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Original Articles

Effects of Salinity on Growth, Ionic Relations and Solute Content of Sorghum Bicolor (L.) Monench

, &
Pages 1219-1236 | Received 17 Jan 2007, Accepted 05 Jan 2009, Published online: 06 Jun 2009
 

ABSTRACT

The effects of increasing levels of calcium (Ca2+), potassium (K+), and sodium chloride (NaCl) salinity on the growth and ionic relations of Sorghum bicolor (L.) Monench, cv. ‘ICI-5521’ seedlings are reported. Increasing levels of Ca2+ in the solution culture enhanced growth, lowered sodium (Na+) uptake, and increased K+:Na+ ratio significantly. Elevated K+ level also improved growth significantly, but had no significant effect on Na+, Ca2+, or magnesium (Mg2+) accumulation of either roots or shoots. Accumulation of K+ and consequently K+:Na+ ratio increased with external K+ concentration. The effects of sodium chloride (NaCl) versus potassium chloride (KCl) salinity on the growth and ionic relations of sorghum (‘ICI-5521’) were also examined. Growth inhibition was greatest when KCl alone (160 mM) was used, but was enhanced when a mixture of NaCl and KCl (15:1) was used. The influence of salinity on the accumulation of proline, amino acids and carbohydrates and total osmolality is also discussed.

ACKNOWLEDGMENTS

The help of Professors A. B. Tomsett, The University of Liverpool, and F. M. Azhar, UAF for making some valuable suggestions for improving the manuscript is gratefully acknowledged.

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