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PLANT PHYSIOLOGY , Vol 102, Issue 3 991-1000, Copyright © 1993 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
Light-Regulated and Cell-Specific Expression of Tomato rbcS-gusA and Rice rbcS-gusA Fusion Genes in Transgenic Rice
J. Kyozuka, D. McElroy, T. Hayakawa, Y. Xie, R. Wu and K. Shimamoto
Plantech Research Institute, 1000 Kamoshida, Midori-ku, Yokohama 227, Japan (J.K., T.H., K.S.)
A previously isolated rice (Oryza sativa) rbcS gene was further
characterized. This analysis revealed specific sequences in the 5[prime]
regulatory region of the rice rbcS gene that are conserved in rbcS genes of
other monocotyledonous species. In transgenic rice plants, we examined the
expression of the [beta]-glucuronidase (gusA) reporter gene directed by the
2.8-kb promoter region of the rice rbcS gene. To examine differences in the
regulation of monocotyledonous and dicotyledonous rbcS promoters, the
activity of a tomato rbcS promoter was also investigated in transgenic rice
plants. Our results indicated that both rice and tomato rbcS promoters
confer mesophyll-specific expression of the gusA reporter gene in
transgenic rice plants and that this expression is induced by light.
However, the expression level of the rice rbcS-gusA gene was higher than
that of the tomato rbcS-gusA gene, suggesting the presence of quantitative
differences in the activity of these particular monocotyledonous and
dicotyledonous rbcS promoters in transgenic rice. Histochemical analysis of
rbcS-gusA gene expression showed that the observed light induction was only
found in mesophyll cells. Furthermore, it was demonstrated that the light
regulation of rice rbcS-gusA gene expression was primarily at the level of
mRNA accumulation. We show that the rice rbcS gene promoter should be
useful for expression of agronomically important genes for genetic
engineering of monocotyledonous species.
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