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potential to improve the processing quality of potatoes by decreasing the content of tuber glucose and fructose. We and others have shown that potatoes can be made less susceptible to cold-induced sweetening and the development of sugar end defects when biotechnology approaches are used to decrease the activity of the invertase enzyme.
sucrose is followed about one week later by higher amounts of glucose and fructose. This delay between a change in sucrose and subsequent changes in glucose and fructose has been used successfully for many years to predict undesirable trends in processing quality. continued on pg. 44
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CAN’T PREVENT SWEETENING Our recent data also shows that this same approach can delay, but not prevent, senescent sweetening in chipping potatoes. An example of the potential for improvement is shown above in Figure 4. In this case, the chips in the top two rows were made from the Wisconsin variety MegaChip and those in the bottom two rows from a lowinvertase version of MegaChip. The biotech line has a clear reduction in the onset of senescent sweetening compared to the parental line. Biotech lines with reduced vacuolar invertase activity delay onset and progression of senescent sweetening. Sucrose monitoring remains the best way to prepare. Sucrose is the substrate for the invertase enzyme, and in general, an uptick in tuber
Jim Hoffa 715-366-4181 715-340-4757
Todd Schill 715-335-4900 715-498-2020
Crop Protection Products Variable Rate Fertilizer Application Soil Fumigation • Liquid Fertilizer Bulk & Bagged Fertilizer Seed: Dyna-Gro, Dekalb, Syngenta, Mycogen BC�T September 43