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Seed germination, seedling survival, and physiological response of sunflowers under saline and alkaline conditions

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Photosynthetica

Abstract

Salinization and alkalization of soil are widespread environmental problem and the alkali stress is more destructive than the effects caused by salt stress. To compare the mechanism of salt and alkali stresses, a sunflower variety (Helianthus annuus L. cv. Baikuiza 6) was tested under saline or alkaline conditions by mixing two neutral salts (NaCl and Na2SO4) or two alkaline salts (NaHCO3 and Na2CO3). The results showed that saline conditions differed greatly from alkaline conditions in their threshold intensities where sunflower can germinate, survive and grow. Under saline conditions, the emergence time was delayed, and the emergence rate and seedling survival rate also decreased with increasing salinity. However, under alkaline conditions, the rate of seedling survival decreased sharply but the emergence time and emergence rate did not change. In addition, the damaging effects of alkali stress on growth and photosynthesis were more severe than those of saline. In shoots, the main inorganic osmolyte and cation was K+ rather than Na+; the primary organic osmolytes were organic acid and soluble sugar rather than proline. Organic acid, NO3 −, and Cl− (only under saline condition) were the main source of anion. In addition, the osmotic adjustment and ion balance differed among sunflower roots, stems, and leaves. In conclusion, saline and alkaline conditions are two different stress conditions and there are special responses to two stress conditions for sunflower.

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Abbreviations

C i :

intercellular CO2 concentration

E :

transpiration rate

g s :

stomatal conductance

P N :

net photosynthetic rate

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Acknowledgments

This work was supported by grants from the National Natural Science Foundation of China (No. 30671491). We thank International Science Editing (ISE) from Ireland for language editing.

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  1. School of Life sciences, Northeast Normal University, Changchun, 130024, Jilin Province, China

    J. Liu, W. Q. Guo & D. C. Shi

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  1. J. Liu
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  2. W. Q. Guo
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  3. D. C. Shi
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Correspondence to D. C. Shi.

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Liu, J., Guo, W.Q. & Shi, D.C. Seed germination, seedling survival, and physiological response of sunflowers under saline and alkaline conditions. Photosynthetica 48, 278–286 (2010). https://doi.org/10.1007/s11099-010-0034-3

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  • DOI: https://doi.org/10.1007/s11099-010-0034-3

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