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Effect of blue- green algae and tragacanth seed coating in maize under salinity stress
Mahsa Soltani, Niloofar Mostafavi, Mohamad Reza Ghalamboran, Seyedeh Batool Hasssani, Françoise Bernard

Abstract
Soil salinity gradually become a major problem in arid and semi-arid regions of the world. Seed coating through bio-materials is a new method that maintains humidity around the seed. The aim of this study is to use absorbing bio-compounds to increase the percentage of germination and improving growth of Zea mays L. under salt stress. The experiment was conducted with maize seed which coated with tragacanth, tragacanth + Anabaena and tragacanth + Pseudo anabaena when exposed to 0, 120 and 160 mM NaCl per kg of coco-peat. All seed treatments effectively promoted seed germination percentage in 160 mM NaCl. Seed coating with tragacanth led to a significant increase of growth indices compared to the non-coated seeds under salt stress. While, the combination of tragacanth with Anabaena or Peusodoanabaena reduced the growth parameters. Coating treatment of maize seeds resulted in decreasing of Na content in the plants compared to the plants from non-coated seeds. The results suggested that maize seed coating with tragacanth could improve Na tolerance in the plants associated with a positive regulation of the seed germination and plant growth.
Keywords
Trifolium alexandrinum L., Tragacanth gum, Pseudo anabaena, Anabaena

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