Screening trees for salinity tolerance: A case study with ten Eucalyptus species
2007
Nasim, M. (University of Agriculture, Faisalabad (Pakistan). Sub-Campus Depalpur) | Qureshi, R.H. (University of Agriculture, Faisalabad (Pakistan). Saline Agriculture Research Centre) | Aziz, T. | Saqib, M. | Nawaz, S. | Sahi, S.T. | Pervaiz, S.
The present solution culture experiments were conducted in a bid to screen ten eucalyptus species for their growth response to salinity in the rooting environment. Three months old seedlings were grown with and without 150mol m-3 NaCl salinity in a solution culture experiment for eight weeks. Species differed significantly for plant height, shoot and root dry weights at both salinity levels. Increased NaCl salinity significantly suppressed shoot and root biomass with varying degrees. Two species viz. E. camaldulensis (Salt sensitive) and E. occidentalis (Salt tolerant) were selected on the basis of their relative shoot dry weight. Both of these species were further grown in solution culture experiment to reconfirm growth response and ionic composition as affected by salinity stress. Absolute shoot and root biomass was significantly higher in E. camaldulensis as in the first experiment. Growth response of E. occidentalis to applied NaCl salinity was not consistent in this experiment as indicated by its relative shoot dry weight. The inconsistent behavior was attributed to higher temperature and relative humidity in second experiment, which aggravated the hazardous effects of salinity in this species. Increased NaCl salinity in root environment significantly increased Na+ and CI-1 concentration in leaves of both species. However, salinity did not affected K+ concentration significantly in E. occidentalis. E. camaldulensis although exhibited low relative production at high salinity yet performed better in terms of absolute growth at control as well as at 150mol m-3 NaCl salinity. Hence may be recommended to be used for rehabilitation of saline lands.
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