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Drought-Induced Oxidative Stress in Pearl Millet (Cenchrus americanus L.) at Seedling Stage: Survival Mechanisms through Alteration of Morphophysiological and Antioxidants Activity

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Title Drought-Induced Oxidative Stress in Pearl Millet (Cenchrus americanus L.) at Seedling Stage: Survival Mechanisms through Alteration of Morphophysiological and Antioxidants Activity
Not Available
 
Creator Shuvasish Choudhury, Debojyoti Moulick, Dibakar Ghosh, Mohamed Soliman, Adel Alkhedaide, Ahmed Gaber and Akbar Hossain
 
Subject antioxidants; drought; oxidative stress; pearl millet; redox implications; ROS
 
Description Research article
We report the impact of drought stress on pearl millet during the early seedling stage
and its survival mechanism. Drought stress imposed for a period of 7, 14 and 21 days showed
considerable changes in morphophysiological attributes, which were evident by a decline in seedling
elongation, fresh and dry biomass, and relative water content (RWC) and degradation of chlorophyll
pigment. Besides this, visible chlorosis lesions were observed in leaves as compared to the control. As
compared to the respective controls, a nearly 60% decline in chlorophyll content was recorded after
14 and 21 days of drought stress. In both root and shoot, drought stress raised the reactive oxygen
species (ROS) levels. Both H2O2 and O2
􀀀 levels were significantly elevated along with a significant
increase in lipid peroxidation in both roots and shoots, which clearly indicated ROS-induced oxidative
stress. Concomitant with the increase in ROS levels and malondialdehyde (MDA) content in roots,
membrane integrity was also lost, which clearly indicated ROS-induced peroxidation of membrane
lipids. The activities of antioxidant enzymes and levels of non-enzymatic antioxidants were significant
(p 0.001). After 7, 14 and 21 days of drought stress, activities of all the antioxidant enzymes viz.,
catalase (CAT), guaiacol peroxidase (GPX), superoxide dismutase (SOD) and glutathione reductase
(GR) were inhibited, clearly indicating a loss of antioxidant defense machinery. Likewise, the levels of
ascorbate (AsA) and reduced glutathione (GSH) levels declined significantly (p 0.01). Our results
reveal that, being tolerant to arid climatic conditions, pearl millet is highly susceptible to drought
stress at the early seedling stage.
Not Available
 
Date 2024-02-09T17:36:25Z
2024-02-09T17:36:25Z
2022-07-13
 
Type Article
 
Identifier Choudhury, S.; Moulick, D.; Ghosh, D.; Soliman, M.; Alkhedaide, A.; Gaber, A.; Hossain, A. Drought-Induced Oxidative Stress in Pearl Millet (Cenchrus americanus L.) at Seedling Stage: Survival Mechanisms through Alteration of Morphophysiological and Antioxidants Activity. Life 2022, 12, 1171. https://doi.org/10.3390/ life12081171
2075-1729
http://krishi.icar.gov.in/jspui/handle/123456789/81345
 
Language English
 
Relation Not Available;
 
Publisher MDPI