Housed in Canada’s centre of excellence for potato research along the Saint John River Valley in Fredericton, N.B., Agriculture and Agri-Food Canada’s scientists maintain a living library of nearly 180 potentially high-value potato gene resources. Canada’s potato gene bank, or Canadian Potato Genetic Resources, is part of an international commitment to global food security.
If disease or a natural disaster strikes and potato crops are devastated, researchers from anywhere in the world can turn to the gene bank to rebuild the stock. Researchers can also call on the gene bank for resources to help them develop stronger, more disease-resistant and environmentally-resilient varieties
“We preserve some potato varieties that are of unique value to northern latitude climates, varieties that are adapted to shorter seasons with longer daylight hours,” says Dr. Benoit Bizimungu, gene resources curator with Agriculture and Agri-Food Canada (AAFC). “Only certain star varieties are grown by the potato industry, so in the interest of preserving genetic diversity, an important part of our role as gene bank curators is to back up our genetic resources.”
Unlike other gene banks that preserve seed-propagated crops like grains, the potato gene bank is made up of live tissue cultures or tubers which are perishable and require constant maintenance. Plantlets are grown in aseptic conditions in test tubes that are stored in temperature-controlled growth chambers for six to eight weeks at a time. The collection is then refreshed, continuously monitored and periodically tested for contaminations. Microtubers, or tiny potatoes about the size of a raisin, are also produced in test-tubes and preserved for up to a year as a backup. A duplicate collection of microtubers is kept at AAFC’s Saskatoon Research and Development Centre.
“It’s well worth it,” says Dr. Bizimungu of the work involved in conserving high-value potato genetic diversity. “There are many potato varieties that aren’t grown today that have traits that are of current or future interest to researchers and educators. Preserving these varieties ensures valuable attributes, and even those with known susceptibility to certain diseases are kept for the development of future, better varieties.”
The collection is comprised of heritage varieties, modern Canadian-bred varieties, as well as strains known to show differential reactions to certain diseases and breeding lines with specific traits scientists are interested in studying. In addition to Canadian varieties, the collection also includes varieties from the U.S., Peru and many European countries including Ireland, the Netherlands and Estonia.
Canadian Potato Genetic Resource is part of Plant Gene Resources Canada (PRGC). The mandate of PGRC is to acquire, preserve and evaluate the genetic diversity of crops and their wild relatives with focus on germplasm of economic importance or potential for Canada.