ArticleMolecular plant pathology2025
Phenylacetate Hydroxylase SsPhacA Modulates p-Coumaric Acid Accumulation to Regulate the Mating/Filamentation of Sporisorium scitamineum.
Article in Molecular plant pathology, 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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Who cites it
2 citing papers in PubMed.
- The PP2A phosphatase regulatory subunit SsRts1 regulates morphogenesis, mitosis, sexual mating and virulence inVirulence · 2026Article
- Phenylacetate Hydroxylase SsPhacA Modulates p-Coumaric Acid Accumulation to Regulate the Mating/Filamentation of Sporisorium scitamineum.Molecular plant pathology · 2025Article
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7 authors.
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Abstract
Sugarcane smut, caused by Sporisorium scitamineum, is one of the most severe sugarcane diseases. A key pathogenic step is dikaryotic mycelium formation via sexual reproduction, but its regulatory mechanism is unclear. In this study, we identified a phenylacetate hydroxylase gene, SsPHACA, that is highly expressed during the sexual mating/filamentation of S. scitamineum and enriched within the phenylalanine metabolic pathway. SsPHACA deletion mutants presented significantly reduced sexual mating/filamentation and pathogenicity. Additionally, deletion of SsPHACA resulted in marked downregulation of the pheromone-responsive transcription factor gene SsPRF1, a critical regulator of sexual mating/filamentation in S. scitamineum, as well as its downstream genes at the a- and b-locus genes. Constitutive expression of SsPRF1 restored the sexual mating/filamentation of the SsPHACA deletion mutant. Metabolomic analyses revealed that SsPhacA mediates phenylalanine metabolism in S. scitamineum and modulates the accumulation of p-coumaric acid, an intermediate in phenylalanine metabolism. Exogenous supplementation with p-coumaric acid increased the transcriptional level of SsPRF1 and partially restored sexual mating/filamentation in SsPHACA deletion mutants. In summary, our results demonstrate that SsPhacA mediates the phenylalanine metabolic pathway to modulate p-coumaric acid accumulation, which increases the transcriptional level of SsPRF1, thereby regulating sexual reproduction in S. scitamineum. These findings not only identify a new regulatory factor involved in the sexual mating/filamentation of S. scitamineum, but also provide a new theoretical foundation for the development of disease control strategies targeting metabolic pathways.
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