Germling fusion via conidial anastomosis tubes in the grey mould Botrytis cinerea requires NADPH oxidase activity |
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Authors: | Roca M Gabriela Weichert Martin Siegmund Ulrike Tudzynski Paul Fleissner André |
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Institution: | 1. Institut für Genetik, Technische Universität Braunschweig, Spielmannstraße 7, 38106 Braunschweig, Germany;2. Institut für Biologie und Biotechnologie der Pflanzen, Westfälische Wilhelms-Universität Münster, Hindenburgplatz 55, 48143 Münster, Germany |
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Abstract: | In many filamentous ascomycete species, the early steps of colony development include fusion between germinating vegetative spores (conidial germlings). Often these fusion events are mediated by specialized hyphal structures, so-called conidial anastomosis tubes (CATs). Here, we show that germling fusion in the grey mould Botrytis cinerea is mediated by hyphal structures possessing the typical features of CATs. Formation of these structures is delayed when spores are germinating on complex media compared to growth on poor substrates. Fusion frequency is also influenced by the growth conditions of the precultures from which spores were obtained. During germination on hydrophobic plant surfaces, which induce pathogenic development, CAT formation is significantly suppressed. Screening of existing B. cinerea gene knockout mutants identified strains lacking the NADPH oxidase BcNoxA or the potential Nox regulator BcNoxR as fusion deficient, suggesting a potential role of reactive oxygen species (ROS) signalling in CAT formation and fusion. |
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Keywords: | Anastomosis Botrytis Conidial anastomosis tube Germination NADPH oxidase Pathogenicity |
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