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<p><i>Crithmum maritimum</i> is an edible halophyte plant that is not only able to tolerate a high rate of salinity but also to survive and grow normally in hypersaline environments. The present study evaluates how nitrogen metabolism is involved in the salt stress response in halophytes. The plants previously cultured for 15 days in a basal medium were subjected to various concentrations of NaCl (0, 100, 200 and 300 mM) for a period of one month. Other plants were exposed to 300 mM of NaCl for three weeks, and then placed once again in basic culture medium without NaCl (R) for one week. The results showed that <i>Crithmum maritimum</i> could tolerate 100 mM of NaCl with efficient carbon and nitrogen assimilation. In addition, applying 100 mM NaCl induced asparagine synthetase protein, correlating to an increase in asparagine levels recorded in the shoots. However, salinity's inhibitory effect intensified when halophytes were treated with 300 mM NaCl. This caused progressive reduction of nitrogen-assimilating enzymes (nitrate reductase, nitrite reductase, and glutamate synthase). Interestingly, transferring plants previously treated with 300 mM NaCl to a basic control medium allowed plants to partially recover their growth and nitrogen metabolism status.</p>

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Salinity Tolerance of Crithmum maritimum L. Seedlings Linked to Nitrogenous Compound Production

  • 期刊论文

  • 发表日期：

    2025年8月3日

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  • Khaled Mguis,
  • Mejda Abassi,
  • Hanen Enneb,
  • Ali Albouchi,
  • Chiraz Chaffei-Houari

摘要

Crithmum maritimum is an edible halophyte plant that is not only able to tolerate a high rate of salinity but also to survive and grow normally in hypersaline environments. The present study evaluates how nitrogen metabolism is involved in the salt stress response in halophytes. The plants previously cultured for 15 days in a basal medium were subjected to various concentrations of NaCl (0, 100, 200 and 300 mM) for a period of one month. Other plants were exposed to 300 mM of NaCl for three weeks, and then placed once again in basic culture medium without NaCl (R) for one week. The results showed that Crithmum maritimum could tolerate 100 mM of NaCl with efficient carbon and nitrogen assimilation. In addition, applying 100 mM NaCl induced asparagine synthetase protein, correlating to an increase in asparagine levels recorded in the shoots. However, salinity's inhibitory effect intensified when halophytes were treated with 300 mM NaCl. This caused progressive reduction of nitrogen-assimilating enzymes (nitrate reductase, nitrite reductase, and glutamate synthase). Interestingly, transferring plants previously treated with 300 mM NaCl to a basic control medium allowed plants to partially recover their growth and nitrogen metabolism status.