Abstract
The morphological, biochemical and genetic characteristics of two Bassia sedoides (Chenopodiaceae) populations in the Southern Urals were studied. The plants of the Makan and Podolsk populations differ in growth (approximately 10-fold), in water and potassium contents and Na+/K+ ratio. On the basis of the genetic assay (by isozymes, RAPD and ISSR markers) of B. sedoides from the Makan and Podolsk populations, the intraspecific differences have been identified. The more productive Makan population showed greater genetic polymorphism, whereas the less productive Podolsk population showed less genetic polymorphism. The seedlings of B. sedoides from the Makan and Podolsk populations were cultivated under low and moderate salinity (100 and 200 mM NaCl, respectively) and equivalent osmoticity generated by the two PEG concentrations. Both populations were sensitive to dehydration initiated by PEG. Podolsk seedlings were more sensitive to osmotic stress and were characterised by an increase in proline content. Low salinity (100 mM NaCl) was necessary for optimal growth of seedlings from the Makan population. They showed significantly increased fresh biomass and number of lateral shoots. The maximal growth of seedlings from Podolsk was under 0–100 mM NaCl, and their biomass was approximately 1.4-fold lower than that of the Makan seedlings. Under moderate salinity (200 mM NaCl), the Makan seedlings were more salt tolerant than the Podolsk seedlings because of maintaining a low Na+/K+ ratio. Under natural conditions, the excess of Na+/K+ ratio compared with values for optimal growth under laboratory conditions was approximately threefold for the Makan plants and approximately fivefold for the Podolsk plants. High values of the Na+/K+ ratio under natural conditions indicate a deficit of potassium in the soil. Perhaps, the degree of potassium deficiency is one of the factors influencing the differences in productivity and the level of genetic variation of B. sedoides under natural conditions.
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Acknowledgments
This work was partially supported by the Russian Foundation for Basic Research (project no. 12_04_97023_r_a). The authors would like to thank Enago (www.enago.com) for the English language review.
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Communicated by K. Apostol.
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Shuyskaya, E., Rakhmankulova, Z., Voronin, P. et al. Salt and osmotic stress tolerances of the C3–C4 xero-halophyte Bassia sedoides from two populations differ in productivity and genetic polymorphism. Acta Physiol Plant 37, 236 (2015). https://doi.org/10.1007/s11738-015-1981-x
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DOI: https://doi.org/10.1007/s11738-015-1981-x