Location: Soybean and Nitrogen Fixation ResearchTitle: Registration of USDA-Max x Soja Core Set-1: Recovering 99% of wild soybean genome from PI 366122 in 17 agronomic interspecific germplasm lines
|EICKHOLT, DAVID - Pepsico|
|Carter Jr, Thomas|
|DICKEY, DAVID - North Carolina State University|
|DELHEIMER, JAKE - Syngenta|
|LI, ZENGLU - University Of Georgia|
Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/28/2018
Publication Date: 3/28/2019
Citation: Eickholt, D.P., Carter Jr, T.E., Taliercio, E.W., Dean, L.L., Dickey, D., Delheimer, J., Li, Z. 2019. Registration of USDA-Max x Soja Core Set-1: Recovering 99% of wild soybean genome from PI 366122 in 17 agronomic interspecific germplasm lines. Journal of Plant Registrations. 13:217-236. https://doi.org/10.3198/jpr2017.09.0059crg.
Interpretive Summary: Despite soybean’s importance to the U.S. economy, production stability can be jeopardized by depletion of genetic diversity in soy breeding programs. This depletion reduces breeding progress and imposes yield ceilings for the farmer. An important antidote to this agricultural challenge is the wild soybean. However, the wild soybean has been used only rarely by breeders, because of its overwhelmingly unagronomic vine-like plant architecture. The interspecific germplasm releases reported here effectively overcome the problem of poor plant architecture, so that genes from wild soybean can be used applied breeding. Collectively, these releases are the first successful transfer of a large portion of a wild soybean genome to adapted breeding lines. More than 99% of the wild soybean genome were transferred to 17 breeding lines. This unique set of lines should facilitate the use of the wild soybean genome in agriculture.
Technical Abstract: USDA-Max x Soja Core Set-1 is a group of 17 interspecific breeding lines developed from the hybridization of lodging-resistant soybean cultivar ‘N7103’ with wild soybean plant introduction (PI) 366122. These materials were released by the USDA-ARS and the North Carolina Agricultural Research Service to expand the North American soybean breeding germplasm pool. All breeding lines are F9-derived full sibs of group VI or VII maturity. The breeding lines were developed through bulk breeding and pedigree selection. The breeding lines are 50% wild soybean by pedigree, but SNP marker analysis (BARCSoySNP6K) of 2,455 well distributed polymorphic loci revealed that the genetic percentage of G. soja in the each breeding line ranged from 21% to 40%. When evaluated as a group, 5, 10, and 17 breeding lines recovered 83%, 98%, and 99% of polymorphic SNP marker alleles from PI 366122. The 17 breeding lines have good adaptation to the southeastern USA with seed yield ranging from 75% to 97% of the domesticated parent and 7 had elevated seed protein content. All lines had larger 100-seed weight than the G. max parent, indicating inheritance of positive alleles for this trait from the wild species. The novel genetic diversity, positive agronomic performance and improved seed composition of these lines suggest that these materials are unique and valuable genetic resources for U.S. soybean breeding.