Volume 14, Issue 68 (vol. 14, no. 68 2025)
2025, 14(68): 1-18 |
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Sharifi M, Shariati M, Hosseini Tafreshi S A. Effect of Dunaliella algal extracts on growth and salt stress response
in rice plants. Plant Process and Function 2025; 14 (68) : 1
URL: http://jispp.iut.ac.ir/article-1-2212-en.html
URL: http://jispp.iut.ac.ir/article-1-2212-en.html
1- Department of Plant and Aninmal Biology, Faculty of Science and Technology, University of Isfahan, Iran
2- Department of Plant and Aninmal Biology, Faculty of Science and Technology, University of Isfahan, Iran ,mansour@sci.ui.ac.ir
3- Department of Biotechnology, Faculty of Chemistry, University of Kashan, Iran
2- Department of Plant and Aninmal Biology, Faculty of Science and Technology, University of Isfahan, Iran ,
3- Department of Biotechnology, Faculty of Chemistry, University of Kashan, Iran
Abstract: (177 Views)
Salinity is a major threat to crop production and global food security. Algae and their extracts containing bioactive compounds can increase plants' tolerance to abiotic stress, including salt stress. This research was conducted in two stages of experiments. In the first stage, five different salt concentrations (0, 50, 100, 150, and 200 mM NaCl) were applied to rice plants. According to the growth indicators evaluations, 150 mM NaCl concentration was selected. In the second stage, concentrations of 0.1, 1, and 2% of Dunaliella bardawil algae and Dunaliella salina algae extracts were prepared separately. The plant leaves were sprayed four times, once a day. Then the plants were subjected to 150 mM salt stress for 14 days. Then, the leaf sampling was done, and some physiological and biochemical indicators were measured. The results indicated that after applying the salt stress, the plants treated with the algal extracts showed significant growth in the stem and root biomass and the relative chlorophyll content (SPAD) of the leaves compared to the control, which were not treated with algal extracts. The use of microalgae extracts following salinity stress caused an increase in photosynthetic pigments, carotenoids, and relative water content, and also increased the accumulation of compatible osmolytes such as proline, glycine-betaine, and soluble carbohydrates. The amount of malondialdehyde, as a membrane lipid peroxidation indicator, increased in plants under salt stress. Algal extracts decreased the malondialdehyde elevation and increased the activity of two antioxidant enzymes, catalase and ascorbate peroxidase. Microalgae extracts preserve intracellular contents by reducing electrolyte leakage from the membrane under salt stress conditions, which indicates the active role of Dunaliella salina and Dunaliella bardawil extracts in re-establishing ion homeostasis. In general, it was found that the extract of microalgae, probably due to the presence of nutrients and growth stimulants, improved the plant growth, performance, and tolerance under salt stress conditions. It seems that an alternative way in organic agriculture is to use the microalgae extract, especially in higher concentrations, as biofertilizers instead of chemical fertilizers.
Article number: 1
Type of Study: Research |
Subject:
Salt Stress
Received: 2025/05/14 | Accepted: 2025/07/8 | Published: 2025/10/29
Received: 2025/05/14 | Accepted: 2025/07/8 | Published: 2025/10/29
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