Highlights
Natural variations in the SGT3 promoter TATA box repeats directly modulate gene expression and SGAs content in tubers, providing a novel molecular marker for low-steroidal glycoalkaloids (SGAs) breeding.
The SGT3 promoter haplotype with (TA)10 exhibits significantly higher transcriptional activity, correlating with high SGAs content, while the (TA)13 haplotype is linked to low SGAs in natural germplasms.
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