Marker-assisted selection for disease-resistant and productive cacao materials
Validation of molecular markers identified through GWAS to accelerate cacao breeding. Using ddPCR technology to confirm SNP markers linked to disease resistance and high productivity, enabling early selection of superior cacao genotypes in juvenile phases under greenhouse conditions.
Overview
This research focuses on validating molecular markers discovered through genome-wide association studies (GWAS) to enable marker-assisted selection of cacao materials with disease resistance and high productivity. By identifying genetic markers linked to key agronomic traits, breeders can select superior cacao genotypes at early juvenile stages under greenhouse conditions, significantly accelerating breeding programs and reducing the time and cost required to develop improved varieties.
The work addresses critical cacao diseases caused by the fungi Moniliophthora roreri and M. perniciosa, which significantly impact cacao productivity. The approach allows breeders to screen young plants for desirable traits before field deployment, transforming traditional breeding timelines.
Technical specifications
Key features:
- GWAS performed on 109 diverse cacao genotypes using 9,000 SNPs discovered through genotyping-by-sequencing (GBS)
- Identification of seven candidate genes associated with disease resistance and two genes associated with yield
- Validation using droplet digital PCR (ddPCR) technology for high-precision genotyping
- Primer and probe design for nine selected markers
- Molecular screening to analyze allelic dosage in parental and recombinant populations
- Evaluation of 13 parental genotypes and 22 recombinant progenies with known resistance and productivity profiles
The ddPCR technique provides absolute quantification of target DNA sequences, offering superior precision for validating genotype-phenotype correspondence compared to conventional methods.
Technology readiness level
The research is at an advanced validation stage. The GWAS analysis has been completed and candidate genes identified. Thirteen parental genotypes with confirmed disease resistance and productivity have been characterized, and 22 recombinant progenies have been evaluated for these traits. The next phase involves designing primers and probes for the nine selected markers and conducting large-scale genotyping using ddPCR technology to validate marker-trait associations. The study is expected to take approximately one year to complete, with the goal of implementing validated markers directly into cacao breeding programs.
About Agrosavia
AGROSAVIA is Colombia’s public agricultural R&D corporation near Bogotá, operating a nationwide network of research centers and experimental farms. Co-located labs, greenhouses, pilot plots and living collections—including national germplasm banks—enable rapid prototyping and access to diverse genetic resources. An outreach and innovation network links companies and producer groups to multi-site trials and farmer engagement across varied agroecological zones. Research is backed by the Government of Colombia—principally the Ministry of Agriculture and Rural Development—with competitive national and international funding, and a technology transfer function to structure collaboration and IP.
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