Marker-assisted breeding platform for sudden death syndrome-resistant soybean cultivars

Overview

This research program focuses on developing soybean cultivars with resistance to Sudden Death Syndrome (SDS), a destructive soil-borne disease that threatens soybean yields worldwide. The work uses Marker-Assisted Breeding to identify and transfer SDS resistance into South African soybean germplasm. By combining molecular marker screening with phenotypic evaluation, the program aims to deliver locally adapted cultivars carrying validated resistance QTL, reducing yield losses for soybean producers and supporting the agricultural value chain.

The initiative addresses a critical gap in South African soybean production by systematically screening commercial cultivars for resistance, identifying suitable parental lines, and executing controlled crosses to stack resistance genes. Continuous progeny evaluation ensures that only lines with confirmed genotypic and phenotypic resistance are advanced.

Technical specifications

Key features:

• Molecular marker screening of popular commercial soybean cultivars to identify resistance-associated QTL
• Phenotypic validation of selected cultivars from both donor lines and South African germplasm
• Controlled crosses between putative South African parents and SDS resistance donor sources
• Multi-generational progeny screening using appropriate resistance markers to track QTL inheritance
• Selection of individuals carrying the most important SDS resistance genes/QTL for further crossing cycles
• Iterative breeding pipeline progressing only lines with corresponding genotypic and phenotypic results

Technology readiness level

The program is at an early-to-mid research and development stage. Genotypic screening using molecular markers linked to SDS resistance QTL is underway, and phenotypic screening of selected donor lines and South African germplasm is currently in progress to validate molecular findings. Breeding crosses and multi-generational progeny evaluation represent the next phases, with final cultivar release contingent on successful introgression and confirmation of stable SDS resistance.