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From left, Joseph Onyeka, plant pathologist and NextGen lead at National Root Crops Research Institute; Chiedozie Egesi from the International Institute of Tropical Agriculture and Cornell; Robert Kawuki from the National Agricultural Research Organization of Uganda; and Jean-Luc Jannink, from USDA Agricultural Research Service, inspect new cassava varieties during a visit to research fields in Namulonge, Uganda.

Cassava experts gather to champion ‘orphan crop’

It’s a dietary staple for millions of Africans, but cassava has traditionally received little attention from scientists and plant breeders in comparison to cash crops such as wheat and maize. The hearty root vegetable has, therefore, become something of an “orphan crop.”

But researchers – including Hale Ann Tufan, Cornell adjunct professor of plant breeding and genetics – have recently been working to find cassava a scientific “home.”

From left, Durodola Owoade, of the International Institute of Tropical Agriculture; Hale Ann Tufan, Cornell adjunct professor of plant breeding and genetics; and Ugo Chijioke, food scientist from the National Root Crops Research Institute of Nigeria, discuss cassava preferences of Nigerians and breeding characteristics like texture and taste into new varieties developed by NextGen Cassava breeders.

“We have spent the past year piloting new methods to capture preferences of smallholder cassava farmers that can be translated into actionable breeding targets,” said Tufan, the survey science lead on the Next Generation Cassava Breeding project, or NextGen Cassava

“In the coming year,” she said, “we will generate data useful for breeders and build feedback loops that bring the voices of men and women back to breeding programs.”

Tufan joined around 100 cassava breeders, gender experts and food and plant scientists from around the world in Kampala, Uganda, at NextGen Cassava’s seventh annual meeting, Feb. 18-22. They shared updates on modernizing cassava breeding programs and bringing better cassava varieties to consumers.

Led by International Programs at Cornell’s College of Agriculture and Life Sciences (IP-CALS), NextGen Cassava is unlocking the full potential of cassava and delivering improved varieties to smallholder farmers in sub-Saharan Africa.

“One major feature in this year’s meeting is a review of the progress being made by each of the African cassava breeders toward modernizing their breeding programs,” said Chiedozie Egesi, NextGen Cassava project manager and Cornell adjunct professor of plant breeding and genetics. “This will help make the breeding programs more efficient.”

Said Egesi regarding the challenge of improving a complex crop like cassava: “In the first five years of the project, we were able to prepare our tools. For the second phase of the project, we must work equally hard to deliver the results of our efforts to farmers.”

Chiedozie Egesi, left, breeding lead, and Ronnie Coffman, principal investigator for the NextGen Cassava project, review progress in delivering improved varieties of cassava to smallholder farmers in sub-Saharan Africa on a field day in Uganda.

Egesi believes the project’s success is due to the strong support it has received from local and international partners during the first phase. Egesi is excited that NextGen Cassava is expanding its efforts to help cassava breeders better understand the populations it serves.

The National Crops Resources Research Institute (NaCRRI), under the authority of the National Agricultural Research Organization (NARO) of Uganda, has been a project partner from the beginning. Despite the importance of cassava to the country’s food security, the crop has long been threatened by cassava mosaic disease and cassava brown streak virus. Without intervention, these pathogens are capable of completely devastating farmers’ fields and leaving them with nothing to harvest.

Leveraging technologies 

NextGen Cassava researchers have harnessed a variety of new breeding technologies to rapidly identify and breed varieties that can withstand the onslaught of devastating cassava diseases while matching the preferences and needs of those who consume cassava. 

By deploying the technique of genomic selection – a tool that allows plant breeders to select the most promising lines without having to wait for individual plants to grow to full maturity – they have shortened the total breeding cycle for a new variety from eight to 10 years down to five to six years. This, along with improved protocols for flowering and multiplication of planting material developed by plant biologists on the project, will allow new varieties to reach farmers’ fields sooner.

In addition to maintaining Cassavabase, an open source database that helps breeders manage information about field trials, researchers are testing how to measure cassava root quality and other physical characteristics with new methods, including the use of near infrared spectroscopy and machine learning.

An in-depth educational film about the impacts of cassava brown streak disease and cassava mosaic disease on cassava production in Tanzania, and scientific efforts to breed resistant varieties using a predictive computational technique called genomic selection.

“I am happy that, in my lifetime, I have witnessed the inclusive nature of science,” Kawuki said. “This project has provided a platform for enhanced and meaningful collaboration among many national, academic and international groups to focus on cassava for the benefit of societies that primarily depend on this crop.”

Others presenting at the meeting included: Ronnie Coffman, director of IP-CALS and principal investigator of NextGen Cassava; Tim Setter, Cornell plant biologist; Lukas Mueller, data and bioinformatics lead from the Boyce Thompson Institute; Ed Buckler, adjunct professor of plant genetics; and Jean-Luc Jannink, research division lead from the USDA Agricultural Research Service in Ithaca.

NextGen Cassava is in the second year of its second five-year phase, which includes a $35 million grant from the Bill & Melinda Gates Foundation and from UK aid, a British government initiative.

In addition to Cornell and NaCRRI, NextGen Cassava partners with the International Institute of Tropical Agriculture, and the National Root Crops Research Institute in Nigeria; the West Africa Centre for Crop Improvement in Ghana; the National Crops Resources Research Institute and Makerere University in Uganda; the Tanzania Agricultural Research Institute; the Brazilian Agricultural Research Corporation (Embrapa) in Brazil and the International Center for Tropical Agriculture in Colombia. In the U.S., collaborators include the Boyce Thompson Institute and USDA-ARS in Ithaca, and the University of Hawaii.

Samantha Hautea is a communications specialist with IP-CALS.

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Rebecca Valli