THE PLANT CELL, Vol 2, Issue 2 163-171, Copyright © 1990 by American Society of Plant Biologists

RESEARCH ARTICLES

Isolation of an Efficient Actin Promoter for Use in Rice Transformation

D. McElroy, W. Zhang, J. Cao and R. Wu
Field of Botany, Cornell University, Ithaca, New York 14853

We have characterized the 5[prime] region of the rice actin 1 gene (Act1) and show that it is an efficient promoter for regulating the constitutive expression of a foreign gene in transgenic rice. By constructing plasmids with 5[prime] regions from the rice Act1 gene fused to the coding sequence of a gene encoding bacterial [beta]-glucuronidase, we demonstrate 2that a region 1.3 kilobases upstream of the Act1 translation initiation codon contains all of the 5[prime]-regulatory elements necessary for high-level [beta]-glucuronidase (GUS) expression in transient assays of transformed rice protoplasts. The rice Act1 primary transcript has a noncoding exon separated by a 5[prime] intron from the first coding exon. Fusions that lack this Act1 intron showed no detectable GUS activity in transient assays of transformed rice protoplasts. Deletion analysis of the Act1 5[prime] intron suggests that the intron-mediated stimulation of GUS expression is associated, in part, with an in vivo requirement for efficient intron splicing.

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