Location: Tropical Crops and Germplasm ResearchTitle: Genetic mapping of sugarcane aphid resistance in sorghum line SC112-14
|Knoll, Joseph - Joe|
|PUNNURI, SOMASHEKHAR - Fort Valley State University|
Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 7/7/2022
Publication Date: 9/16/2022
Citation: Cuevas, H.E., Knoll, J.E., Harris-Shultz, K.R., Punnuri, S. 2022. Genetic mapping of sugarcane aphid resistance in sorghum line SC112-14. Crop Science. Crop Science, 1-9. https://doi.org/10.1002/csc2.20818.
Interpretive Summary: The sugarcane aphid is a destructive pest of sorghum that has an economic impact worldwide. The identification and development of resistant sorghum germplasm is the most feasible strategy to control this pest. The evaluation of 103 recombinant inbred lines derived from the sugarcane aphid resistant line SC112-14 found a 81 kb genomic region on chromosome 6 associated with a field resistance response. This research encourages sorghum breeding programs to use SC112-14 in the development of new resistant germplasm to promote a robust control of the sugarcane aphid.
Technical Abstract: Sugarcane aphid [Melanaphis sacchari (Zehntner)] is a destructive pest that has had an economic effect on sorghum in North America since 2013. The identification, development, and use of resistant sorghum germplasm is the most feasible strategy to control the pest. Nevertheless, the genetic control of sugarcane aphid (SCA) resistance is unknown for most sorghum resistant lines. To identify the genetic regions that confer SCA resistance in sorghum line SC112-14, 103 recombinant inbred lines (RILs) derived by its cross with the susceptible line PI 609251 were evaluated for their SCA resistance response in Georgia during two consecutive years. The resistance response was determined based on two ratings (2 wk apart) for aphid population size (APS) and aphid-induced plant damage (APD) each year. Segregation for SCA resistance was observed for the first APS and both APD ratings, and the broad-sense heritability estimate ranged from .71 to .76, respectively. A quantitative trait locus analysis using a high-density linkage map of 3,852 single nucleotide polymorphisms (SNPs) detected an 81-kb genomic region on chromosome 6 that explained 50–55% of the phenotypic variation. Comparative mapping analysis found that the resistance locus in SC112-14 is located 8- and 10-cM upstream of the Henong 16 (RMES1) and Tx2783 resistance loci, respectively, and encloses the SNP Sbv3.1_06_2316351 associated in Haitian resistant lines. Therefore, the line SC112-14 is an additional SCA resistance source that can be combined or strategically used with other resistance sources to assure amore robust host plant resistance to the SCA.