Abstract
Salinity stress affects plants by reducing the water potential and causing ion imbalance or disturbances in ion homeostasis and toxicity. Salinity stress frequently causes both osmotic and ionic stress in plants, resulting in the increase or decrease of certain secondary metabolites in plants. In this study, the effect of NaCl treatment on the nutritional quality of tartary buckwheat plants was studied by conducting an HPLC analysis of phenylpropanoid and anthocyanin content. It was observed that there was no significant change of color in tartary buckwheat during salt treatment. The accumulation of most phenylpropanoid compounds increased slightly in response to the NaCl concentration. The total phenylpropanoid content in tartary buckwheat was the highest at 100 mM NaCl treatment. Seven-day-old wheat plantlets treated with 100 mM NaCl for 2, 4, 6, and 8 days showed the highest accumulation of total phenylpropanoids at day 8 after treatment, while the content of most phenylpropanoids was higher than that in the control during this period. Although the development of tartary buckwheat slightly decreased with NaCl treatment and the accumulation of anthocyanin compounds did not change in plants with a diffident NaCl concentration and time treatment, the results suggest that the salinity treatment of tartary buckwheat causes antioxidant activity improvement by inducing an accumulation of flavonoid and phenolic compounds. However, since the anthocyanin content did not increase, the antioxidant effect of the treatment is not expected to be significant.
Highlights
High salinity stress induces osmotic stress and removes water from the cytoplasm, causing cell dehydration, which reduces the vacuole volume and cytoplasm
To find out whether tartary buckwheat plants are influenced by salinity stress, we examined the phenotype of tartary buckwheat after 4 weeks of treatment with different concentrations of NaCl
The development of tartary buckwheat treated by NaCl was decreased with an increase in NaCl concentration from 0 to 300 mM
Summary
High salinity stress induces osmotic stress and removes water from the cytoplasm, causing cell dehydration, which reduces the vacuole volume and cytoplasm. It is required for plants to cope with two main kinds of stress, namely, ionic stress and osmotic stress against high salinity. Osmotic stress indicates that salinity levels rise outside the roots and immediately reach the plant by inhibiting water ingestion, cell swelling, and subsequent bud development [1]. Ionic stress results from an excess of toxic ions, such as Na+ , which leads to an increase in the chlorophyll content and necrosis of leaves and a decrease in essential cell metabolic activities, including photosynthesis [1,2]. Salinity stress frequently causes both osmotic and ionic stress in plants, resulting in an increase or decrease of certain secondary. Anthocyanins have been reported to accumulate under salinity stress [4]
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