Changes in Antioxidant Capacities and Antioxidant Enzyme Activities during Drought Stress
Changes in Antioxidant Capacities and Antioxidant Enzyme Activities during Drought Stress in the Germination Period of Madura Local Corn Seeds (Zea mays L.)
Layman Abstract : Drought stress is a major challenge for plant growth and productivity, affecting plants at the physiological, biochemical, and structural levels. This study examined how different levels of drought stress, simulated using polyethylene glycol (PEG), impact the antioxidant defenses of local Madura maize during germination. Seeds were exposed to 5%, 10%, and 15% PEG for six days, and their antioxidant activity was measured. Results showed that higher drought stress led to increased antioxidant levels, with the strongest response at 15% PEG. Specifically, antioxidant activity increased by up to 20%, and key protective enzymes (catalase and ascorbate peroxidase) were 4-5 times more active compared to normal conditions. This suggests that drought stress can trigger protective mechanisms in seeds, helping them manage harmful reactive oxygen species. The study highlights the potential of germinating maize seeds as natural antioxidants and suggests that drought stress could be beneficial for improving antioxidant properties, making maize more adaptable to less fertile lands.
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Original Abstract : One of the major environmental factors of plant growth and productivity is drought stress. A plant that grows under drought stress can have an adverse physiological, biochemical, and morphological effect. It is involved in metabolic responses such as signaling, physiological regulation, and defense responses. The effect of various polyethylene glycol (PEG) concentrations on induced drought stress on the antioxidant capacities and antioxidant enzyme activities was investigated on Madura local maize during germination. Seed samples were treated under 5%, 10%, and 15% of PEG for 6 days. The changes in the antioxidant capacities such as 2,2’-azino-bis-3-ethylbenzthiazoline-6-sulphonic acid (ABTS) and hydroxyl radical scavenging, antioxidant enzyme activities including catalase (CAT) and ascorbate peroxidase (APX) and gene expression were observed during seeds germination. The result showed that the antioxidant activity capacities and enzymes exhibited significantly higher levels in drought-treated conditions. The most effective level of drought stress to elevate the capabilities and enzyme activity of antioxidants, as well as its gene expression, was observed at 15% PEG, whereas ABTS scavenging activity was increased by 20% over the control, hydroxyl scavenging activity up to 14%, CAT and APX activity increased 4 - 5 times over the control. Along with the presence of antioxidant mechanisms, including the capacities and activities of different types of ABTS+, hydroxyl, CAT, and APX, might play important roles during the germination phase and be able to manage reactive oxygen species to the normal level under stress conditions. It was concluded that the germination seeds could be used as natural antioxidant agents, and drought could improve antioxidant levels, so this information is beneficial for broader cultivation on suboptimal land.
View Book: https://doi.org/10.9734/bpi/crpas/v7/...
#Drought #antioxidant #germination #maize #polyethyleneglycol
Changes in Antioxidant Capacities and Antioxidant Enzyme Activities during Drought Stress in the Germination Period of Madura Local Corn Seeds (Zea mays L.)
#Antioxidant #corn #maize #crop #cornseed #Zeamays
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