ArticleFunctional & integrative genomics2026
Positive regulatory role of EuWRKY1 in the biosynthesis of Eucommia ulmoides rubber.
Article in Functional & integrative genomics, 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
Eucommia ulmoides is a cold-tolerant rubber-producing tree capable of synthesizing trans-polyisoprene rubber in its leaves, bark, and fruit pericarp. The WRKY family constitutes a major class of plant transcriptional regulators and is widely implicated in controlling specialized metabolic pathways. However, for most E. ulmoides WRKY genes, their regulatory contributions to rubber formation are still poorly defined. In this study, we obtained the full-length EuWRKY1 cDNA from E. ulmoides by RACE and assessed its function using genetic transformation. Sequence alignment revealed that EuWRKY1 shares 62.37% homology with HbWRKY1, a key regulator of rubber biosynthesis in Hevea brasiliensis. Subcellular localization analysis showed that EuWRKY1 is predominantly nuclear, and transcriptional activation assays confirmed its transactivation capability. Overexpression of EuWRKY1 in E. ulmoides significantly increased rubber filament and rubber particle numbers and elevated leaf rubber content, accompanied by markedly higher expression of key rubber biosynthesis-related genes, including EuSRPP6 and EuSRPP7. These results indicate that EuWRKY1 acts as a positive regulator of rubber biosynthesis in E. ulmoides, providing new insights into the transcriptional regulatory network underlying trans-polyisoprene formation and offering a potential target for molecular improvement to enhance rubber yield.
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