Salinity effects on physiological and phytochemical characteristics and gene expression of two Glycyrrhiza glabra L. populations.

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ID: 79259
2020
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Abstract
Glycyrrhiza glabra (licorice) is a medicinal plant with valuable specialised metabolites such as triterpene sweetener glycyrrhizin. Salinity stress is the main environmental stress limiting plant growth and development. The effects of six levels of NaCl (0, 100, 200, 400, 600, and 800 mM) on growth, osmolyte content, oxidative stress markers, antioxidant enzyme activities, K/Na ratio, glycyrrhizin content, and gene expression of glycyrrhizin biosynthesis (bAS, CYP88D6, and CYP72A154) were investigated in licorice rhizomes of two populations. The results showed that the salt stress progressively reduced the growth parameters and increased the proline concentrations in the rhizomes. K/Na ratio showed a significant decrease under salinity as compared to the controls. Salt stress resulted in oxidative stress on the rhizomes, as indicated by increased lipid peroxidation and hydrogen peroxide concentrations and elevated the activities of antioxidant enzymes (i.e., ascorbate peroxidase and superoxide dismutase). The glycyrrhizin content increased only under 100 and 200 mM NaCl treatments. The same trend was observed in the expression of bAS, CYP88D6, and CYP72A154 genes in Fars population. Fars population was found to have more glycyrrhizin content than Khorasan population. But, growth, glycyrrhizin content, and biosynthesis genes of glycyrrhizin showed more reduction in Khorasan population as compared to those of Fars population. The results indicate that the application of 100 mM NaCl up-regulated the expression of key genes involved in the biosynthesis of triterpenoid saponins and directly enhanced the production of glycyrrhizin. Accordingly, G. glabra can be introduced as a halophyte plant.
Reference Key
behdad2020salinityphytochemistry Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Behdad, Assieh;Mohsenzadeh, Sasan;Azizi, Majid;Moshtaghi, Nasrin;
Journal Phytochemistry
Year 2020
DOI
S0031-9422(19)30890-8
URL
Keywords
gene expression reactive oxygen species salt stress fabaceae glycyrrhiza glabra glycyrrhizin k(+)/na(+) ratio triterpenoid

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