Características radiculares e fisiológicas de pinhão-manso (Jatropha curcas L.) propagado por semente e por estaca cultivados sob diferentes condições hídricas

Abstract

The study aimed to evaluate the root development and some physiologiacal characteristics in seedlings of physical nut (Jatropha curcas L.) propagated by seeds and cuttings, subjected to water deficit. The experiment was carried out in a greenhouse at the Center for Agrarian Sciences, Federal University of Alagoas, in the period July to October 2011. The experimental design was completely randomized in a 2x3 factorial (propagation and hydric conditions), with four replicates totaling 24 plots. Plants propagated by seeds or cuttings were cultivated in rhizotrons subjected to three different water levels conditions: continuously irrigated plants, plants subjected to full suspension of irrigation for twenty days and plants rehydrated after twenty days in dry conditions. Measurements were made of vertical root growth, root growth speed, relative water content, electrolyte leakage, photochemical efficiency (Fv / Fm) and index SPAD. These results showed that Jatropha curcas is a water stress resistant species, and the vegetative propagation by cuttings is recommended, as plants present drought resistance and show fast rate of growth, ensuring high productivity in a short period of time.