AVALIAÇÃO DO CRESCIMENTO INICIAL DAS ESPÉCIES HANDROANTHUS AVELLANEDAE (Lorentz ex Griseb.) Mattos E HANDROANTHUS SERRATIFOLIUS (Vahl.) S. Grose (BIGNONIACEAE-LAMIALES) EM DIFERENTES DOSAGENS DE NÍQUEL.

Abstract

This research seeks for statistic evidences which show that Handroanthus serratifolius and Handroanthus avellanedae are able to survive, endure and develop in different nickel dosages in the soil. These species have ornamental, landscaping, timber and medicinal potential, they can provide income while decontaminate the soil. The experiment (Figure 3a) was carried out with five by applying the following dosages of Ni: 0.0 mg.L-1, 20.0 mg L-1, 40.0 mg L-1, 60.0 mg L-1 and 80mg.L-1 and 100.0 mg l-1, each treatment had seven repetitons. The different solutions containing nickel were obtained by dilution of a stock standard solution (100.0 mg l-1) using (NiNO3) 2. The growth analysis is a method that describes the morphophisiological conditions of the plant at certain times, to quantify its development (Magalhães, 1979). It allows to know the functional and structural differences among the plants and to estimate the biomass formation, to identify responses to treatments (BENINCASA, 2003). For data analysis, statistical tests were performed using ANOVA. Different concentrations of the heavy metal nickel did not affect significantly the growth and development of the Handroanthus avellanedae and Handroanthus serratifolius species regarding the height, diameter, leaf area, dry weight of the air part, dry weight of roots and anatomical cuts parameters. It was concluded that the surveyed plants can tolerate the presence of the heavy metal Ni during the initial growth period. The anatomical structure also was not altered by the application of nickel, remaining without cell and tissue damages. These species have potential for use in contaminated areas by nickel, once the concentration supported is higher than Brazilian law calls for this heavy metal.