ArticleMolecular breeding : new strategies in plant improvement2026
Multivariate colorimetric phenotyping reveals genetic loci associated with soybean seed coat pigmentation and epicatechin accumulation.
Article in Molecular breeding : new strategies in plant improvement, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Seed coat pigmentation in soybean is controlled by complex genetic mechanisms involving structural and regulatory genes in the flavonoid biosynthetic pathway. Although brown seed coats are often associated with epicatechin (EC) accumulation, visual classification alone cannot reliably predict EC content. To quantitatively characterize seed coat coloration and its relationship with EC accumulation, we evaluated multivariate colorimetric traits (L*, a*, and b* values in the CIELAB color space) in 235 recombinant inbred lines (RILs) derived from Jinpung (yellow seed coat) and IT109098 (greenish-brown seed coat). Principal component analysis (PCA) of L*, a*, and b* values revealed that genotypes with detectable EC were confined to specific regions of the multivariate color space, indicating that EC accumulation is associated with coordinated color balance rather than overall pigmentation intensity. RILs with high EC content showed significantly lower L* (32.76 ± 2.49) and b* (13.18 ± 2.66) values and higher a* values (5.47 ± 1.31) than those with low EC content. Quantitative trait loci (QTL) mapping identified thirteen loci associated with L*, a*, b*, and principal component scores across chromosomes 01, 05, 06, 08, and 19 A major locus on chromosome 08 near the classical Supplementary Information: The online version contains supplementary material available at 10.1007/s11032-026-01655-8.
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