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Abstract
Patatin accounts for 30–40 percent of the protein in potato tubers. Unlike most plant storage proteins, patatin is extremely well balanced nutritionally with an amino acid composition similar to casein. By using the promoter from the patatin gene and a high efficiency transformation system that we have developed, we can introduce any foreign gene into potato plants and have it specifically expressed in tubers. To determine how to best increase the amount of protein in tubers, we are investigating the regulation evolution of major ‘tuber-specific’ genes such as patatin. We have found that all of the trans-acting regulatory factors necessary for high levels of patatin gene expression are present in both tuberizing and nontuberizing plants. While both the patatin structural gene and the cis-acting elements necessary for tuber-specifc expression are also present in nontuberizing species, they are arranged differently and in some cases are even on different chromosomes.
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