2007•Pakistan Journal of Biological SciencesOpen access

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

Hassan Pakniyat, 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 < or = 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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Key concepts: Proline, Sugar beet, Salinity, Shoot, Sugar, Sodium, Chemistry, Horticulture