Thursday, May 23, 2013
By MEG JONES McClatchy Newspapers
STURGEON BAY, Wis. - Stored inside a nondescript building and greenhouse in Door County is the equivalent of much of the world's potato blueprints.
The United States Potato Genebank has thousands of potato varieties from all over the world. Researchers there work to make potatoes more frost- and pest-resistant.
Wisconsin is home to many things, but it's safe to say few know the globe's largest collection of wild and cultivated potato species are located here.
Most folks traveling past the Peninsular Agriculture Research Station just outside Sturgeon Bay have no idea the potato chips or french fries they gobbled at lunch were most likely developed through the efforts of the United States Potato Genebank. Potato germ plasm is sent from Sturgeon Bay to researchers throughout the world who are trying to figure out how to make potatoes more frost- and pest-resistant, easier to digest and even different colors.
"Part of our business is to find things, characterize them as unusual, determine if there's interest, publish and see if anyone wants to run with it," said John Bamberg, director of the U.S. Potato Genebank.
The gene bank is a repository of thousands of seeds and cultivars collected throughout the U.S. and world over more than six decades. The oldest potato seeds at the gene bank, which was established by Wisconsin potato farmers in 1948, date back to the early 1950s.
The Sturgeon Bay facility, part of the National Plant Germplasm System preserving the genetic diversity of plants, is the only gene bank based in Wisconsin. Gene banks are scattered across the country, including facilities for rice in Arkansas, soybeans and maize in Illinois, wheat in Idaho and tomatoes in California.
The gene banks are used to acquire, preserve and evaluate different plant varieties and then distribute them free to researchers. The potato facility houses about 5,000 seed populations and 1,000 clonal varieties. U.S. scientists and breeders outnumber international researchers seeking germ plasm by a 3 to 2 ratio. Plus horticulturists from companies such as Frito Lay work with potato germ plasm from the center.
Scientists like Shelley Jansky need access to genetic diversity to develop new varieties that are resistant to pests and extreme weather. She's working on solving the problem of verticillium wilt, a common fungus in the soil. To solve the problem, potato farmers must inject chemicals in their farm fields before planting their crops.
Through the potato gene bank, Jansky has found a wild species of potato from South America that's mostly immune to verticillium wilt.
"It's a tremendous resource that's right at my fingertips. I call them and say, 'Can you send me this, this and this?' and they send me seeds in the mail," said Jansky, a U.S. Department of Agriculture research scientist and associate professor of horticulture at the University of Wisconsin-Madison.
Jansky also is looking at starch qualities of potatoes in an effort to combat the growing problem of obesity.
"What we're interested in doing is finding potato starch that's not as digestible, that acts more like a fiber than instant energy. It's more important for us to get fiber than instant glucose, and we're finding wild varieties that have different starches," Jansky said.
Why go to all this trouble? Because potatoes are the most valuable vegetable in the U.S. -- $4 billion in potato chips alone. And potatoes are considered the fourth most important crop worldwide, behind rice, wheat and corn.
At the genebank building, seeds are kept in small paper sacks in a walk-in cooler kept at 40 degrees. One room has rows and rows of test tubes filled with green potato plants snaking up toward the artificial light.
On a recent day, Bamberg checked test tubes labeled with names of potato varieties including jasmine, iris, red Pontiac, majestic, golden flesh and yema de huevo. The yema de huevo variety, which translates to "egg yolk" in Spanish, features a bright squash-like yellow potato, which is in demand among consumers in South America, Bamberg said.
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