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Journal of Agronomy

Year: 2006 | Volume: 5 | Issue: 2 | Page No.: 175-181
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Authors

S.A. Al-Khateeb

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Research Article

Effect of Calcium/Sodium Ratio on Growth and Ion Relations of Alfalfa (Medicago sativa L.) Seedling Grown under Saline Condition

S.A. Al-Khateeb
Growth and ionic concentrations of alfalfa (Medicago sativa L.) seedlings in response to interactive effects of different concentrations of Na+ (10, 50, 100 and 200 mol m-3) and Ca2+ (0, 5 and 10 mM) in growth media were studied. Dry weights of roots, stems and leaves were substantially declined with NaCl concentration increase, however, Ca2+ supplementation to the growth media alleviated the deteriorative effects of NaCl. Na+ and Cl¯ were significantly increased with increasing NaCl concentrations in all plant organs, but addition of Ca2+ had markedly reduced Na+ and Cl¯ content, particularly in roots. K+ was significantly reduced with increasing salinity level in roots and no clear trend was noticed in shoots. Ca2+ supplementation significantly increased K+ contents, particularly in roots. Ca2+ content was unchanged or slightly increased with increasing NaCl. However, K/Na and Ca/Na ratios were significantly decreased with increasing NaCl, but addition of Ca2+ had clearly altered the ratios to a positive increasing trend.
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