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Article Abstract
Plant architecture is a key determinant of crop yield, and understanding the genetic basis of its regulation is crucial for crop improvement. BLADE-ON-PETIOLE (BOP) genes are known to play a fundamental role in shaping plant architecture across diverse species. In this study, we demonstrate pleiotropic effects of the barley BOP gene Uniculme4 (Cul4) on various aspects of plant architecture, including plant height, culm diameter, and grain traits. Accordingly, Cul4 is broadly expressed in different tissues and developmental stages. Comparing transcriptome profiles of cul4 mutant and wild-type plants, we uncover a novel link between Cul4 and the jasmonic acid (JA) biosynthetic pathway. Our findings demonstrate that proper Cul4 function is required to repress JA biosynthesis, with cul4 mutants exhibiting increased levels of JA and its precursor 12-oxo-phytodienoic acid. Up-regulation of WRKY and bHLH transcription factors shows JA signalling is also impacted by Cul4. Additionally, our study sheds light on the role of Cul4 in flowering time regulation, potentially through its interaction with florigen-like genes. This research enhances our understanding of the mechanisms and pathways acting downstream of BOP genes.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC12116171 | PMC |
| http://dx.doi.org/10.1093/jxb/eraf068 | DOI Listing |
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