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. 1990 Dec;94(4):1647–1654. doi: 10.1104/pp.94.4.1647

Comparison of Increased Expression of Wild-Type and Herbicide-Resistant Acetolactate Synthase Genes in Transgenic Plants, and Indication of Posttranscriptional Limitation on Enzyme Activity

Joan T Odell 1, Perry G Caimi 1, Narendra S Yadav 1, C Jeffry Mauvais 1
PMCID: PMC1077433  PMID: 16667898

Abstract

Genes encoding wild type acetolactate synthase (ALS) and a sulfonylurea herbicide-resistant form of the enzyme, isolated from Arabidopsis thaliana, were expressed in transgenic Nicotiana tabacum plants under the control of their native promoters or of the highly active cauliflower mosaic virus 35S promoter. Expression of the wild type coding region from the 35S promoter resulted in a small, threefold increase in sulfonylurea tolerance above the levels measured in tissue expressing the native wild type gene. A much larger, 300-fold increase in herbicide tolerance was conferred by the mutant gene encoding a herbicide-resistant ALS. An additional 10-fold increase in tolerance was attained by expressing this coding region from the 35S promoter. The increase in both wild type and mutant gene expression directed by the 35S promoter resulted in over 25-fold higher levels of ALS messenger RNA in some transformants as compared with those expressing the native genes. However, ALS specific activity increased at most twofold, indicating that the amount of functional enzyme and messenger RNA are not correlated.

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Selected References

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