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The effects of various environmental stresses on the activities of seven antioxidant enzymes were investigated in Arabidopsis thaliana. Three-week-old plants were exposed to a high temperature (30 C), an enhanced light intensity (200 E/m2/sec), water deficiency (water deprivation for 2 days), a chilling temperature (5 C), or ultraviolet-B (UV-B) radiation (0.25 or 0.094 W/m2) for 1 week (except for...
A genomic DNA clone encoding cytosolic ascorbate peroxidase was isolated from a genomic library of Arabidopsis thaliana, using a cDNA for the enzyme as a probe. Nucleotide sequence and primer extension analyses of this gene (APX1) revealed nine exons split by eight introns, one of which is inserted in the 5'-untranslated region. The exon/intron organization of the APX1 gene differs from that of the...
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