Abstract
The aim of this work was to establish the criteria to determine the relative tolerance of mango rootstocks (Mangiferaindica L.) to high Cl- and Na+ concentrations present in irrigation water. Two rootstocks, Gomera-1 and Gomera-3 grafted with the cultivar Osteen, were subjected to study. Grafted plants were exposed to salinized irrigation watersmeasured by electrical conductivity (1.02, 1.50, 2.00 and 2.50 dS m-1). Results indicated differences in retainingtoxic elements in different organs (roots, stem, or leaves) of both rootstocks. Gomera-3 was more sensitive as took uphigher amounts of Cl- and Na+ than Gomera-1. Gomera-1 was more tolerant, being the tolerance possibly associatedwith the capacity of this rootstock to restrict the uptake and transport of Cl- and Na+ ions from the root system to theaboveground parts. The Cl- ions were more toxic in rootstock and cultivar leaves, while the Na+ ions were more toxicin the roots. Therefore, the present study reveals that Gomera-1 proved to be the most adaptable rootstock to salineconditions, making it feasible for use in areas with low water quality.
Highlights
On the littoral band of the Spanish provinces of Granada and Malaga there is a large area dedicated to subtropical fruit production that covers approximately 13,000 ha, of which 8,500 are dedicated to avocado (Persea americana Mill.), 3,500 to custard apple (Annona cherimolia Mill.) and 1,000 to other species pro-duction (Calatrava, 1998)
It was clearly established that plants with the Gomera-3 rootstock were the most affected by the salt treatments
It can be seen that the symptomatology in the plants of both rootstocks was similar until treatment B (1.5 dS m-1), presenting very mild symptoms (VMC)
Summary
On the littoral band of the Spanish provinces of Granada and Malaga there is a large area dedicated to subtropical fruit production that covers approximately 13,000 ha, of which 8,500 are dedicated to avocado (Persea americana Mill.), 3,500 to custard apple (Annona cherimolia Mill.) and 1,000 to other species pro-duction (Calatrava, 1998). On the littoral band of the Spanish provinces of Granada and Malaga there is a large area dedicated to subtropical fruit production that covers approximately 13,000 ha, of which 8,500 are dedicated to avocado (Persea americana Mill.), 3,500 to custard apple (Annona cherimolia Mill.) and 1,000 to other species pro-. The use of poor quality waters on these subtropical crops has caused many problems due to the sensitivity of these fruit species to soluble salts, especially chlorides. The use of brackish waters for irrigation can increase the salt concentration in the soil and, hinder plant growth and reduce production (Alkilan et al, 1997). Durán Zuazo et al / Spanish Journal of Agricultural Research (2003) 1 (1), 67-78
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