Evaluation and Genetic Analyses of Sorghum Genetic Resources for Key Agronomic Traits
Tropical Crops and Germplasm Research
Project Number: 6635-21000-053-00
Start Date: Jun 04, 2013
End Date: Jun 03, 2018
1. Genetically-characterize sorghum accessions from Ethiopia and other nations and apply the genetic marker data to select core subsets of accessions for evaluation for host-plant resistance to anthracnose and grain mold.
2. With ARS cooperators, conduct multi-locational evaluations of selected sorghum accessions to identify potential new sources of host-plant resistance to anthracnose and grain mold pathotypes predominant in Puerto Rico and in Texas.
3. With ARS cooperators, develop experimental populations for identifying, characterizing, and mapping the genes that confer host-plant resistance to anthracnose and grain mold pathotypes and for identifying genetic markers closely linked to those resistance traits.
3a. Employ genome-wide association studies (GWAS) to identify genes that confer host-plant resistance to anthracnose.
3b. Employ GWAS to identify genes that confer host-plant resistance to grain mold pathotypes.
4. Evaluate selected sweet sorghum germplasm accessions to identify lines with robust culms, superior sugar content, dry matter production, and host-plant resistance to anthracnose.
The focus of this research is to determine the genetic control of anthracnose and grain mold, to identify molecular markers for breeding programs seeking disease resistance, and to discover new sources of resistance present in exotic germplasm. Genome-wide association studies will be employed to understand the genetic control and locate the genome regions of the anthracnose and grain mold resistance genes. The genetic and morphological characterization of sorghum collection from Ethiopia and Sudan will be applied to develop core subsets for further association studies, and to identify new sources of host resistance. Presently, sweet sorghum varieties utilized as a biofuel source have a narrow genetic base. Therefore, evaluation of sweet sorghum accessions present in the US sorghum collection will be carried out to help to identify new germplasm to broaden genetic variability available for the development of new biofuel varieties of sorghum.