Desenvolvimento de plântulas de Handroanthus impetiginosus (Mart. ex DC.) Mattos em substrato contaminado por chumbo

Abstract

Some forest tree species can develop even in a limited way in contaminated soils providing an alternative solution to the current problems of heavy metals in soil. This study aims to analyze the growth of Handroanthus Impetiginosus using biometric measurements and to evaluate the effects of lead metal on the seed germination sourced from two locations of Brejo Paraibano. The experimental design used in this study was a completely randomized design, utilizing seeds of the purple Ipe tree sourced from two locations (Solânea and Bananeiras) of Brejo Paraibano. The seeds were submitted to four different concentrations (0, 70, 110, and 180 mg L-1 ) of lead nitrate solution (Pb (NO3)2), repeating each one eight times. The research measured germination percentage, and biometric features such as root length, hypocotyl length, complete seedling length, collar diameter, and seedling fresh and dry mass. Locality 1 showed higher germination percentage and increase in biometric measurements at the dose of 70 (mg. L -1). Locality 2 showed higher germination and biometric measurements in the control and showed decline with increasing concentration. The germination of seeds of ipê-roxo did not show toxicity by lead, but the seedling of ipe,through the morphometric variables evaluated, was sensitive to lead, mainly in high concentrations.