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Publication Type J
Authors Ashraf, M. and M. I. Naqvi
Title Responses of 3 arid zone grass species to varying na/ca ratios in saline sand culture
Source New Phytologist
Abstract The effects on three grass species, Cenchrus pennisetiformis Hochst. & Steud., Leptochloa fusca (L.) Kunth. and Panicum turgidum Forssk., of decreasing Ca2+ concentration in a saline growth medium were assessed after 7 weeks growth in sand culture. The different Na/Ca ratios of the salt treatment were 24, 49, 99, and 199, at a constant concentration of 200 mol m-3. Leptochloa fusca produced the highest fresh and dry biomass, and was able to maintain Na+ and Cl- concentrations in the shoots and roots almost constant at varying external Na/Ca ratios, except that the shoot Na+ concentration increased significantly at the highest Na/Ca ratio. In C. pennisetiformis the shoot Na+ decreased, whereas the shoot Cl- concentration increased at the highest external Na/Ca ratio. But the root Na+ and Cl- concentrations in this species remained unchanged at varying Na/Ca ratios. C. pennisetiformis and L. fusca maintained almost constant K+ and Ca2+ concentrations in both shoots and roots at varying Na/Ca ratios. In P. turgidum the shoot K+ and shoot and root Ca2+ remained almost unchanged at all Na/Ca ratios, whereas the root K+ concentration decreased significantly but uniformly at the three higher Na/Ca ratios. No consistent pattern of increase or decrease was observed in the shoot and root Na/K and Na/Ca ratios of all the species. The shoot selectivity (S(K,Na)) increased consistently in C. pennisetiformis with the increase in Na/Ca ratios and it decreased in L. fusca only at the highest Na/Ca ratio in the growth medium. It was established that L. fusca was tolerant, C. penni-setiformis intermediate and P. turgidum relatively sensitive to low Ca2+ concentrations of the saline growth medium.
Author Address ASHRAF, M (reprint author), BAHAUD DIN ZAKARIYA UNIV,INST PURE & APPL BIOL,MULTAN,PAKISTAN.
ISSN 0028-646X
ISBN 0028-646X
29-Character Source Abbreviation New Phytol.
Publication Date Oct
Year Published 1991
Volume 119
Issue 2
Beginning Page 285-290
Digital Object Identifier (DOI) 10.1111/j.1469-8137.1991.tb01032.x
Unique Article Identifier WOS:A1991GM25900011
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