|PATIL, NIKHIL - Texas A&M University|
|HOFFMANN, LEO - Texas A&M University|
|PERUMAL, RAMASAMY - Kansas State University|
|BOYLES, RICHARD - Clemson University|
|DALBERG, JEFFREY - Retired ARS Employee|
|Klein, Robert - Bob|
|KLEIN, PATRICIA - Texas A&M University|
|ROONEY, WILLIAM - Texas A&M University|
Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/2/2022
Publication Date: N/A
Interpretive Summary: Sorghum is an essential cereal crop utilized throughout the world for its resilience to drought and temperature stresses. The crop is high yielding and is used for food, feed, and fuel products. However, improved breeding lines are limited within the United States, and many sorghum lines lack significant genetic diversity. To address these constraints, diverse breeding lines utilizing sources throughout the world were developed and deposited into the ARS Genetic Resource Information Network. The populations consists of 2189 unique sorghum lines that can be used as breeding resources for improvement of sorghum.
Technical Abstract: A sorghum [Sorghum bicolor (L.) Moench] backcross-nested association mapping (BC-NAM) resource comprised of 30 populations totaling 2189 BC1F4 lines using an elite B or R line as the recurrent parent. The populations were derived from 27 unadapted founder lines that were backcrossed to either BTx623 or RTx436 based on the fertility reaction score of the exotic founder. These exotic founder lines were selected based on agronomic fitness, breeder desirability, and genetic diversity representing diverse races. Thirty populations were developed from 27 founder parents - three of the founder parents were backcrossed to both recurrent parents to provide a genetic bridge across the populations. Each of the 30 BC-NAM populations consists of 45-100 BC1F4 lines selected for standard agronomic fitness, and each population was genotyped by genotype-by-sequencing with ~12,000 SNPs. These BC-NAM populations with a higher adaptation index and novel genetic diversity have application in genetic research and sorghum breeding programs to diversify their R and B line parental heterotic pools.