Characterization of aggregates produced by the potential mycoherbistat Plectosporium alismatis in submerged culture: germination, UV-radiation tolerance and infectivity

Abstract : Plectosporium alismatis, a potential mycoherbistat of Alismatacae spp., has been previously shown to produce aggregates which contain chlamydospores in liquid culture. Weevaluated the impact of medium composition on the formation and composition of aggregates. In shake flasks cultures using 5.74 gL(-1) sodium nitrate, 8.8 gL(-1) malt extract or glucose and 0.1% Tween 80, P. alismatis formed small, uniform (diameter of 75% aggregates <720 mu m), dense, melanised aggregates containing 10(4) conidia and 10(3) chlamydospores, these numbers remained unchanged during growth. All 7-day-old aggregates exposed to desiccation or/and UV-radiation germinated. In bioassays using leaf discs of Alisma plantago-aquatica, P. alismatis aggregates caused necrosis, regardless of whether aggregates had been exposed to desiccation and/or UV-radiation prior to application on leaf discs, whereas other propagules (10(3) propagules disc(-1)) exposed to drying and UV-radiation stress were unable to cause necrosis. This preliminary research shows the potential of aggregates to be used as part of a formulation of biocontrol agents, provided adequate conditions for optimal aggregate yields are found.
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Article dans une revue
Biocontrol Science and Technology, Taylor & Francis, 2011, 21 (10), pp.1243-1256. 〈10.1080/09583157.2011.604124〉
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http://hal.univ-brest.fr/hal-00675574
Contributeur : Catherine Bertignac <>
Soumis le : jeudi 1 mars 2012 - 14:43:01
Dernière modification le : jeudi 13 septembre 2018 - 14:56:02

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Sophie Cliquet, Julien Despreaux, Kashif Zeeshan, Denis De La Broise, Gavin Ash. Characterization of aggregates produced by the potential mycoherbistat Plectosporium alismatis in submerged culture: germination, UV-radiation tolerance and infectivity. Biocontrol Science and Technology, Taylor & Francis, 2011, 21 (10), pp.1243-1256. 〈10.1080/09583157.2011.604124〉. 〈hal-00675574〉

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