Journal of Rangeland

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Salinity is one of the most important limiting factors for plant growth and production in the world. Identification and application of materials and compounds, which are able to reduce the negative effects of salinity, are very important. A completely randomized factorial design was used to investigate the effects of spermidine on some morphological and physiological characteristics of Calotropis procera seedlings under salinity stress. Five levels of salinity (0, 5, 10, 15, and 20 dS/m) and three levels of spermidine (0, 1, and 2 mM) in four replicates were tested in the greenhouse. Results showed that increasing salinity level to 15 dS/m, decrease the fresh and dry weight of seedling and root, leaf area, viability percentage and chlorophyll content of the species. Salinity of 20 dS/m caused the death of seedlings. Increasing salinity level leads to increase proline content in the species. Although increasing salinity to 10 dS/m causes an increase in enzyme activity of superoxide dismutase, peroxidase, catalase and ascorbate peroxidase, Anzyms activities were decreased on the salinity of 15 dS/m. The fresh and dry weight of seedling and root, leaf area were improved significantly by adding spermidine to the soil. This compound also leads to an increase in antioxidant enzymes activities under salinity stress. The best treatment of spermidine was 2 mM for decreasing destructive effects of salinity on the growth status of the species.
 

Keywords: Antioxidant, Proline, Polyamine, Salinity, Chlorophyll.

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