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<p>In order to assess the role of triacontanol (TRIA) in arsenic (NaAsO<sub>2</sub>) stress tolerance in wheat (<i>Triticum aestivum</i> L.) varieties, a pot experiment was conducted at the Botanic Garden, Government College University, Faisalabad (Pakistan). Grains of three wheat varieties, i.e., Anaj-2017, Ujala-2016 and AARI-2011 were sown in sand-filled plastic pots. Arsenic (0, 50, and 100&#xa0;mg/L NaAsO<sub>2</sub> in full-strength Hoagland’s nutrient solution) stress was applied after 7 weeks of germination. Foliar application of TRIA (1 µM) was performed on 8-week-old wheat plants.Data from 16-week-old wheat plants was collected for the determination of various growth, physiological and biochemical parameters. Arsenic drastically reduced root and shoot length (18% and 11% respectively), root fresh and dry weights (34% and 32% respectively), total soluble sugars (41%), total free amino acids (36%) and total soluble proteins (12%). Under arsenic stress, hydrogen peroxide (H<sub>2</sub>O<sub>2</sub> 94%), malondialdehyde (MDA 31%), activities of superoxide dismutase (SOD 91%), peroxidase (POD 43%), catalase (CAT 87%), ascorbate peroxidase (APX 75%), guaiacol peroxidase (GPX 40%) and nitrate reductase (NR) significantly increased. Foliar application of TRIA increased total phenolics (23%), total soluble proteins (39%), total free amino acids (51%); activities of POD, GPX and NR (27%, 78% and 24% respectively), and grain nutrition contents, e.g., protein (23%), starch (22%), gluten (10%) and moisture contents (37%) that led to increased growth and arsenic stress tolerance in all three wheat varieties, i.e., Anaj-2017, Ujala-2016 and AARI-2011. From the obtained results it was concluded that foliar application of TRIA (1 µM) can be effective in the induction of arsenic stress tolerance in wheat plants.</p>

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Triacontanol Improves Arsenic Stress Tolerance in Triticum aestivum L. Varieties by Modulating Secondary Metabolites, Antioxidant Defense System and Grains’ Nutritional Contents

  • 期刊论文

  • 发表日期：

    2025年1月3日

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  • Hafiz Muhammad Mubashar Ali,
  • Shagufta Perveen

摘要

In order to assess the role of triacontanol (TRIA) in arsenic (NaAsO2) stress tolerance in wheat (Triticum aestivum L.) varieties, a pot experiment was conducted at the Botanic Garden, Government College University, Faisalabad (Pakistan). Grains of three wheat varieties, i.e., Anaj-2017, Ujala-2016 and AARI-2011 were sown in sand-filled plastic pots. Arsenic (0, 50, and 100 mg/L NaAsO2 in full-strength Hoagland’s nutrient solution) stress was applied after 7 weeks of germination. Foliar application of TRIA (1 µM) was performed on 8-week-old wheat plants.Data from 16-week-old wheat plants was collected for the determination of various growth, physiological and biochemical parameters. Arsenic drastically reduced root and shoot length (18% and 11% respectively), root fresh and dry weights (34% and 32% respectively), total soluble sugars (41%), total free amino acids (36%) and total soluble proteins (12%). Under arsenic stress, hydrogen peroxide (H2O2 94%), malondialdehyde (MDA 31%), activities of superoxide dismutase (SOD 91%), peroxidase (POD 43%), catalase (CAT 87%), ascorbate peroxidase (APX 75%), guaiacol peroxidase (GPX 40%) and nitrate reductase (NR) significantly increased. Foliar application of TRIA increased total phenolics (23%), total soluble proteins (39%), total free amino acids (51%); activities of POD, GPX and NR (27%, 78% and 24% respectively), and grain nutrition contents, e.g., protein (23%), starch (22%), gluten (10%) and moisture contents (37%) that led to increased growth and arsenic stress tolerance in all three wheat varieties, i.e., Anaj-2017, Ujala-2016 and AARI-2011. From the obtained results it was concluded that foliar application of TRIA (1 µM) can be effective in the induction of arsenic stress tolerance in wheat plants.