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When using single-trait GP models, the precision of prediction is constrained by the heritability of the target trait. Multi-trait genomic prediction can be used to improve accuracy but requires identifying secondary traits with high heritability and genetic correlation with target traits. This study assessed the efficiency of multi-trait genomic prediction models powered by secondary traits derived from high-throughput phenotyping data when predicting leaf nitrogen content (N) and specific leaf area (SLA) in diverse sorghum accessions. We hypothesized that wavelength ratios from hyperspectral data could serve as synthetic secondary traits. Therefore, we developed models for direct measures of N and SLA, plus partial least squares regression (PLSR) predictions of them (Leaf N-PLSR, SLA-PLSR), totaling four target traits. Three synthetic traits (S1, S2, S3), each a ratio of two wavelengths within the hyperspectral data, were identified based on high co-heritability with target traits. Single-trait (genomic best linear unbiased prediction (GBLUP) served as the baseline model, followed by multi-trait GBLUP models combining synthetic and target traits. Model performance was assessed using fivefold cross-validation under single-trait, CV1, and CV2 schemes. Our approach improves multi-trait genomic prediction of target traits by using synthetic traits with no intrinsic biological meaning selected through co-heritability estimation. This demonstrates that there\u2019s more useful information in the spectra than is typically utilized, and this information can be leveraged to improve multi-trait prediction of a target trait.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00122-026-05334-2","type":"journal-article","created":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T17:20:21Z","timestamp":1789752021000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Improving multi-trait genomic prediction using synthetic traits from hyperspectral data based on co-heritability"],"prefix":"10.1007","volume":"139","author":[{"given":"Ashmita","family":"Upadhyay","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ruhana","family":"Azam","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meilu","family":"Yuan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stefan","family":"Ivanovic","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John N.","family":"Ferguson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rachel E.","family":"Paul","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sanmi","family":"Koyejo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohammed","family":"El-Kebir","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1571-8528","authenticated-orcid":false,"given":"Alexander E.","family":"Lipka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6251-024X","authenticated-orcid":false,"given":"Andrew D. 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