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Title of Journal: Plant Cell Rep

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Abbravation: Plant Cell Reports

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Springer Berlin Heidelberg

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DOI

10.1007/bf01115909

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1432-203X

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Characterization of the superoxide dismutase genes

Authors: Elsayed Mohamed Ryuya Matsuda Ahmed A Elkhatib Katsuaki Takechi Hiroyoshi Takano Susumu Takio
Publish Date: 2015/08/13
Volume: 34, Issue: 12, Pages: 2099-2110
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Abstract

The expression characteristics of superoxide dismutase SOD EC 11511 isozyme genes from halophytic Suaeda marit ima plants native to Japan and Egypt were analyzed using young plants grown under aseptic conditions A phylogenetic tree based on internal transcribed spacer sequences suggested that Egyptian S maritima is related to European and India S maritima while Japanese S maritima belongs to a separate clade An ingel SOD activity staining assay revealed that leaves from both the Egyptian and Japanese varieties showed high levels of CuZnSOD and FeSOD activity but no MnSOD activity conversely stems from both varieties showed MnSOD activity as well as other SOD isozyme activities In Japanese S maritima leaves SOD activity was increased by incubation in growth medium containing 400 mM NaCl while Egyptian S maritima leaves showed elevated SOD activity in the absence of high salt Genes encoding MnSOD and FeSOD were isolated from both plant types RTPCR analysis revealed that all SOD isozymeencoding genes were expressed at the same levels in leaves from both plant types grown in normal or highsalt medium In contrast the expression of genes encoding choline monooxygenase and betaine aldehyde dehydrogenase which are involved in betacyanin biosynthesis was increased in highsalt medium In leaves of Japanese S maritima plants Fe deficiency without high salt exposure preferentially decreased FeSOD activity On the other hand Fe deficiency with high salt exposure decreased not only FeSOD activity but also CuZnSOD activity suggesting that Fe availability is involved in the upregulation of SOD isozymes mediating salt tolerance

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