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THE PLANT CELL, Vol 1, Issue 6 599-607, Copyright © 1989 by American Society of Plant Biologists

RESEARCH ARTICLES

Functional Analysis of DNA Sequences Responsible for Ethylene Regulation of a Bean Chitinase Gene in Transgenic Tobacco

K. E. Broglie, P. Biddle, R. Cressman and R. Broglie
E.I. DuPont de Nemours & Co., Inc., Agricultural Products Department, Experimental Station, Wilmington, Delaware 19880

Expression of at least two genes from bean encoding the defense-related protein chitinase has been shown previously to be transcriptionally regulated by the phytohormone ethylene. We have determined the complete nucleotide sequence of one of these genes, the CH5B gene, which resides on a 4.7-kilobase fragment of bean genomic DNA. The structural gene consists of a single open reading frame and encodes the 301 amino acids of the mature protein and a 26-amino acid signal peptide. The CH5B gene has been introduced into tobacco plants using Agrobacterium Ti-plasmid vectors. Little or no expression of the bean gene was observed when transgenic tobacco plants were grown in air; however, exposure of these plants to an atmosphere containing 50 parts per million ethylene resulted in an approximately 20-fold to 50-fold increase in the level of the bean chitinase mRNA. Ethylene-dependent expression of a chimeric gene consisting of 1.6 kilobases of 5[prime]-flanking DNA derived from the CH5B gene fused to the coding sequence of [beta]-glucuronidase indicates that this region of the CH5B gene is sufficient for ethylene-regulated expression. Deletion analysis of the CH5B promoter region has allowed us to localize these DNA sequences to within a 228-base pair region situated between -422 and -195 upstream of the transcriptional start site. This region is characterized by two short DNA sequences that are exactly conserved in a second ethylene-regulated bean chitinase gene.


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