Effects of Salicylic Acid and Microorganisms on Morphological and Physiological Characteristics (Satureja hortensis L.) under Drought Stress

Year 2023, Volume: 82 Issue: 1, 12 - 22, 26.06.2023

Mahmoud Ghojavand Porang Kasraei Hamid Reza Tohidi Moghadam Mohammad Nasri Hamid Reza Larijani

https://doi.org/10.26650/EurJBiol.2023.1196479

Abstract

Objective: As a critical limitation of plant growing, drought stress has always received a lot of attention from botanical researchers. This study intends to investigate the role of salicylic acid and the Mycorrhiza and Azotobacter bio-fertilizer on Satureja hortensis L. under drought stress.

Materials and Methods: Salicylic acid and bio-fertilizers have been shown to improve drought tolerance in growing plants. To evaluate the synergistic effect of salicylic acid, Azotobacter chroococcum bacteria, and arbuscular mycorrhizal fungi under drought stress (-3.5 atm: W1), (- 6.5 atm: W2), and (-10 atm: W3), a 2-year (2016 to 2018) field experiment was organized based on split-plot factorial statistical in a randomized complete block design, with three replicates.

Results: The main findings of this study showed that the combinable use of bio-fertilizers and salicylic acid diminished the disadvantageous effects of drought stress. Co-application of bio- fertilizers and salicylic acid significantly increased chlorophyll a and b (22% and 31.5%), carotenoid (30.7%) contents, aerial fresh (38.3%) and dry (64.1%) weights, root fresh (55.8%), and dry (45%) weights, auxin (15%), percentage of essential oil (30.7%) in S. hortensis while it decreased the proline content (48.8%) under severe stress as compared to the control groups, which confirmed the efficacy of this approach and its role in drought tolerance.

Conclusion: The results demonstrated that this new suggested treatment could effectively alleviate drought stress symptoms and improve S. hortensis growth under spreading drought conditions and limited water resources.

Keywords

Satureja Hortensis L., Arbuscular Mycorrhizal Fungi, Bio-Fertilizers, Drought Stress, Phytohormone

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