ArticleFrontiers in plant science2026
A major FT/TFL1 regulatory locus (
Article in Frontiers in plant science, 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
Introduction: Flowering in cassava ( Methods: Quantitative trait locus (QTL) mapping was conducted in an F₂ population (AM1588) using a categorical 0-2 scoring scale across five time points (4, 6, 7, 8, and 9 months after planting [MAP]). Results: We identified QTL on chromosomes 1, 7, 13, and 16 with a stable and highly significant QTL on chromosome 13 (Meflwr13), reaching a maximum LOD of 20.82 and explaining up to 42.63% of the phenotypic variation. Fine mapping of Meflwr13 revealed a complex regulatory hub containing the antagonistic master floral switch genes, FLOWERING LOCUS T (FT) and TERMINAL FLOWER 1 (TFL1), along with key transcriptional modulators, including WRKY75, AP2/ERF and TEOSINTE BRANCHED 1 transcription factors. Discussion: This molecular architecture strongly suggests that flowering time in this population is controlled by the balance of promoting and repressing factors at this locus. To facilitate direct application, we validated key single nucleotide polymorphisms (SNPs) from Meflwr13 in an independent panel of 304 breeding progenitors. Three SNPs (C13_889929, C13_634483, and C13_658450) exhibited a dominant segregation pattern and showed favorable performance metrics, confirming their predictive power across diverse genetic backgrounds. These validated dominant markers provide breeders with an efficient, cost-effective tool for MAS, enabling rapid screening of seedlings in the nursery. Utilization of these markers will significantly accelerate the production of new, superior cassava varieties.
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