This summer, Michigan State University (MSU) continues to push the boundaries of potato science, with a cutting-edge research project led by graduate student Joseph Ifeanyi Ulasi under the guidance of renowned potato breeder Dr. David Douches. The project, titled “Introgression and Pyramiding of Novel Genes for Diploid Potato Breeding,” represents a pivotal effort to strengthen late blight resistance in diploid potato lines.
A Persistent Threat Requiring Genetic Innovation
“Our project aims to enhance late blight resistance in diploid potato breeding by integrating novel resistance genes from various Solanum species with existing resistance genes,” Ulasi explained.
Late blight, caused by Phytophthora infestans, continues to pose a serious global threat to potato production. The disease is infamous for its role in the 19th-century Irish Potato Famine and remains a costly challenge for growers worldwide. The MSU research team is addressing this threat at the genetic level, with an emphasis on natural resistance traits found in wild potato relatives.
Solanum pinnatisectum: A Source of Resistance—But Not Without Challenges
One such wild species, Solanum pinnatisectum, has garnered attention for its robust resistance to late blight. It is rich in Rpi genes—key genetic components that provide resistance to the pathogen. However, this species poses a significant breeding challenge: it does not readily cross with cultivated potato varieties.
Solanum verrucosum: The Unsung Hero of Gene Transfer
To overcome this genetic bottleneck, the MSU team is leveraging the potential of Solanum verrucosum, a species known for its unique role as a genetic intermediary. Described as a “bridge species,” S. verrucosum was strategically selected by program alumnus William Behling. It acts as a conduit, enabling the successful transfer of resistance genes from S. pinnatisectum into cultivated lines by facilitating gene introgression.
A Multifaceted Role: Scientist and Educator
Joseph Ulasi’s role is central to this ambitious initiative. Working hands-on in the lab, he is developing and evaluating breeding lines that incorporate this newly stacked resistance. In addition to his laboratory work, Ulasi also shares his passion for potato breeding with MSU students—having recently served as a Teaching Assistant to mentor the next generation of plant scientists.
Part of a Long-Term Vision Supported by Project GREEEN
This work is part of a broader research legacy at MSU that stretches back years. Since 2018, the university’s potato breeding program has been backed by Project GREEEN—a collaborative plant agriculture initiative supporting innovation in Michigan’s specialty crops. The current project continues to build on that momentum, aiming to deliver varieties that are not only high-yielding but also genetically fortified against major diseases.
For further background on the roots of this work, readers are encouraged to explore the foundational efforts funded by Project GREEEN here.
Source: Michigan State University. Original article here
Cover image: Credit Michigan State University
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