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Salinity‑induced changes in seed germination and the expression profile of antioxidant enzymes in peanut as early and late responses in emerging radicles

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Title Salinity‑induced changes in seed germination and the expression profile of antioxidant enzymes in peanut as early and late responses in emerging radicles
Not Available
 
Creator Koushik Chakraborty
Sujit K. Bishi
Nisha Goswami
Amrit L. Singh
Debarati Bhaduri
Pratap V. Zala
 
Subject Germination
Groundnut
Oxidative stress
Reactive oxygen species
Seedling emergence
Salt stress
 
Description Not Available
Reactive oxygen species (ROS) play a critical role in developmental and signal transduction processes during seed germination and early seedling establishment stages. Higher concentrations of ROS are known to have detrimental effects when the plant is under salt stress. In the present study, we aimed to test the early (1 h) and late (48 h) response of enzyme-driven ROS detoxification system in six peanut genotypes under salt stress at early seedling stage. Salt stress was imposed with three treatment concentrations of NaCl (50, 100 and 200 mM NaCl), all of which showed a reduction in seed germination and seedling vigour index. The 200 mM NaCl stress showed severe reduction of growth, while 100 mM NaCl stress resulted in rapid increase in O2
·− and H2O2 contents. The O2
·− content increased twofold in sensitive genotypes after 1 h of stress, whereas
the tolerant genotypes showed ~ 60% rise. A prompt rise (> 50-fold) in SOD transcript was occurred within 1 h of salt stress
in the tolerant genotypes (early response). But induction in SOD activity was observed only after 48 h of salt stress (late
response). After 48 h of salt stress, the tolerant genotypes showed greater induction of POD activity, whereas in the sensitive
genotypes CAT activity was more pronounced. We found POD and CAT played a greater role in H2O2
detoxification
in tolerant and sensitive genotypes, respectively, during longer duration of the stress. This study summarizes the selective
induction of different components of antioxidant enzyme system and their role in cellular fine tuning of ROS level in peanut
under salt stress during seedling establishment stage.
Not Available
 
Date 2020-06-18T11:14:33Z
2020-06-18T11:14:33Z
2019-07-13
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/37195
 
Language English
 
Relation Not Available;
 
Publisher Springer