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- W2141555372 abstract "Summary Disease symptoms of some phytopathogenic fungi are associated with changes in cytokinin ( CK ) levels. Here, we show that the CK profile of ergot‐infected rye plants is also altered, although no pronounced changes occur in the expression of the host plant's CK biosynthesis genes. Instead, we demonstrate a clearly different mechanism: we report on the first fungal de novo CK biosynthesis genes, prove their functions and constitute a biosynthetic pathway. The ergot fungus C laviceps purpurea produces substantial quantities of CK s in culture and, like plants, expresses enzymes containing the isopentenyltransferase and lonely guy domains necessary for de novo isopentenyladenine production. Uniquely, two of these domains are combined in one bifunctional enzyme, CpIPT ‐ LOG , depicting a novel and potent mechanism for CK production. The fungus also forms trans ‐zeatin, a reaction catalysed by a CK ‐specific cytochrome P 450 monooxygenase, which is encoded by cpp450 forming a small cluster with cpipt‐log . Deletion of cpipt‐log and cpp450 did not affect virulence of the fungus, but Δcpp450 mutants exhibit a hyper‐sporulating phenotype, implying that CK s are environmental factors influencing fungal development." @default.
- W2141555372 created "2016-06-24" @default.
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- W2141555372 date "2015-04-15" @default.
- W2141555372 modified "2023-10-18" @default.
- W2141555372 title "<i>De novo</i> biosynthesis of cytokinins in the biotrophic fungus <scp><i>C</i></scp><i>laviceps purpurea</i>" @default.
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- W2141555372 doi "https://doi.org/10.1111/1462-2920.12838" @default.
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