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Comparative effects of salt and alkali stresses on growth, osmotic adjustment and ionic balance of an alkali-resistant halophyte Suaeda glauca (Bge.)

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Abstract

Effects of salt and alkali stresses on growth, osmotic adjustment and ionic balance of Suaeda glauca (Bge.), an alkali-resistant succulent halophyte, were compared. The results showed that alkali stress clearly inhibited the growth of S. glauca. Moreover, the concentrations of Na+ and K+ both increased with increasing salinity under both stresses, suggesting no competitive inhibition between absorptions of Na+ and K+. The mechanism underlying osmotic adjustment during salt stress was similar to alkali stress in shoots. The shared essential features were that organic acids, betaine and inorganic ions (dominated by Na+) mostly accumulated. On the other hand, the mechanisms governing ionic balance under both stresses were different. Under salt stress, S. glauca accumulated organic acids and inorganic anions to maintain the intracellular ionic equilibrium, but the anion contribution of inorganic ions was greater than that of organic acids. However, the concentrations of inorganic anions under alkali stress were significantly lower than those under salt stress of the same intensity, suggesting that alkali stress might inhibit uptake of anions, such as NO3 and H2PO4 . Under alkali stress, organic acids were the dominant factor in maintaining ionic equilibrium. The contribution of organic acids to anions was 74.1%, while that of inorganic anions was only 25.9%. S. glauca enhanced the synthesis of organic acids, dominated by oxalic acid, to compensate for the shortage of inorganic anions.

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Abbreviations

DW:

Dry weight

FW:

Fresh weight

OA:

Organic acid

OXA:

Oxalic acid

RGR:

Relative growth rate

SS:

Soluble sugars

WC:

Water content

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Acknowledgments

This work was supported by grants from the National Natural Science Foundation of China (Nos. 30671491 and 30571318), and partly from the National Key Basic Research Program of China (2007CB106800).

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Correspondence to Decheng Shi.

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Yang, C., Shi, D. & Wang, D. Comparative effects of salt and alkali stresses on growth, osmotic adjustment and ionic balance of an alkali-resistant halophyte Suaeda glauca (Bge.). Plant Growth Regul 56, 179–190 (2008). https://doi.org/10.1007/s10725-008-9299-y

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