Volume 13, Issue 60 (vol. 13, no. 60 2024)
2024, 13(60): 289-302 |
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Department of Agriculture, Payame Noor University, Tehran, Iran , hadis_zaremanesh@yahoo.com
Abstract: (302 Views)
A factorial experiment using a randomized complete block design with three replications was carried out at Payame Noor University of Lorestan Province to study the effects of potassium sulfate sprays on the traits of Thymus daenensis under salinity stress. The factors were salinity stress (0, 50 and 100 mM sodium chloride) and potassium sulfate sprays (0, 1 and 2 g/L). In the 100 mM sodium chloride treatment, total chlorophyll and chlorophyll a and b contents and leaf relative water content were at their lowest levels (6.7, 4.3 and 11 mg/g fresh weight and 57.8%, respectively). Application of potassium sulfate sprays, especially at 2 g/L, significantly improved these traits. In the 100 mM sodium chloride treatment, carotenoid and proline contents increased by 94% and 195%, respectively, compared to the treatment with no salinity stress, whereas carotenoid and proline contents increased by 17% and 16%, respectively, compared to the control when potassium sulfate was applied at 2 g/L. The highest hydrogen peroxide content was recorded in the treatment in which the plants were under salinity stress (100 mM sodium chloride) and potassium sulfate was not applied. However, application of potassium sulfate (1g and 2 g/L) decreased hydrogen peroxide contents by 22% and 44%, respectively. The highest rates of superoxide dismutase and ascorbate peroxidase activity (9.60 and 0.910 units/mL enzyme extract) were observed under the treatment of salinity stress (100 mM sodium chloride) and the application of potassium spray (2 g/L). In general, salinity levels, especially the 100 mM sodium chloride treatment, led to a decrease in chlorophyll content and relative leaf water content and an increase in carotenoid and proline content traits, hydrogen peroxide, malondialdehyde content, and the activity of superoxide desmutase and ascorbate peroxidase enzymes. On the other hand, the application of potassium sulfate foliar application could greatly reduce the negative effects of stress.
Article number: 17
Type of Study: Research |
Subject:
Salt Stress
Received: 2023/07/31 | Accepted: 2023/11/7 | Published: 2024/06/18
Received: 2023/07/31 | Accepted: 2023/11/7 | Published: 2024/06/18
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