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Publication Type J
Authors Khailova, G. F., L. G. Popova, L. G. Khalilova, N. A. Myasoedov and Y. V. Balnokin
Title Conversion of quaternary ammonium compounds in the whole plant system of the halophyte Suaeda altissima
Source Russian Journal of Plant Physiology
Author Keywords Suaeda altissima halophyte choline glycine betaine organ-specific localization salinity osmotic balance tertiary sulfonium compounds betaine synthesis glycinebetaine chloroplasts cloning enzyme barley
Abstract The total content of quaternary ammonium compounds (QAC) and the choline content in roots, leaves, and xylem exudates of the halophyte Suaeda altissima (L.) Pall. were determined after growing plants at various NaCl concentrations in the nutrient solution (1, 50, 100, and 250 mM). Based on the results obtained, the content of glycine betaine in organs and xylem exudates of S. altissima was estimated as the difference between the total content of QAC and the choline content. In roots choline accounted for the largest portion of QAC (from 69 to 96% at various NaCl concentrations in nutrient media), whereas in leaves it contributed only 12-23%. The contribution of choline to QAC content in the xylem exudates was 84-90%. It is concluded that choline in S. altissima is mainly synthesized in roots and is delivered with the ascending water flow to leaves where it is utilized as a substrate for glycine betaine synthesis. The content of glycine betaine in leaves increased with elevation of NaCl concentration in the nutrient solution, thus contributing appreciably to the maintenance of osmotic balance in the cytoplasm of S. altissima at high salinity.
Author Address [Khailova, G. F.; Popova, L. G.; Khalilova, L. G.; Myasoedov, N. A.; Balnokin, Yu V.] Russian Acad Sci, Timiryazev Inst Plant Physiol, Moscow 127276, Russia. [Balnokin, Yu V.] Moscow MV Lomonosov State Univ, Moscow, Russia. Khailova, GF (reprint author), Russian Acad Sci, Timiryazev Inst Plant Physiol, Bot Skaya Ul 35, Moscow 127276, Russia. lora_gp@mail.ru
ISSN 1021-4437
ISBN 1021-4437
29-Character Source Abbreviation Russ. J. Plant Physiol.
Publication Date Sep
Year Published 2014
Volume 61
Issue 5
Beginning Page 634-638
Digital Object Identifier (DOI) 10.1134/s1021443714050094
Unique Article Identifier WOS:000340941200007
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