University of Guilan Iranian Journal of Seed Sciences and Research 2476-3780 11 3 2024 09 22 Effect of seed priming with gibberellin on germination characteristics and antioxidant enzyme activity in quinoa (chenopodium quinoa willd) seedlings under salinity stress Effect of seed priming with gibberellin on germination characteristics and antioxidant enzyme activity in quinoa (chenopodium quinoa willd) seedlings under salinity stress 21 35 8790 10.22124/jms.2024.8790 FA Haniyeh Saadat Ph.D. Ecology of Crop Plants, University of Mohaghegh Ardabili Mohammad Sedghi Professor of Agriculture Department, Faculty of Agriculture, University of Mohaghegh Ardabili Journal Article 2024 12 07 In order to investigate the Effect of seed priming with gibberellin on germination characteristics and antioxidant enzyme activity in quinoa seedlings under salinity stress and an experiment was conducted based on completely randomized design arranged in factorial with three replications at University of Mohaghegh Ardabili Laboratory in 2024. Treatments were four salinity levels (0, 150, 300 and 450 mM Derived from NaCl) and four levels of gibberellin (0, 100, 150 and 200 mgL^-1). The results showed that salinity stress reduced Germination Rate, Radicle length, Plumule length and seedling length. But priming with distilled water, different levels of gibberellin, especially the 200 mgL^-1 level, improved these traits. daily germination coefficient and mean germination time were higher about 15% and 65%, respectively, compared to the control treatment without salinity and in priming with gibberellin 200 mgL^-1 compared to the control, they showed a decrease of about 8% and 42%, respectively. The catalase and ascorbate peroxidase enzymes activity in the treatment with control and 450 mM salinity compared to with gibberellin 200 mgL^-1 and without salinity showed an increase of about 86 and 92%, respectively. The activities of peroxidase and superoxide dismutase enzymes in gibberellin 200 mgL^-1 treatment showed a decrease of about 25% and 34%, respectively, compared to the control. Also, the alpha-amylase enzyme activity in priming with gibberellin 200 mgL^-1 and without salinity compared to the the controland 450 mM salinity showed an increase of 89%, respectively. The results showed that seed treatment with different levels of gibberellin can reduce the harmful effects of salinity on some traits quinoa seedlings and improve seedling growth. In order to investigate the Effect of seed priming with gibberellin on germination characteristics and antioxidant enzyme activity in quinoa seedlings under salinity stress and an experiment was conducted based on completely randomized design arranged in factorial with three replications at University of Mohaghegh Ardabili Laboratory in 2024. Treatments were four salinity levels (0, 150, 300 and 450 mM Derived from NaCl) and four levels of gibberellin (0, 100, 150 and 200 mgL^-1). The results showed that salinity stress reduced Germination Rate, Radicle length, Plumule length and seedling length. But priming with distilled water, different levels of gibberellin, especially the 200 mgL^-1 level, improved these traits. daily germination coefficient and mean germination time were higher about 15% and 65%, respectively, compared to the control treatment without salinity and in priming with gibberellin 200 mgL^-1 compared to the control, they showed a decrease of about 8% and 42%, respectively. The catalase and ascorbate peroxidase enzymes activity in the treatment with control and 450 mM salinity compared to with gibberellin 200 mgL^-1 and without salinity showed an increase of about 86 and 92%, respectively. The activities of peroxidase and superoxide dismutase enzymes in gibberellin 200 mgL^-1 treatment showed a decrease of about 25% and 34%, respectively, compared to the control. Also, the alpha-amylase enzyme activity in priming with gibberellin 200 mgL^-1 and without salinity compared to the the controland 450 mM salinity showed an increase of 89%, respectively. The results showed that seed treatment with different levels of gibberellin can reduce the harmful effects of salinity on some traits quinoa seedlings and improve seedling growth. https://jms.guilan.ac.ir/article_8790_b7d72aee838c580b862286d9c79cd3ca.pdf