ArticleTAG. Theoretical and applied genetics. Theoretische und angewandte Genetik2025
Creation of new rice germplasm with cross-resistance to auxin herbicides picloram and dicamba by genome editing of OsAFB4.
Article in TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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2 citing papers in PubMed.
- Genetically Modified Plants in Agriculture.Biology · 2026Review
- Time-resolved transcriptomic analysis suggests candidate hub gene modules and putative regulatory pathways in tobacco under dicamba stress.Frontiers in plant science · 2026Article
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Authors and funding
12 authors.
Funding
Abstract
key messageGenome Editing of OsAFB4 in rice cultivar Jiahe212 confers cross-resistance to synthetic auxin herbicides picloram and dicamba without reducing grain yield, providing a novel germplasm for herbicide-resistant rice breeding. Synthetic auxin herbicides (SAHs) are widely employed in global agriculture owing to low toxicity and high efficiency in weed management. Mutations in OsAFB4, an AUXIN SIGNALING F-BOX gene, led to specific resistance to SAH picloram in rice. However, potential application of OsAFB4 modification for resistance to other SAHs and its effect on agronomic traits in rice remain uncharacterized. In this study, we employed CRISPR/Cas9-mediated genome editing to generate OsAFB4 mutations in the elite commercial rice cultivar Jiahe212 (JH212). Hydroponic-culture experiments showed that Osafb4 mutant lines exhibited significant resistance to both SAHs: picloram and dicamba. Promoter activity assays using a pOsAFB4:GUS reporter line revealed that SAH treatments induced significant upregulation of GUS expression specifically in shoot apices. Under picloram or dicamba treatment, expressions of OsIAA1, OsIAA3, OsIAA9 and OsIAA20 were significantly upregulated in wild-type plants, while remarkably suppressed in Osafb4 mutants, revealing a critical role for OsAFB4 in regulating auxin-responsive IAA genes during OsAFB4-mediated sensitivity to SAH. Selected for field trials, the Cas9-free Osafb4-13 mutant line exhibited robust resistance to both picloram and dicamba without reducing grain yield compared to untreated controls. This study provides a new cross-herbicide-resistant rice germplasm without reducing grain yield by targeted editing of OsAFB4.
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