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Publication Type J
Authors Rakhmankulova, Z. F., P. Y. Voronin, E. V. Shuyskaya, N. A. Kuznetsova, N. V. Zhukovskaya and K. N. Toderich
Title Effect of NaCl and isoosmotic polyethylene glycol stress on gas exchange in shoots of the C-4 xerohalophyte Haloxylon aphyllum (Chenopodiaceae)
Source Photosynthetica
Author Keywords net photosynthetic rate osmotic stress oxidation proline salinity transpiration salt stress water-stress enzyme protectant rice seedlings co2 fixation photosynthesis proline tolerance plants halophytes
Abstract The effects of NaCl (200 mM) and osmotic stress generated by polyethylene glycol (PEG) on PSII maximal quantum efficiency, photosynthetic CO2/H2O gas exchange at two CO2 concentrations, content of chlorophyll, proline, and malondialdehyde were investigated in shoots of C-4 xerohalophyte Haloxylon aphyllum (Chenopodiaceae). The PEG treatment induced a low water osmotic potential (-0.4 MPa) and inhibited photosynthesis (by a factor of 2) and transpiration (by a factor of 4). The NaCl treatment, at equal osmoticity conditions, reduced transpiration (by a factor of 2) and stimulated photosynthesis (by a factor of 2.5). Only the PEG-treated plants showed osmotic stress effects, which were demonstrated by an increase in proline and malondialdehyde contents in the shoot tissue. The data indicated that the halophilic character of this species was essential for maintaining the plant water status and photosynthesis under osmoticity induced by NaCl treatment. Herewith, the presence of C-4-type photosynthesis appeared to be just an auxiliary mechanism, because this xerohalophyte did not reveal the efficiency in water use typical for C-4 plants under osmotic stress, in the absence of a saline substrate.
Author Address [Rakhmankulova, Z. F.; Voronin, P. Yu; Shuyskaya, E. V.; Kuznetsova, N. A.; Zhukovskaya, N. V.] Russian Acad Sci, KA Timiryazev Inst Plant Physiol, Moscow 127276, Russia. [Toderich, K. N.] Int Ctr Biosaline Agr ICBA, Tashkent 100000, Uzbekistan. Rakhmankulova, ZF (reprint author), Russian Acad Sci, KA Timiryazev Inst Plant Physiol, Bot Skaya 35, Moscow 127276, Russia. zulfirar@mail.ru
ISSN 0300-3604
ISBN 0300-3604
29-Character Source Abbreviation Photosynthetica
Publication Date Sep
Year Published 2014
Volume 52
Issue 3
Beginning Page 437-443
Digital Object Identifier (DOI) 10.1007/s11099-014-0048-3
Unique Article Identifier WOS:000340623800014
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