The Mighty Spud - Sandy Knapp, Glenn Bryan and Susan Calman

What It Covers

Botanist Sandy Knapp and geneticist Glenn Bryan explore potato science, revealing 104 wild species exist beyond the single cultivated species, tracing domestication to Lake Titicaca 8-10 thousand years ago, and discussing future diploid breeding innovations.

Key Questions Answered

• •Genetic complexity: Cultivated potatoes are tetraploid with four chromosome sets instead of two, making breeding take longer than wheat or rice. Each seed produces completely different offspring, requiring vegetative propagation through tubers to maintain varieties consistently.
• •Species diversity misconception: All supermarket potato varieties belong to one species, Solanum tuberosum, representing just one of 104 wild potato species. Andean farmers cultivate over 1,000 named varieties with specific culinary purposes, from soup-making to freeze-dried chuno production.
• •Disease resistance breeding: Wild Mexican potato species were crossed with cultivated varieties after the 1845 Irish famine to introduce late blight resistance genes. This cross-species breeding technique continues improving contemporary potato disease resistance using genetic material from related wild species.
• •Diploid breeding revolution: Researchers pursue converting tetraploid potatoes to diploid seed-propagated crops, enabling storage as lightweight seeds instead of refrigerated tubers. This transformation would particularly benefit Asia and East Africa where tuber storage infrastructure remains problematic.