ArticleTAG. Theoretical and applied genetics. Theoretische und angewandte Genetik2026
IbMYB1-4 positively regulates purple stem and influences leaf color via dosage effect of gene expression in sweetpotato (Ipomoea batatas (L.) Lam.).
Article in TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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Who cites it
1 citing paper in PubMed.
- Sweet Potato Gene Clusters Control Anthocyanin Biosynthesis and Leaf Morphology.Plant biotechnology journal · 2026Article
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11 authors.
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Abstract
In sweetpotato, the quantitative variation of anthocyanin accumulation produces a continuous color spectrum that underpins both ornamental appeal and nutritional quality across cultivar species. Although previous studies have established that the expression of IbMYB1 is essential for purple pigmentation in germplasm, this gene exists in multiple copies within the polyploid genome, rendering the resulting genetic complexity incompletely understood to date. Here, we found that hexaploid genome of sweetpotato contains at least five IbMYB1 copies, designated IbMYB1-1, IbMYB1-2a/b, IbMYB1-3 and IbMYB1-4. Gene sequence cloning, transgenic complementation and high-resolution spatial expression analyses revealed that the previously uncharacterized IbMYB1-4 is specifically expressed in the stem cortex and leaf epidermis, where it orchestrates the differential accumulation of distinct anthocyanin monomers, resulting in vines that range from purple to near-black. Yeast one-hybrid screening and dual-luciferase reporter assays confirmed that the bHLH transcription factor IbbHLH2 binds to a canonical G-box motif within the IbMYB1-4 promoter, thereby reinforcing IbMYB1-4 expression. Reciprocal F
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