Document Type : Research Paper
Authors
1
Department of Eco-Physiology, Faculty of Agriculture, Tabriz University, Tabriz, Iran.
2
Professor, Department of Plant Ecophysiology, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.
3
Department of Plant Breeding and Biotechnology, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.
10.22034/saps.2025.65798.3340
Abstract
Objectives: Various species of mycorrhizal fungi are used to improve the chilling stress resistance of purple coneflower and also to increase essential oil production.
Materials & Methods: The experiment was conducted as a factorial experiment based on a randomized complete block design with three replications in the research greenhouse of the Molecular Grain Breeding Center of the Faculty of Agriculture, Tabriz University in 2022. Chilling stress was performed at temperature levels (control (25), 8 and 4 °C) at the rosette stage, and the mycorrhizal fungi Diversispora versiformis and Rhizophagus intraradices were placed at a depth of about 5 cm of soil before planting.
Results: Chilling stress reduced plant height, leaf number per plant, chlorophyll index, leaf relative water content, leaf temperature, membrane stability index, and plant weight. The use of mycorrhizal fungi increased plant height and chlorophyll index. There was no statistically significant difference in this increase between Diversispora versiformis and Rhizophagus intraradices. The essential oil content of purple coneflower was affected by the interaction between chilling stress and the use of mycorrhizal fungi. At the optimal growth temperature, the highest essential oil content was recorded by Rhizophagus intraradices, but at +8 and +4 temperatures, there was no significant difference between Diversispora versiformis and Rhizophagus intraradices.
Conclusion: Chilling stress caused a decrease in morphological and physiological traits. At optimal temperatures, the use of Glomus intraradices and under chilling stress, the use of fungi Diversispora versiformis and Rhizophagus intraradices can improve morpho-physiological traits and essential oil of purple coneflower.
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