1a.Objectives (from AD-416)
1. Continued selection and evaluation of soybean breeding lines for rust resistance.
2. Development of resistant germplasm.
3. Identification of qualitative and quantitative resistance genes/alleles.
4. Evaluation of the efficacy of putative resistance lines and germplasm.
1b.Approach (from AD-416)
Breeding lines have been developed from crosses with resistant lines. Evaluation and selection among these lines in field experiments with natural rust pressure will continue toward the development of new, improved resistant germplasm releases. Potential new sources of resistance will be evaluated in field screenings and new populations developed as warranted. The efficacy of single-gene resistance will be evaluated using fungicide spray/no spray field experiments. Similar fungicide experiments will be used to identify and evaluate quantitative resistance in a recombinant inbred population. Where appropriate, molecular markers will be used to identify specific genes and qualitative trait loci.
In this reporting period, field and greenhouse experiments were established at a Paraguayan research station Centro Regional de Investigación Agrícola (CRIA), in Capitán Miranda, Paraguay. Experiments included yield tests with and without fungicides, evaluation of breeding lines for rust resistance and evaluation of genetic populations segregating for rust resistance. The data have been collected and are now being analyzed. ADODR used site visit, email and telephone conferences to monitor activities of the project.