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  • Title: Root growth and lignification of two wheat species differing in their sensitivity to NaCl, in response to salt stress.
    Author: Jbir N, Chaïbi W, Ammar S, Jemmali A, Ayadi A.
    Journal: C R Acad Sci III; 2001 Sep; 324(9):863-8. PubMed ID: 11558333.
    Abstract:
    Application of a 100-mM NaCl salt stress to wheat seedlings of a salt-tolerant (Triticum durum var. Ben Béchir) and a salt-sensitive (Triticum aestivum var. Tanit) species decreases the fresh and dry weights of roots especially in the salt-sensitive species, and slightly increases the ratio of dry to fresh weight, especially in the salt-resistant species. All peroxidase activities are increased by salt stress, the water-soluble peroxidase activity being increased much more in the salt-sensitive than in the salt-tolerant species, while the opposite result is observed with the cell-wall peroxidase activity. Some water-soluble peroxidases have been hypothesised to have auxin oxidase activity (which might explain the effect observed on the root biomass), while the cell-wall peroxidases would be involved in lignification. Histochemical observation confirms a more intense lignification in the root cells of the salt-tolerant species compared to the sensitive species, under the effect of NaCl.
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