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Relationship between the genetic characteristics of[i] Botrytis[/i] sp. airborne inoculum and meteorological parameters, seasons and the origin of air masses

Abstract : Grey mould is a worldwide disease on many economically important crops. It is caused by two fungal species, [i]Botrytis cinerea[/i] and[i] B. pseudocinerea[/i], which are mainly airborne dispersed. Although several studies have considered the abundance of airborne inoculum of [i]B. cinerea[/i] in models forecasting the risk of grey mould epidemics, the genetic characteristics of this inoculum are poorly known. In the present study, airborne inoculum of [i]B. cinerea[/i] and [i]B. pseudocinerea[/i] was collected on 29 dates over a 2.5-year period on a site in south-eastern France. The 683 sampled isolates were genotyped with nine microsatellites markers, and 616 were identified as [i]B. cinerea[/i]. The genetic structure of[i] B. cinerea[/i] airborne inoculum was inferred with Bayesian assignment tests. Eight genetic clusters were identified. Cluster abundance showed temporal variation and was statistically linked to the season (P = 0.0009) and the origin of air masses (P < 0.0001). The proportion of isolates belonging to the species[i] B. pseudocinerea[/i] was equal to 9.8 % on average, but it showed temporal variation; it tended to be higher in winter. This study is the first to provide information about the genetic characteristics of airborne inoculum of[i] B. cinerea[/i] and [i]B. pseudocinerea[/i] and to bring evidence of relationship with seasons, meteorological parameters and with the origin of air masses.
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Submitted on : Thursday, February 4, 2016 - 11:51:27 PM
Last modification on : Wednesday, September 8, 2021 - 4:02:07 PM

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Christel Leyronas, Fabien Halkett, Philippe C. Nicot. Relationship between the genetic characteristics of[i] Botrytis[/i] sp. airborne inoculum and meteorological parameters, seasons and the origin of air masses. Aerobiologia, Springer Verlag, 2015, 31 (3), pp.367-380. ⟨10.1007/s10453-015-9370-x⟩. ⟨hal-01268891⟩

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