Effect of Potassium Levels on Antioxidant Enzymes and Malondialdehyde Content under Drought Stress in Sunflower (Helianthus annuus L.)

By H. Soleimanzadeh, D. Habibi, M. Ardakani, F. Paknejad, F. Rejali. 2010

99 citations recorded by the source corpus.

Problem Statement: Drought stress as a major adverse factor can lower leaf water potential, leading to reduced turgor and some other responses and ultimately lower crop productivity in arid and semi arid zones. Sunflower is one of the main oil seed crops in Iran, where drought stress is the most limiting factor. Drought stress tolerance requires the activation of complex metabolic activities including ant oxidative pathways, especially Activated Oxygen Species (AOS) and scavenging systems within the cells which can contribute to continued growth under drought stress. Approach: To evaluate the effect of limited irrigation systems and potassium fertilizer on seed yield, some antioxidant enzymes and lipid per oxidation biomarker (MDA), the crop was sown in the Research Farm of College of Agriculture, Islamic Azad University, Karaj Branch in 2009. The experimental treatments were arranged as split plots based on a Randomized Complete Block Design with three replications. The main plots were allocated to three different irrigation regimes. The irrigation regimes comprised of: Full Irrigation (IR1), Moderate drought stress (IR5) and Severe drought stress (IR2). The subplots were allocated to four potassium chemical fertilizer (potassium nitrate) consisting of K1 = 25, K2 = 50, K3 = 75 and K4 = 100% recommended. Results: Plants under drought stress and potassium levels showed a significant increase and decrease, respectively, in SOD, CAT and GPX activity and MDA in compared to control plants. In this context, plants with higher levels of potassium showed higher resistance to drought stress conditions and higher yield and dry matter allocation to grain filling process i.e. harvest index. Results of this study suggested that drought stress leads to production of oxygen radicals, which results in increased lipid peroxidation (MDA biomarker) and oxidative stress in the plant. Conclusion: The scavenging of AOS by the scavenging system especially by SOD, CAT and GPX was done well and damage to membranes or MDA was controlled at higher levels of potassium.

Subfields: Plant Science

View Paper: https://www.semanticscholar.org/paper/c8792984c3439ee30f827009507a491d893aa6ba

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In Plant Science

1. Kamrun Nahar
2. M. Hasanuzzaman
3. M. Fujita
4. J. Mahmud
5. M. Bhuyan
6. M. Seleiman
7. Mahabub Alam
8. M. A. Hossain

Citations in the corpus

• Drought Stress Impacts on Plants and Different Approaches to Alleviate Its Adverse Effects (2021, background): “…a, b and carotenoids increased [197] Sunflower Withholding irrigation at grain filling 100 kg ha −1 shoot dry matter and biomass increased [198] Rice 30 DAP for 10 days 120 kg ha −1 shoot dry matter increased and osmolyte synthesis enhanced [199] Maize 65% of FC water holding 0.42 g kg −1…”
• Potassium: A Vital Regulator of Plant Responses and Tolerance to Abiotic Stresses (2018, methodology): “[117] performed an experiment with sunflower (Helianthus annuus L.”