Differential Expression of the Catalase and Superoxide Dismutase Genes in Maize Ear Shoot Tissues : GENE STRUCTURE AND EXPRESSION : PROTEINS, ENZYMES AND METABOLISM

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The temporal expression of two major antioxidant gene-enzyme systems, catalases and superoxide dismutases, has been characterized in the husk leaf, silk, pistillate flower, whole kernel, and cob of the maize ear shoot. The catalase activity, CAT-2 and CAT-3 protein levels, and the steady-state mRNA levels of each of the three Cat genes reveal differential expression of these transcripts in tissues of the ear shoot. Although Cat1 and Cat3 expression is observed in all the aforementioned tissues, Cat2 expression is detected only at the late stages of whole kernel maturation. Because silk exhibits the same pattern of Cat gene expression as the pericarp, and both tissues share an identical histological origin, catalase gene expression might be associated with cell lineage. The levels of total superoxide dismutase activity and corresponding individual Sod transcripts are fairly constant throughout the temporal profiles of the ear shoot tissues. How-ever, the degree of accumulation of the multiple Sod mRNAs in the husk leaf is higher than in the cob. The possibility that the relative position of a tissue within the ear shoot influences the degree of accumulation of the various Sod mRNAs is discussed.
日本植物生理学会の論文