Lüdders, Peter

Schmutz, Ulrich

The influence of NaCl salinity (0 and 30 mM NaCl added) in combination with different root zone temperatures (18, 24, and 30°C) on two mango rootstock cultivars (Mangifera indica L., '13-1' and 'Turpentine') was investigated. Expressed on a dry matter basis, NaCl salinity had the lowest effects on leaf growth of the more tolerant rootstock '13-1' (reduction 40.8% from control), roots of '13-1' and roots and leaves of 'Turpentine' were more affected (56.9, 69.0, and 63.9%, respectively). '13-1' stored significantly more Na+ and Cl- in the roots than 'Turpentine'. In 'Turpentine' leaves a significantly higher Na+ content was found, while the Cl- content was slightly lower. It was concluded that the difference in saline tolerance probably based on the ability of '13-1' to protect leaves from excessive Na+ and to accept higher Cl- contents in the leaves without severe growth damage. Significantly higher Ca2+ and Mg2+ contents were found in leaves and roots of '13-1' compared to 'Turpentine'. They might be responsive for tolerating higher Cl- contents in leaf tissues of '13-1' as well as for a higher Na+ retention potential in roots and stems of '13-1'. Optimum vegetative growth was found between 24 and 30°C root zone temperature. Increasing root temperature had no increasing effect on salinity. Highest Na+ and Cl- contents in leaves were found at 18°C. This indicates that at low (30 mM NaCl) saline levels, increasing root zone temperature promoted tolerance mechanisms like higher growth, active exclusion under optimum root temperatures and higher Ca2+ uptake.</p

Effect of NaCl salinity and different root zone temperatures on growth and mineral composition of two mango rootstocks (Mangifera indica L.)

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