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Publication Type J
Authors Balnokin, Y. V., N. A. Myasoedov, Z. S. Shamsutdinov and N. Z. Shamsutdinov
Title Significance of Na+ and K+ for sustained hydration of organ tissues in ecologically distinct halophytes of the family Chenopodiaceae
Source Russian Journal of Plant Physiology
Author Keywords Atriplex micrantha; Climacoptera lanata; Salicornia europaea; halophytes; different ecological groups; salt resistance; ion accumulation; tissue hydration level x-ray-microanalysis; salt tolerance; ion homeostasis; stress; cells; mechanisms; responses; sodium; leaves
Abstract The contents of Na+, K+, water, and dry matter were measured in leaves and roots of euhalophytes Salicornia europaea L. and Climacoptera lanata (Pall.) Botsch featuring succulent and xeromorphic cell structures, respectively, as well as in saltbush Atriplex micrantha C.A. Mey, a halophyte having bladder-like salt glands on their leaves. All three species were able to accumulate Na+ in their tissues. The Na+ content in organs increased with elevation of NaCl concentration in the substrate, the concentrations of Na+ being higher in leaves than in roots. When these halophytes were grown on a NaCl-free substrate, a trend toward K+ accumulation was observed and was better pronounced in leaves than in roots. Particularly high K+ concentrations were accumulated in Salicornia leaves. There were no principal differences in the partitioning of Na+ and K+ between organs of three halophyte species representing different ecological groups. At all substrate concentrations of NaCl, the total content of Na+ and K+ in leaves was higher than in roots. This distribution pattern persisted in Atriplex possessing salt glands, as well as in euhalophytes Salicornia and Climacoptera. The physiological significance of such universal pattern of ion accumulation and distribution among organs in halophytes is related to the necessity of water absorption by roots, its transport to shoots, and maintenance of sufficient cell water content in all organs under high soil salinity.
Author Address Russian Acad Sci, Timiryazev Inst Plant Physiol, Moscow 127276, Russia. Russian Acad Agr Sci, Williams All Russia Fodder Res Inst, Moscow, Russia. Russian Acad Agr Sci, Kostyakov A Russia Res Inst Hydraul Engn & Land R, Moscow, Russia. Balnokin, YV, Russian Acad Sci, Timiryazev Inst Plant Physiol, Botanicheskaya 35, Moscow 127276, Russia. balnokin@yandex.ru
29-Character Source Abbreviation Russ. J. Plant Physiol.
Publication Date Nov-Dec
Year Published 2005
Volume 52
Issue 6
Beginning Page 779-787
Unique Article Identifier ISI:000233618200010
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