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- Title
Effect of NaCl and isoosmotic polyethylene glycol stress on gas exchange in shoots of the C xerohalophyte Haloxylon aphyllum (Chenopodiaceae).
- Authors
Rakhmankulova, Z.; Voronin, P.; Shuyskaya, E.; Kuznetsova, N.; Zhukovskaya, N.; Toderich, K.
- Abstract
The effects of NaCl (200 mM) and osmotic stress generated by polyethylene glycol (PEG) on PSII maximal quantum efficiency, photosynthetic CO/HO gas exchange at two CO concentrations, content of chlorophyll, proline, and malondialdehyde were investigated in shoots of C 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-type photosynthesis appeared to be just an auxiliary mechanism, because this xerohalophyte did not reveal the efficiency in water use typical for C plants under osmotic stress, in the absence of a saline substrate.
- Subjects
POLYETHYLENE glycol; GAS exchange in plants; HALOXYLON; EFFECT of salt on plants; PHOTOSYNTHETIC rates; OSMOSIS; PLANTS
- Publication
Photosynthetica, 2014, Vol 52, Issue 3, p437
- ISSN
0300-3604
- Publication type
Article
- DOI
10.1007/s11099-014-0048-3