Leoanard pot adapted with pet bottles containing washed and sterilized sand (120 ºC for 40 min.). At 7 days after sowing the plants received nutrient solution. Si concentrations were applied via solution, the first application being performed on March 30, 2018. Water stress occurred on May 15th in a 7-day period. It was used a completely randomized design in a factorial scheme 2 water conditions: control and water stress, 5 silicon concentrations (0; 0.5; 1.0; 1.5 and 2.0 millimolar) and five replications. The obtained data were subjected to analysis of variance by the F test (p <0.05) and the means were compared by the minimum significant difference of the test and were adjusted by polynomial regression equations P <0.01 or 0.05 using the Sisvar program. The variables sugar reducers, total soluble carbohydrates and proteins were influenced with the application of silicon and under water stress influencing their energy process. For growth variables (height, diameter, number of leaves), silicon increased as doses were increased, interfering with biomass production. Changes in physiological parameters led to changes in the carbon and nitrogen metabolism of these plants, showing high concentrations of nitrogen-containing variables in their structures as proline. Water deficiency can have several impacts on plant development. However, we know that silicon (Si) is an element that can minimize the effects of this deficiency.