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<p>Canola (<i>Brassica napus</i> L.) is a major oilseed crop in temperate regions. Salinity stress is a main abiotic stressor that prevents the growth of plants. The aim of study was to determine the role of plant growth regulators, melatonin (MT) and ascorbic acid (AsA), which induce various cellular, metabolic, and biochemical reactions in response to salinity stress. Two canola varieties namely Oscar and Super, were used. Salt stress (Control, 75 mM NaCl, and 150 mM NaCl), and c) MT and AsA (water spray, 100 µM MT, 1 mM AsA, and 100 µM MT + 1 mM AsA). Under salt stress, shoot fresh weight and shoot length (25.5 and 23.5%), and (24.2 and 27.7%), total chlorophyll (33.3 and 35.1%), and carotenoids (29.1 and 40.3%) were reduced while the combined effect of MT and AsA improved these parameters (21.02 and 16.4%), and (49.3 and 45%), (41.8 and 31.9%), and (30.6 and 24.8%) in Oscar and Super consequently. Application of MT and AsA improved the activities of catalase (CAT) (21.4 and 18.9%), peroxidase (POD) (24.2 and 12.3%), and superoxide dismutase (SOD) (20.5 and 17.2%) in both varieties. Non-enzymatic antioxidants including anthocyanin, leaf ascorbic acid (AsA), and flavonoids were also increased (33 and 28.5%), (63.1 and 54.8%), and (34.2 and 26.1%) by foliar application with combined MT and AsA. Overall results indicated that exogenous MT and AsA treatment enhanced the morphological traits, photosynthetic pigments, organic osmolytes, and antioxidant levels of canola while reducing salinity-induced oxidative damage. Furthermore, the overall results showed that Oscar performed better than Super.</p>

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Foliar Application of Melatonin and Ascorbic Acid Mitigates Salinity Stress by Improving the Morpho-Physiological, and Antioxidant Defense System in Canola (Brassica Napus L.)

  • 期刊论文

  • 发表日期：

    2026年2月6日

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  • Tahrim Ramzan,
  • Muhammad Shahbaz,
  • Farooq Ahmad,
  • Ejaz Ahmad Waraich

摘要

Canola (Brassica napus L.) is a major oilseed crop in temperate regions. Salinity stress is a main abiotic stressor that prevents the growth of plants. The aim of study was to determine the role of plant growth regulators, melatonin (MT) and ascorbic acid (AsA), which induce various cellular, metabolic, and biochemical reactions in response to salinity stress. Two canola varieties namely Oscar and Super, were used. Salt stress (Control, 75 mM NaCl, and 150 mM NaCl), and c) MT and AsA (water spray, 100 µM MT, 1 mM AsA, and 100 µM MT + 1 mM AsA). Under salt stress, shoot fresh weight and shoot length (25.5 and 23.5%), and (24.2 and 27.7%), total chlorophyll (33.3 and 35.1%), and carotenoids (29.1 and 40.3%) were reduced while the combined effect of MT and AsA improved these parameters (21.02 and 16.4%), and (49.3 and 45%), (41.8 and 31.9%), and (30.6 and 24.8%) in Oscar and Super consequently. Application of MT and AsA improved the activities of catalase (CAT) (21.4 and 18.9%), peroxidase (POD) (24.2 and 12.3%), and superoxide dismutase (SOD) (20.5 and 17.2%) in both varieties. Non-enzymatic antioxidants including anthocyanin, leaf ascorbic acid (AsA), and flavonoids were also increased (33 and 28.5%), (63.1 and 54.8%), and (34.2 and 26.1%) by foliar application with combined MT and AsA. Overall results indicated that exogenous MT and AsA treatment enhanced the morphological traits, photosynthetic pigments, organic osmolytes, and antioxidant levels of canola while reducing salinity-induced oxidative damage. Furthermore, the overall results showed that Oscar performed better than Super.