“There’s so much great food yet to discover that we can grow, so I just love discovering new varieties, crops, things that our customers and myself have never tried before.” – Alex Weiser, 2013 Science & Food course
Alex Weiser stopped by the 2013 Science & Food course to share his love of potatoes and other tasty veggies. Alex Weiser digs potatoes. Literally. As a grower for Weiser Family Farms, Alex Weiser
is known for his year-round supply of tasty (and colorful) potatoes. All Reds, Butterballs, Purple Peruvians, Red Thumbs, and Russian Banana Fingerlings adorn Weiser’s farmers’ market stalls across Southern California. So when Weiser stopped by the 2013 Science & Food course
, he just had to bring a classic potato salad for everyone to try. And what a potato salad it was! With yellow, purple, and red potatoes, Weiser’s tri-color potato salad was as visually appealing as it was delicious. Eating that potato salad got us thinking about themolecules responsible for the creamy yellows, bright reds, and deep purples of Weiser’s potatoes. Although many colorful molecules give potatoes their vibrant hues, all of these molecules represent just two large classes of chemical pigments known as carotenoidsand anthocyanins. Carotenoids are typically associated with carrots rather than potatoes, thanks to the well-known carotenoid beta-carotene. But other types of carotenoids such as lutein, zexanthin, and vialaxanthin are commonly found in potatoes , and at high enough concentrations these molecules can give potatoes a yellow appearance. Anthocyanins give red and purple potatoes their striking color and are responsible for many of the red and purple colors found in nature. The bold reds of berries, the deep purples and reds of autumn leaves, and the bright hues of many flowers all come courtesy of anthocyanins. In fact, two anthocyanins found in potatoes are named after flowers: peonidin (peonies) and petunidin (petunias) .
But what makes one potato variety purple and another red? The difference comes down to small variations in the potatoes’ DNA. Several genes control not only which pigments are created (red, purples, and/or yellows) but also how these pigments are distributed throughout the potato (skin and/or flesh) . For example, Red Clouds
have red skin and white flesh, while Purple Peruvians
have purple pigment distributed throughout their skin and flesh. Through a bit of creative breeding, potato growers can manipulate these genes to create a wide variety of colorful potatoes. Take, for example, the Weiser Family Farms Laker Baker
, a fancy “chimera” breed that sports a unique, two-color pigment pattern.
Laker Bakers! Photo credit: Weiser Family Farms While we can’t all be potato breeders like Alex Weiser, we can always play with nature’s colorful chemicals in the kitchen. Start experimenting with carotenoids and anthocyanins with this recipe for Weiser Family Farm’s tri-color potato salad. Tri-Color Potato Salad From Weiser Family Farms
2 cups peewee Russian Banana Fingerling potatoes, halved lengthwise (about 10 ounces) 2 cups peewee French Fingerling potatoes, quartered (about 10 ounces) 2 cups peewee Purple Fingerling potatoes, halved lengthwise (about 10 ounces) 1/4 cup finely chopped red onion 2 tablespoons chopped fresh parsley 1 tablespoon chopped fresh dill 1 tablespoon chopped fresh chives 3 hard-cooked large eggs, finely chopped 1/4 cup red wine vinegar 2 tablespoons olive oil 1 1/4 teaspoons salt 2 teaspoons Dijon mustard 1/2 teaspoon freshly ground black pepper 1 garlic clove, minced 1. Place fingerling and red potatoes in a saucepan; cover with water. Bring to a boil. Reduce heat; simmer 15 minutes or until tender. Drain; cool slightly. Place potatoes in a large bowl. 2. Place blue potatoes in a saucepan; cover with water. Bring to a boil. Reduce heat; simmer 10 minutes or until tender. Drain; cool slightly. Add blue potatoes, onion, parsley, dill, chives, and eggs to bowl; toss gently. 3. Combine vinegar and remaining ingredients. Pour over potato mixture; toss gently to combine. Serve warm, at room temperature, or chilled. References Cited
Brown CR (2005) Antioxidants in potato. Am J Potato Res 82: 163–172. doi:10.1007/BF02853654.
Jong HD (1991) Inheritance of anthocyanin pigmentation in the cultivated potato: A critical review. Am Potato J 68: 585–593. doi:10.1007/BF02853712.
About the author:
Liz Roth-Johnson is a Ph.D. candidate in Molecular Biology at UCLA. If she’s not in the lab, you can usually find her experimenting in the kitchen. Read more by Liz Roth-Johnson