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Pakistan Journal of Biological Sciences
Year: 2007  |  Volume: 10  |  Issue: 22  |  Page No.: 4081 - 4086

Sodium and Proline Accumulation as Osmoregulators in Tolerance of Sugar Beet Genotypes to Salinity

H. Pakniyat and M. Armion    

Abstract: Twenty eight sugar beet genotypes were analysed for their tolerance at 3 NaCl levels (0, 3000 and 6000 mg NaCl kg‾ 1 soil) and Na+, K+, Na+/K+ and free proline were measured from the leaf samples. Results showed that increasing salinity level caused an increase in Na+, Na+/K+ and proline, but a decrease in K+ content of leaf samples (p ≤0.01). As compared to non-tolerant genotypes, tolerant ones accumulated more Na+ and Na+/K+ and proline and less K+. It seems that Na+ and proline accumulation in shoots are effective mechanisms for osmotic pressure adjustment and plant tolerance to salinity, a mechanism commonly seen in sugar beet ancestors.

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