Spermine and putrescine enhance oxidative stress tolerance in maize leaves |
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Authors: | Email author" target="_blank">Nuran?DurmuEmail author As?m?Kadio?lu |
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Institution: | (1) Department of Biology, Faculty of Arts and Sciences, Karadeniz Technical University, 61080 Trabzon, Turkey |
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Abstract: | The protective effects of spermine (SPM) and putrescine (PUT) against paraquat (PQ), a herbicide in agriculture and oxidative
stress inducer, were investigated in the leaves of maize. Maize leaves were pretreated to SPM and PUT at concentrations of
0.2 and 1 mM and treated with PQ afterwards. Pretreatment with 1 mM of SPM and PUT significantly prevented the losses in chlorophyll
and carotenoid levels induced by PQ. Ascorbic acid content in the leaves pretreated with both polyamines was found to be higher
than those of the leaves pretreated with water. Also, pretreatment with SPM and PUT was determined to have some effects on
the activities of superoxide dismutase (SOD) and peroxidase (POD). 1 mM of SPM increased SOD activity, but PUT has no significant
effect on SOD activity. On the other hand, POD activity was recorded to increase slightly in response to both concentrations
of SPM and 1 mM of PUT. The results showed that such polyamine pretreated plants may become more tolerant to oxidative stress
due to increases in the antioxidative enzymes and antioxidants. |
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Keywords: | Antioxidants ascorbic acid carotenoid chlorophyll paraquat peroxidase putrescine spermine superoxide dismutase |
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