Biologia Plantarum

, Volume 62, Issue 3, pp 489–500 | Cite as

Physiological adaptation and gene expression analysis of Casuarina equisetifolia under salt stress

  • C. Fan
  • Z. Qiu
  • B. Zeng
  • X. Li
  • S. H. Xu
Original paper


Casuarina equisetifolia is widely planted in coastal areas of tropical and subtropical regions as windbreaks or to stabilize dunes against wind erosion due to its high salt tolerance and nitrogen-fixing ability. To investigate the mechanisms responsible for its salt tolerance, we examined growth, mineral composition, expression of genes for sodium (Na+) and potassium (K+) transport proteins, and antioxidant responses under NaCl treatments. Increasing NaCl concentrations inhibited lateral root elongation and decreased plant height, length of internodes, and numbers of branches and twigs. The Na+ content significantly increased whereas the K+ content significantly decreased in both shoots and roots with increasing external NaCl concentration, resulting in a significant increase in Na+/K+ ratio. Most of the Na+/H+ antiporter genes (NHXs) were obviously upregulated in roots after 24 and 168 h of salt stress, and NHX7 was especially induced after 168 h. Almost all salt overly sensitive (SOS) genes were induced after 168-h treatment. Additionally, activities of superoxide dismutase, glutathione peroxidase, and catalase were significantly changed in shoots and roots under salt stress. Hence, we conclude that salinity tolerance of C. equisetifolia mainly relied on sequestering excess Na+ into vacuoles and on induced expression of NHX and SOS genes in roots and thus the maintenance of sufficient K+ content in shoots.

Additional key words

antiporter genes catalase glutathione peroxidase ion homeostasis potassium salt overly sensitive sodium superoxide dismutase 









dry mass


electrical conductivity


fresh mass


glutathione reductase


glutathione peroxidase




Na+/H+ antiporters




quantitative PCR


superoxide dismutase


salt overly sensitive


water content


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Supplementary material

10535_2018_799_MOESM1_ESM.pdf (577 kb)
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Copyright information

© The Institute of Experimental Botany 2018

Authors and Affiliations

  1. 1.Research Institute of Tropical ForestryChinese Academy of ForestryGuangzhouP.R. China

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