Impact of salinity on macro- and micronutrients uptake in mango (Mangifera indica L. cv. Osteen) with different rootstocks

Two mango (Mangifera indica L.) rootstocks Gomera-1 and Gomera-3, grafted with the scion Osteen, were irrigated at four different NaCl concentrations measured by electrical conductivity (1.02, 1.50, 2.00 and 2.50 dS m-1). The aim was to determine the impact of salinity on macro- and micronutrient uptake. The nutrient imbalances from the effect of salinity on nutrient uptake, availability and partitioning within the plant resulted in less injurious with Gomera-1. Thus, the results corroborated the higher capability of Gomera-1 respect to Gomera-3 rootstocks to better adapt to saline conditions. The saline irrigation in leaves significantly raised the concentration of P, Ca, Fe, Zn and Mn, and lowered the Mg of both rootstocks, tending to decrease the N, and increase K and Cu. In the stem the values for N, Ca, Mg and Cu significantly augmented, whereas Zn tended to decrease. The root system registered a significant decrease of P, K and Mg and increase of N, Fe, Mn and Cu, while the fibrous root tended to concentrate most nutrients with more intensity than did the main root. With Gomera-1 the micronutrient concentrations in roots was higher than Gomera-3 in response to rising NaCl concentration.