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- Title
Exogenous Melatonin Regulates the Expression Pattern of Antioxidant-Responsive Genes, Antioxidant Enzyme Activities, and Physio-chemical Traits in Pearl Millet Under Drought Stress.
- Authors
Awan, Samrah Afzal; Khan, Imran; Rizwan, Muhammad; Brestic, Marian; Wang, Xiaosan; Zhang, Xinquan; Huang, Linkai
- Abstract
Drought stress negatively influences agricultural land and production worldwide. Therefore, it is crucial to reduce the deleterious impacts of drought on cereal crops. However, the potential of melatonin in the mitigation of drought stress is not clearly understood especially in crop plants. The present study investigates the impact of different methods (seed priming and foliar) and concentrations (0, 40, 80, 120, and 160 µM) of melatonin on pearl millet (Pennisetum glaucum L. R. Br.) under drought stress. Impact of melatonin was determined by examining the growth, photosynthesis, osmolyte production, oxidative damage, antioxidant enzyme activities, and expression pattern of antioxidant-responsive genes under drought. The exogenous melatonin at different concentrations differentially improved the growth, physiological, and biochemical traits of pearl millet under drought stress. In both treated methods, melatonin positively regulated the expression pattern of antioxidant-responsive genes that are involved in drought tolerance. Moreover, melatonin improved the proline content and reduced oxidative damage by decreasing hydrogen peroxide (H2O2) and malondialdehyde (MDA) content. Moreover, a significant improvement in the activities of antioxidants such as catalase (CAT), superoxide dismutase (SOD), peroxidase (POD), glutathione peroxidase (GPX), and glutathione reductase (GR) was noted in pearl millet under drought on exposure to melatonin. The seed priming at 120 µM and foliar at 160 µM was found very effective for pearl millet growth under drought. Overall, the present study suggested that seed treatment and foliar treatment of melatonin differentially mitigated the drought stress in pearl millet.
- Subjects
PEARL millet; GENE expression; DROUGHTS; MELATONIN; GLUTATHIONE reductase; GLUTATHIONE peroxidase
- Publication
Journal of Plant Growth Regulation, 2024, Vol 43, Issue 4, p1061
- ISSN
0721-7595
- Publication type
Article
- DOI
10.1007/s00344-023-11159-w