Seed germination is critical for successful crop production and this growth stage can be very sensitive to salt stress depending on the plant's tolerance mechanisms. The pretreatment of Chenopodium quinoa (quinoa) seeds with CaCl2, H2O2 and sodium nitroprusside (SNP) limited the adverse effect of salt stress on seed germination. The pre-treated seeds showed a significant increase in germination rate, relative germination rate and germination index while the mean germination time was significantly reduced under both optimal and stress conditions. In parallel with seed germination, the negative effect of salt stress on the activity of α-amylase and β-amylase was reduced in pre-treated seeds. The amylase enzymes are responsible for starch hydrolysis, so the reduction of amylase activity by salt stress resulted in higher starch content in the seeds and lower concentrations of water-soluble sugars such as glucose. Pretreatment stimulated amylase activity resulting in starch breakdown and increased content of water-soluble sugars in the salt-stressed seeds. Protein and amino acid contents were significantly enhanced in salt-stressed seeds, which were highlighted in pre-treated seeds. The findings of this study demonstrate that pretreatment of quinoa seeds with CaCl2, H2O2 and SNP at 5, 5 and 0.2 mM, respectively, concentration to achieve rapid germination at high levels under optimal and salt-stress conditions.

Department of Plant Physiology Faculty of Agrobiology Food and Natural Resources Czech University of Life Sciences 16500 Prague Czech Republic

Department of Plant Physiology Faculty of Agrobiology Food and Natural Resources Czech University of Life Sciences 16500 Prague Czech Republic; Department of Botany and Plant Physiology Faculty of Agrobiology and Food Resources Slovak University of Agriculture 94976 Nitra Slovakia

Plant Biology Department Faculty of Science Behbahan Khatam Alanbia University of Technology Khuzestan 47189 63616 Iran

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