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Effects of External Concentration of (K+ + Na+) and K+/Na+ on the Growth and Ion Relations of Atriplex amnicola

Aslam, Z., Barrett-Lennard, E.G. and Greenway, H. (1988) Effects of External Concentration of (K+ + Na+) and K+/Na+ on the Growth and Ion Relations of Atriplex amnicola. Journal of Plant Physiology, 133 (2). pp. 228-234.

Link to Published Version: https://doi.org/10.1016/S0176-1617(88)80142-1
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Abstract

This paper reports on the growth and ion relations of Atriplex amnicola in response to different K+/ Na+ in nutrient solutions containing either 40 or 400 mol m-3 (K+ + Na+)C1-. Growth was substantially lower at 400 than at 40 mol m-3 external (K+ + Na+)Cl-. At 40 mol m-3 (K+ + Na+)Cl-, growth of A. amnicola did not differ at K+/Na+ of 0.025, 0.333, and 1.0 in the nutrient solution. At 400 mol m-3 (K+ + Na+)Cl , growth was substantially decreased at a K+/Na+ of 1.0 in the nutrient solution compared with lower K+/Na+.

Although the [K+] and [Na+] in different plant parts were related to the K+/Na+ in the external solution, the [K+ + Na+] was generally not affected by K+/Na+ in the external medium. The single exception to this observation was at 400 mol m-3 (K+ + Na+)Cl-, when the [K+ +Na+] in the shoots was substantially higher at a K+/Na+ of 1.0 than at lower K+/Na+. In general, K+/Na+ was highest in the apical root segments (10–12 mm long), lower in the bulk roots and lowest in the leaves.

Item Type: Journal Article
Publisher: Elsevier GmbH
Copyright: © 1988 Gustav Fischer Verlag, Stuttgart.
URI: http://researchrepository.murdoch.edu.au/id/eprint/43611
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