Evaluation the effects of salinity stress and vermicompost on morphophysiological traits of Euphorbia tirucalli L.

Document Type : scientific research article

Authors

1 Dept. of Biology, Gorgan Branch, Islamic Azad University, Gorgan, Iran.

2 Corresponding Author, Dept. of Biology, Gorgan Branch, Islamic Azad University, Gorgan, Iran.

Abstract

Background and objective: Vermicompost increases the ability to absorb water and has a great effect on improving the physical, chemical, and biological properties of the soil. The present study investigates the effects of salinity stress and vermicompost on Euphorbia tirucalli L.in pot culture conditions.
Materials and methods: Plants were cultivated under three salinity treatments of 4, 8 and 12 dsm-1 alone and with the use of vermicompost at the levels of 10, 20 and 30 % of the soil were tested factorially in the form of a completely randomized design. Growth parameters including length, dry and fresh weight (whole plant, root and shoot) and content of photosynthetic and non-photosynthetic pigments, soluble sugars and proline were measured in the plant.
Results: According to the obtained results, the increase in salinity levels had a negative effect on the growth parameters, while the combined use of vermicompost fertilizer increased the length and dry weight of aerial parts at all salinity levels. Regarding the root dry weight, an upward trend was observed at the highest salinity level (12 dsm-1) at all vermicompost the use of levels. According to the results of this research, the use of salinity stress reduced chlorophyll pigments, but the use of vermicompost fertilizer at the highest level (30 percent vermicompost) reduced the negative effects of salinity on them and increased their amount despite the high concentration of salt. In the case of carotenoid pigments, severe salinity (12 dsm-1) decreased their amount, but the use of vermicompost at this level of stress increased it. Also, the results of this research showed that the amount of anthocyanin pigments in medium and severe salinity (8 and 12 dsm-1), increasing the level of vermicompost decreased the amount of this compound in the aerial parts of the plant. The amount of proline and soluble sugars of shoots and roots also went up under the influence of different salinity levels. In the case of soluble sugars, the use of vermicompost at low levels of salinity caused an increase, and at higher levels of salinity, the use of 30% vermicompost treatment decreased these compounds. In the case of proline, the use of fertilizer in high amounts led to the reduction of this compound at higher levels of salt.
Conclusion: In general, the results of this research showed that the use of vermicompost, especially at higher levels, could reduce the negative effects of high salt concentrations on Euphorbia tirucalli L.and improve the plant's morphophysiological responses to salinity stress.

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Main Subjects


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