Effects of Irrigation Regimes on Antioxidant Activity and Total Phenolic Content of Thyme (Thymus vulgaris L.)

Khosh-Khui, Morteza; F, Ashiri; Mj, Saharkhiz

doi:10.4172/2167-0412.1000114

Cited by 5 publications

(1 citation statement)

References 19 publications

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“…Thyme plants subjected to different irrigation intervals showed that severe water stress significantly reduced antioxidant activity as measured by DPPH and FRAP assays. Long-term drought led to decreased total phenolic content, indicating overall lower antioxidant activity under water stress conditions ( Khosh-khui, Ashiri & Saharkhiz, 2012 ). Research on various plant species under drought conditions has shown that different species and different conditions of drought can lead to varying responses in antioxidant activities.…”

Section: Discussionmentioning

confidence: 99%

Comprehensive evaluation of drought stress on medicinal plants: a meta-analysis

Tan,

Gören

2024

PeerJ

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Drought stress significantly affects plants by altering their physiological and biochemical processes, which can severely limit their growth and development. Similarly, drought has severe negative effects on medicinal plants, which are essential for healthcare. The effects are particularly significant in areas that rely mostly on traditional medicine, which might potentially jeopardize both global health and local economies. Understanding effects of droughts on medicinal plants is essential for developing strategies to enhance plant adaptability to drought stress, which is vital for sustaining agricultural productivity under changing climatic conditions. In this study, a meta-analysis was conducted on 27 studies examining various parameters such as plant yield, chlorophyll content, relative water content, essential oil content, essential oil yield, non-enzymatic antioxidants, enzymatic antioxidants, phenols, flavonoids, and proline content. The analysis explored the effects of drought across different stress conditions (control, moderate, and severe) to gain deeper insights into the drought’s impact. The categorization of these stress conditions was based on field or soil capacity: control (100–80%), moderate (80–50%), and severe (below 50%). This classification was guided by the authors’ descriptions in their studies. According to meta-analysis results, enzymatic antioxidants emerge as the most responsive parameters to stress. Other parameters such as relative water content (RWC) and yield also exhibit considerable negative mean effect sizes under all three stress conditions. Therefore, when evaluating the impacts of drought stress on medicinal plants, it is beneficial to include these three parameters (enzymatic antioxidants, RWC, and yield) in an evaluation of drought stress. The chlorophyll content has been determined not to be a reliable indicator for measuring impact of drought stress. Also, measuring antioxidants such as flavonoids and phenols could be a better option than using radical scavenging methods like DPPH (2, 2-difenil-1-pikrilhidrazil), FRAP (ferric reducing antioxidant power), and ABTS (2, 2′-Azino-bis (3-ethylbenzothiazoline-6-sulfonic acid)).

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Section: Discussionmentioning

confidence: 99%

Comprehensive evaluation of drought stress on medicinal plants: a meta-analysis

Tan,

Gören

2024

PeerJ

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Morpho-Physiological and Antioxidant Traits of Marigold cv. ‘Sparse Petal’ and ‘Compact Petal’ as Influenced by Irrigation Intervals

Bigdeli

Biglouei

Moghaddam

et al. 2022

J Plant Growth Regul

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Effect of water deficit on growth and concentration of secondary metabolites of Thymus vulgaris

Szabó

Zámboriné

Falade

et al. 2022

Zemdirbyste-Agriculture

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The aim of the experiment was to investigate the effect of the level and timing of watering on the productivity and chemical constituents of garden thyme (Thymus vulgaris L., cultivar 'Varico 3') at growth stage (GS) 202 based on the extended BBCH scale in growth chamber for 13 weeks. Different irrigation regimes have been applied based on the soil water content (SWC%) as follows: 1) control (C: 1-13th weeks -70% SWC), 2) mild drought stress (S1: 1-4th weeks -70% SWC, from the 6th week, continuously decreasing drought stress to 40% DVD for 10-13th weeks), 3) sudden drought stress (S2: 1-9th weeks -70% SWC, 10-13th weeks -40% DVD), and 4) constant drought stress (S3: 1-4th weeks -70% DVK, 5-13th weeks -40% SWC). At the end of the experiment, it was determined that water deficiency induced no direct impact on the width and height of garden thyme plants, while internode and shoot lengths were affected significantly. The plants grown under constant drought stress (S3) conditions showed the minimum values concerning lengths (internode 1.30 cm, shoot 7.12 cm), while the highest ones (internode 2.50 cm, shoot 22.08 cm) were found in the control treatment. However, water supply had no significant effect on the shoot number and chlorophyll content of the leaves. The impact of drought stress both on rosmarinic acid and total phenolic content (TPC) was significant and showed the highest values in the S2 and S3 treatments: S2 had the highest rosmarinic acid concentration of 4.61%, and S3 had the highest total phenolic concentration of 0.75 mg GAE ml -1 . A similar result was found for antioxidant capacity in the S3 treatment, where plants reached the highest values (275.44 mg AAE g -1 dry weight), while the total flavonoid content was not significantly affected by different water supply levels. The results show that not only the level of water deficiency but also the change in water supply and the timing of the drought may have a significant effect on the quantity and quality of garden thyme production.

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Effects of Irrigation Regimes on Antioxidant Activity and Total Phenolic Content of Thyme (Thymus vulgaris L.)

Cited by 5 publications

References 19 publications

Comprehensive evaluation of drought stress on medicinal plants: a meta-analysis

Comprehensive evaluation of drought stress on medicinal plants: a meta-analysis

Morpho-Physiological and Antioxidant Traits of Marigold cv. ‘Sparse Petal’ and ‘Compact Petal’ as Influenced by Irrigation Intervals

Effect of water deficit on growth and concentration of secondary metabolites of Thymus vulgaris

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