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Water stress-induced oxidative damage and antioxidant responses in micropropagated banana plantlets
Authors:T. -T. Chai  N. M. Fadzillah  M. Kusnan  M. Mahmood
Affiliation:(1) Department of Biology, Faculty of Science and Environmental Studies, Universiti Putra Malaysia, 43400 UPM Serdang, Malaysia;(2) Department of Biochemistry and Microbiology, Faculty of Science and Environmental Studies, Universiti Putra Malaysia, 43400 UPM Serdang, Malaysia;(3) Present address: School of Science & Mathematics, INTI College Malaysia, Jalan BBN12/1, Bandar Baru Nilai, 71800 Negeri Sembilan, Malaysia
Abstract:Oxidative injury and antioxidant responses were investigated in two banana genotypes (Musa AAA lsquoBeranganrsquo and Musa AA lsquoMasrsquo) subjected to 40 % PEG-induced water stress. PEG treatment resulted in oxidative injury, as expressed in increased lipid peroxidation and reduced membrane stability index, in both cultivars; however, greater oxidative injury was detected in lsquoMasrsquo. Under PEG treatment, catalase activity and glutathione reductase activity were enhanced in both cultivars, but were higher in lsquoMasrsquo. Ascorbate peroxidase activity was enhanced in lsquoBeranganrsquo under water stress, but was unaffected in lsquoMasrsquo. Meanwhile, superoxide dismutase activity was inhibited in both cultivars under water stress, but higher activity was detected in lsquoBeranganrsquo. Higher ascorbate peroxidase and superoxide dismutase activities were associated with greater protection against water stress-induced oxidative injury.
Keywords:oxidative stress  ascorbate peroxidase  superoxide dismutase  glutathione reductase  catalase  lipid peroxidation
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