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KMID : 0368420060490060477
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Journal of Plant Biology
2006 Volume.49 No. 6 p.477 ~ p.483
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Differential expression of two SOD (Superoxide dismytase) genes from small radish (Rhaphanus sativus L. var.sativus)
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Kwon Soon-Il
An Chung-Sun
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Abstract
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We have isolated two Superoxide dismutase cDNA clones (RsCu/ZnSod andRsFeSod) from small radish (Raphanus sativus L.) by cDNA library screening.RsCu/ZnSod is 563 bp long, with an open reading frame of 153 amino acids, and corresponds to a protein of predicted molecular mass 15.1 kDa and a pl of 5.44. The 823-bp RsFeSod has an ORF of 213 amino acids, corresponding to a protein of predicted molecular mass 25.4 kDa and a pl of 8.77. Their nucleotide and deduced amino acid sequences show the highest homology with those ofArabidopsis. Genomic Southern blot analysis, using each cDNA clone as probe, has revealed that the SOD genes are present as at least two copies in the small radish genome. Nondenaturing polyacrylamide gels for SOD activity has demonstrated the presence of several isozymes, depending on the organ type and developmental stage. TheseRsSod genes also have differential expression patterns in response to treatments with white light, xenobiotics, UV, osmoticums, plant hormones, and salicylic acid. Therefore, we suggest that they are involved in an antioxidative defense mechanism against stress induced by environmental change.
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KEYWORD
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light, osmoticum, Raphanus, small radish, SOD, xenobiotics
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