Possible Effect on the Recovery of Grafted Mango Seedlings Using Naphthalene Acetic Acid

The application of naphthalene acetic acid (NAA) of different concentrations (25, 50, and 75 ppm) was applied to grafted mango seedlings to identify its effect on callus formation, callus diameter, shoot emergence, and plant survival. NAA effectively reduced the number of days to callus formation, mainly using 75 ppm. Lower than this concentration exhibited a comparable callus formation, the same as the untreated seedlings. The callus diameter, shoot emergence, and plant survival showed no significant effect by applying NAA, even with how high or low the concentration was. Low and higher than the concentrations used, young scions may be used for further investigation. Likewise, other plant growth regulators should be used to hasten the callus development and higher plant recovery rate in grafted mango seedlings. 