Effects of 28-homobrassinolide on growth, lipid peroxidation and antioxidative enzyme activities in seedlings of Zea mays L. under salinity stress |
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Authors: | Nitika Arora Renu Bhardwaj Priyanka Sharma Hardesh Kumar Arora |
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Institution: | (1) Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, 143005, Punjab, India |
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Abstract: | The effects of 28-homobrassinolide (28-homoBL) on seedling growth, lipid peroxidation and antioxidative enzyme activities
in the seedlings of Zea mays L. (var. Partap-1) under salt (NaCl) stress were studied. The surface-sterilized seeds were germinated in petriplates containing
different concentrations of NaCl (25, 50, 75 and 100 mM) only, 28-homoBL (10−7, 10−9 and 10−11 M) only and NaCl supplemented with 28-homoBL for 7 days. The activities of superoxide dismutase (SOD, EC 1.15.1.1), guaiacol
peroxidase (POD, EC 1.11.1.7), catalase (CAT, EC 1.11.1.6), ascorbate peroxidase (APOX, EC 1.11.1.11) and glutathione reductase
(EC 1.6.4.2) were analysed in 7 day-old seedlings. It was observed that 28-homoBL treatments reduced the toxicity of salt
on seedling growth considerably. Lipid peroxidation level was significantly increased under saline stress, but lowered with
28-homoBL applications revealing less oxidative damage. Further 28-homoBL treatments to the seedlings showed an enhancement
in activities of SOD, POD, CAT and APOX. The activities of all antioxidative enzymes were further increased in seedlings treated
with solution containing 28-homoBL and salt together as compared to seedlings treated with different concentration of salt
solution only. |
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Keywords: | Antioxidative enzymes 28-Homobrassinolide Lipid peroxidation Maize NaCl |
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