Calcium application mitigates salt stress in Date Palm (Phoenix dactylifera L.( offshoots cultivars of Berhi and Sayer
2016
Abbas M. JASIM | Muayed F. ABBAS | Hussein J. SHAREEF
The effectiveness of exogenous application of calcium in ameliorating the adverse effects of salt stress (15.9 dS m-1) on date palm offshoots (Phoenix dactylifera L. cultivars of Berhi and Sayer) was investigated. Ca-fertilisers Polixal and Rexene were applied either as soil amendments or foliar spray. The results showed that Polixal at 30 ml offshoot-1 significantly increased plant height, leaf area, total chlorophyll content, RWC, proline concentration, peroxidase activity, IAA content, K+ and K+/Na+ ratio in leaves of Berhi cultivar, whereas catalase activity, ABA and Cl- content were decreased. Also Berhi cultivar responded to soil amendments more than to foliar spray. However, Ca-fertilisers mitigated salt stress in the two cultivars and Berhi cultivar was more salt stress tolerant than Sayer cultivar by maintaining the high ratio of K+/Na+ and regulating levels of IAA to ABA, in silty clay loam soil. These results suggest that calcium application can improve the defense system under salt stress conditions.
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