Growth evaluation and anatomical root structure of Campomanesia pubescens (Mart. ex DC.) O. Berg (Myrtaceae) under different concentrations of aluminum
Soil acidity is one of the main factors limiting agricultural production due to high aluminum (Al3+) saturation in soil. Campomanesia pubescens (Mart. ex DC.) O. Berg, popularly known as gabiroba, is a species of Myrtaceae family and typical of Brazilian Cerrado. The aim of this study was to evaluate the root growth and anatomical structure of C. pubescens roots, subjected to different concentrations of Al3+, grown in a simple and complete solution as culture form. This experiment was performed with seedlings cultivated hydroponically using a simple and complete solution. The simple nutrient solution was carried out using 0.1 mM of Ca (CaCl2.2H2O) and five concentrations of Al in the form of Al2(SO4)3.18H2O, while the complete nutrient solution of low ionic strength was conducted using 0.5 mM of N (NH4NO3), 0.2 mM of Ca (CaCl2.H2O), 0.2 mM of Mg (MgSO4.7H2O), 0.5 mM of K (K2SO4), 0.1 mM of P (NaH2PO4.2H2O), 10 μM of Fe (FeNa) EDTA, 0.4 μM of Mn (MnSO4.H2O), 0.16 μM of Zn (ZnSO4), 0.04 μM of Cu (CuSO4), 0.5 μM of Mo (MoO3), and 0.04 μM of Co (CoSO4.7H2O).The experiment was a factorial design (2×5) with two nutrient solutions (single and complete) and five aluminum concentrations (0, 150, 300, 600 and 1200 μmol L-1). It was observed that both in simple and complete nutrient solution the rate of root elongation and root growth decreased with increasing Al3+ concentration. At the concentration of 300 μmol L-1, were observed cellular disorganization and rupture of the epidermis. The presence of aluminum inside the vascular cells may indicate some mechanism of transport to other parts of the plant. It was concluded that Campomanesia pubescens showed sensitivity towards high Al3+ concentrations, indicating that the establishment of these plants can be compromised in acidic soils with toxic concentrations of Al3+.
Amaral, E.V.E.J., Sales, J.F., Pinto, J.F.N., Barbosa, L.C.S., Reis, E.F. and Vasconcelos-Filho, S.C. (2018). Growth evaluation and anatomical root structure of Campomanesia pubescens (Mart. ex DC.) O. Berg (Myrtaceae) under different concentrations of aluminum. Acta Hortic. 1217, 121-128
root growth, phytotoxicity, gabiroba, hydroponics cultivation, Campomanesia