Integrated phenotypic analysis, predictive modeling, and identification of novel trait-associated loci in a diverse Theobroma cacao collection
Abstract Background Cacao (Theobroma cacao L.) breeding and improvement rely on understanding germplasm diversity and trait architecture. This study characterized a cacao collection (173 accessions) evaluated in Puerto Rico, examining phenotypic diversity, trait interrelationships, and performing co...
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2025-08-01
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| Series: | BMC Plant Biology |
| Online Access: | https://doi.org/10.1186/s12870-025-07128-y |
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| author | Insuck Baek Minhyeok Cha Seunghyun Lim Brian M. Irish Sookyung Oh Jishnu Bhatt Rakesh K. Upadhyay Moon S. Kim Lyndel W. Meinhardt Sunchung Park Ezekiel Ahn |
| author_facet | Insuck Baek Minhyeok Cha Seunghyun Lim Brian M. Irish Sookyung Oh Jishnu Bhatt Rakesh K. Upadhyay Moon S. Kim Lyndel W. Meinhardt Sunchung Park Ezekiel Ahn |
| author_sort | Insuck Baek |
| collection | DOAJ |
| description | Abstract Background Cacao (Theobroma cacao L.) breeding and improvement rely on understanding germplasm diversity and trait architecture. This study characterized a cacao collection (173 accessions) evaluated in Puerto Rico, examining phenotypic diversity, trait interrelationships, and performing comparative analyses with published Trinidad and Colombia datasets. We also developed machine learning (ML) models for yield prediction and identified yield-associated SNP markers. Results The cacao collection showed significant phenotypic variation and strong intra-collection trait correlations. Comparative analyses revealed conserved trait responses across environments, notably linking susceptibility to black pod rot in Puerto Rico with Witches' Broom Disease in Colombia, suggesting a broad-spectrum disease response mechanism. Machine learning models effectively modeled yield, quantifying a hierarchy of predictor importance, with ‘Total pods’, ‘Infection rate’, and ‘Pod weight’ being the most influential. Integrating existing SNP data for 28 common accessions, multiple SNPs were identified as significantly associated with key horticultural traits, including ‘Total pods’, ‘Infection rate’, and ‘Yield’ (FDR < 0.01). Notably, a single genetic marker on chromosome 5 (TcSNP475), located within a putative zinc finger stress-associated protein gene (Tc05_t008610), was associated with both ‘Total pods’ and ‘Yield’, representing a prime target for marker-assisted selection. Conclusions This research provides a detailed characterization of a wide germplasm collection, robust yield predictors, and a suite of novel trait-linked genetic markers, offering valuable resources for cacao breeding. These integrated findings will provide a solid foundation for targeted breeding strategies and deeper molecular investigations into the mechanisms underpinning yield and stress resilience in this vital global crop. |
| format | Article |
| id | doaj-art-784c7087427f407f84b6fddadbcc4835 |
| institution | Kabale University |
| issn | 1471-2229 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Plant Biology |
| spelling | doaj-art-784c7087427f407f84b6fddadbcc48352025-08-20T03:45:51ZengBMCBMC Plant Biology1471-22292025-08-0125111710.1186/s12870-025-07128-yIntegrated phenotypic analysis, predictive modeling, and identification of novel trait-associated loci in a diverse Theobroma cacao collectionInsuck Baek0Minhyeok Cha1Seunghyun Lim2Brian M. Irish3Sookyung Oh4Jishnu Bhatt5Rakesh K. Upadhyay6Moon S. Kim7Lyndel W. Meinhardt8Sunchung Park9Ezekiel Ahn10Environmental Microbial and Food Safety Laboratory, Agricultural Research Service, Department of AgricultureEnvironmental Microbial and Food Safety Laboratory, Agricultural Research Service, Department of AgricultureSustainable Perennial Crops Laboratory, Agricultural Research Service, Department of AgriculturePlant Germplasm Introduction and Testing Research Unit, Agricultural Research Service, Department of AgricultureEnvironmental Microbial and Food Safety Laboratory, Agricultural Research Service, Department of AgricultureSustainable Perennial Crops Laboratory, Agricultural Research Service, Department of AgricultureDepartment of Natural Sciences, College of Arts and Sciences, Bowie State UniversityEnvironmental Microbial and Food Safety Laboratory, Agricultural Research Service, Department of AgricultureSustainable Perennial Crops Laboratory, Agricultural Research Service, Department of AgricultureSustainable Perennial Crops Laboratory, Agricultural Research Service, Department of AgricultureSustainable Perennial Crops Laboratory, Agricultural Research Service, Department of AgricultureAbstract Background Cacao (Theobroma cacao L.) breeding and improvement rely on understanding germplasm diversity and trait architecture. This study characterized a cacao collection (173 accessions) evaluated in Puerto Rico, examining phenotypic diversity, trait interrelationships, and performing comparative analyses with published Trinidad and Colombia datasets. We also developed machine learning (ML) models for yield prediction and identified yield-associated SNP markers. Results The cacao collection showed significant phenotypic variation and strong intra-collection trait correlations. Comparative analyses revealed conserved trait responses across environments, notably linking susceptibility to black pod rot in Puerto Rico with Witches' Broom Disease in Colombia, suggesting a broad-spectrum disease response mechanism. Machine learning models effectively modeled yield, quantifying a hierarchy of predictor importance, with ‘Total pods’, ‘Infection rate’, and ‘Pod weight’ being the most influential. Integrating existing SNP data for 28 common accessions, multiple SNPs were identified as significantly associated with key horticultural traits, including ‘Total pods’, ‘Infection rate’, and ‘Yield’ (FDR < 0.01). Notably, a single genetic marker on chromosome 5 (TcSNP475), located within a putative zinc finger stress-associated protein gene (Tc05_t008610), was associated with both ‘Total pods’ and ‘Yield’, representing a prime target for marker-assisted selection. Conclusions This research provides a detailed characterization of a wide germplasm collection, robust yield predictors, and a suite of novel trait-linked genetic markers, offering valuable resources for cacao breeding. These integrated findings will provide a solid foundation for targeted breeding strategies and deeper molecular investigations into the mechanisms underpinning yield and stress resilience in this vital global crop.https://doi.org/10.1186/s12870-025-07128-y |
| spellingShingle | Insuck Baek Minhyeok Cha Seunghyun Lim Brian M. Irish Sookyung Oh Jishnu Bhatt Rakesh K. Upadhyay Moon S. Kim Lyndel W. Meinhardt Sunchung Park Ezekiel Ahn Integrated phenotypic analysis, predictive modeling, and identification of novel trait-associated loci in a diverse Theobroma cacao collection BMC Plant Biology |
| title | Integrated phenotypic analysis, predictive modeling, and identification of novel trait-associated loci in a diverse Theobroma cacao collection |
| title_full | Integrated phenotypic analysis, predictive modeling, and identification of novel trait-associated loci in a diverse Theobroma cacao collection |
| title_fullStr | Integrated phenotypic analysis, predictive modeling, and identification of novel trait-associated loci in a diverse Theobroma cacao collection |
| title_full_unstemmed | Integrated phenotypic analysis, predictive modeling, and identification of novel trait-associated loci in a diverse Theobroma cacao collection |
| title_short | Integrated phenotypic analysis, predictive modeling, and identification of novel trait-associated loci in a diverse Theobroma cacao collection |
| title_sort | integrated phenotypic analysis predictive modeling and identification of novel trait associated loci in a diverse theobroma cacao collection |
| url | https://doi.org/10.1186/s12870-025-07128-y |
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