Impact of ascorbic acid in salt tolerant of some mango rootstock seedlings.
Hafez O. M., Malaka A. S., Ellil A. A. A., Kassab O. M.
Author Affiliation: Pomology Dept., National Research Centre, Dokki, Giza, Egypt.
Journal of Applied Sciences Research : 1492-1500
Abstract : Two mango, Mangifera indica L. rootstocks (Sukkary and Zebda) were selected to study the effect of ascorbic acid (100 and 200 ppm) and irrigation water salinity (2000 and 4000 ppm) and their combination in addition to the untreated one (control) on their plant characters, nutrient contents and proline content. Obtained results showed that salinity treatments inhibited various studied growth parameters (i.e. stem length, stem diameter, leaf area, radical root length, radical root diameter, fine root number and dray weight of air (stem and leaves) and root system). Also the contents of N, P, K and Fe decreased, while Na and proline contents increased. Ascorbic acid has a promotive effect on increasing most of the growth parameters, leaf nutrient contents and proline content. The low salt content in irrigation water (2000 ppm) lower inhibits vegetative growth and on the contrary in case of highest one (4000 ppm). Combination between ascorbic and salinity water treatments especially ascorbic 100 ppm and salinity 2000 ppm encourage most of the investigated vegetative growth, while the high level of ascorbic acid (200 ppm) and salt content in irrigation water (4000 ppm) individually or combined were more effective increasing proline content. It could be concluded that the increase in plant resistance to salt-stress was associated with the anti-oxidant activity of ascorbic acid and a partial inhibition of salt-induced. Also, Sukkary rootstock proved to be more appropriate rootstock for use in regions irrigated with saline water reaching 4000 ppm.