Worldwide collaboration to breed better dry beans
September 24, 2018
On a recent warm, late-summer day, as many dry edible bean growers in Nebraska were watching their fields turn color and preparing for harvest, four scientists paced through a bean field north of Scottsbluff made up of hundreds of tiny plots, each one a different line or type of bean — representing different varieties of dry beans from all over the world.
Farmers in this area grow mainly pinto beans, great northern and light red kidneys, and smaller amounts of others such as black beans, navies and chickpeas.
But these plots, part of the research fields at the University of Nebraska's Panhandle Research and Extension Center, consist of hundreds of different lines of many types of beans, from all over the world. They are part of a collaborative effort among plant breeders from UNL, other land-grant universities, the U.S. Department of Agriculture and other organizations to improve the genetics of dry edible beans grown in Nebraska and worldwide.
Dry bean lines are tested in these plots to see if their genes might be introduced into bean lines sold to Nebraska farmers to make their crops more resistant to diseases such as bacterial blight; increase their tolerance to heat and drought; or produce plants with an upright architecture, suitable for direct harvest by combine. Other, ever-important, traits are early maturation, yield, seed size and seed quality.
“We’re going to try to understand the genetics of this yellow color and genetics of cooking time and identify good materials that we can use for breeding to get good agronomic characteristics, because a lot of these yellows are susceptible to many diseases.”
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Carlos Urrea, dry bean breeding specialist at the UNL Panhandle Research and Extension Center, oversees these plots. Urrea regularly collaborates with plant breeders from the U.S. Department of Agriculture's Agricultural Research Service, other universities and international organizations such as the International Center for Tropical Agriculture (CIAT).
On this day, Urrea and three USDA plant breeders from Washington, Michigan and Puerto Rico were inspecting the plots, looking for plants that showed promise. They look for genetic material that can be introduced into ongoing breeding efforts at Nebraska and elsewhere.
The plot tour near Scottsbluff is an annual routine, part of the process of seeing how the many different breeding lines perform under different conditions. The researchers also take the opportunity to share information about each other's projects. The collaboration has been recognized with the Excellence in Multistate Research Award by the Western Association of Agriculture Experiment Station Directors in 2009.
Market classes in these plots include pinto, great northern, small blacks, reds, light-red kidney, yellows, cranberries, and an assortment of others (Calima, Rozi Koko, Kablanketi, etc.) from different continents. The collaborative projects represented include the Western Regional Bean Trials (Nebraska, Colorado, Idaho and Washington); the Midwest Regional Performance Nursery (Nebraska, Michigan, North Dakota, Colorado and Wyoming); the Cooperative Dry Bean Nursery (nine U.S. states, one Canadian province); the shuttle bean breeding nursery with Puerto Rico; and a dry bean drought nursery and white mold monitoring nursery, each involving several states.
When the bean breeders tour cooperative plots such as Urrea's at Scottsbluff, they are looking for plants that demonstrate a combination of traits such as moderate to early maturity, good pod set, good yield (more seeds in the pods), uniformity of maturity and less disease, according to Phil Miklas of USDA ARS in Prosser, Wash.
As the plot inspection proceeds, he noted that the beans in a particular plot are later in maturity and un-adapted to this region. "These materials actually were bred in Tanzania and selected in Tanzania. What we're looking for here are potential gems — materials that have been selected in a wildly, vastly different environment that might bring in some new genetic diversity into the large-seeded kidneys and cranberry beans that we grow in the U.S."
Miklas said that each of the four who are touring the fields have projects in east Africa. "As part of the research community, we share materials and work together and try to help each other succeed in developing better cultivars." A USAID project designed to help feed people in Africa might also contribute genetic material that helps fight a plant disease in America, he said.
Tim Porch is a research geneticist with USDA-ARS in Mayaguez, Puerto Rico, who has worked on the shuttle breeding project for 11 years with Urrea. "We select at locations in Nebraska in the summertime and Puerto Rico in the winter time," he said. "We're pulling in other sources of drought tolerance from the South American and Central American germplasm. So there are crosses between two races of these smaller seed beans. By doing that we're expanding the diversity of these seed classes and also bringing in other sources of drought tolerance. Also with climate change we're bringing in heat tolerance as well. And we've been selecting for disease resistance for common bacterial blight at both locations."
Karen Cichy of USDA-ARS in East Lansing, Mich., is working on a breeding project involving yellow beans.
"They're a minor market class, but we're interested in them because we've found some of them have a very fast cooking time and we've found that they have some interesting nutritional properties," she said, especially high iron bioavailability. Working with a germplasm collection of 300 different yellow beans from a number of market classes (Mayocoba, Canario, Azufrado, etc.) she is trying to breed yellow beans for the United States.
"We're going to try to understand the genetics of this yellow color and genetics of cooking time and identify good materials that we can use for breeding to get good agronomic characteristics, because a lot of these yellows are susceptible to many diseases. Nebraska is one of three sites we're testing these genetics at this year."
She said the U.S. acreage of yellow beans is fairly small compared to market classes such as pintos and kidneys, but there is potential. "They are becoming more popular, especially with Latinos. Different types of yellow are important commercially in Mexico and east Africa."
The bean-breeding collaborative efforts have been going on for around 50 years, Urrea said. He has been the dry bean breeding specialist for UNL at Scottsbluff for almost 14 years. The number of dry bean lines tested varies a little from year to year.
The dry beans that researchers are seeing recently have a better plant architecture than 15 years ago, Urrea said. They are more upright, suitable for direct harvest by combine. Some of the beans carry multiple genes for resistance to more diseases than in the past. Over the years, the number of market classes represented in the plots has increased.
One advantage of collaborating with other researchers, Urrea explained, is that when he grows dry bean lines from other programs, and sees their beans performing well in western Nebraska, he can ask permission to introgress those lines into his breeding program through hybridization. This sharing and collaborative spirit, evident among the four breeders, and which benefits everyone was refreshing to see.