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. 1996 Oct;112(2):525–535. doi: 10.1104/pp.112.2.525

Tissue-specific activity of two manganese superoxide dismutase promoters in transgenic tobacco.

W Van Camp 1, D Hérouart 1, H Willekens 1, H Takahashi 1, K Saito 1, M Van Montagu 1, D Inzé 1
PMCID: PMC157975  PMID: 8883376

Abstract

In eukaryotes, manganese superoxide dismutase is a nuclear-encoded protein that scavenges superoxide radicals in the mitochondrial matrix. We have isolated two manganese superoxide dismutase genes from Nicotiana plumbaginifolia L. and fused the 5' upstream regulatory region of these genes to the beta-glucuronidase reporter gene. The two gene fusions displayed a differential tissue specificity in transgenic tobacco (Nicotiana tabacum). Promoter activity of the SodA1 gene fusion was found in the pollen, middle layer, and stomium of anthers, but was usually undetectable in vegetative organs of mature plants. The SodA2 gene fusion was expressed in the leaves, stems, roots, and flowers. SodA2 promoter activity was most prominent in the vascular bundles, stomata, axillary buds, pericycle, stomium, and pollen. Histochemical analysis of succinate dehydrogenase activity suggested that the spatial expression of the two gene fusions is generally correlated with mitochondrial respiratory activity.

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Selected References

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