Fungi fruiting hypogeously are believed to form spore banks in soil especially because some fruitbodies are not removed by animals. However, little is known on the proportion of fruitbodies that are not removed by animals. We took advantage of the brûlé phenomenon, which allows delineation of the mycelium distribution, to assess the proportion of unremoved black truffle (Tuber melanosporum) fruitbodies in the context of plantations where fruitbodies are actively sought and harvested by truffle growers. We inspected portions of the brûlés after the harvest season to find unremoved fruitbodies. On average, from six truffle grounds in which a total of 38 brûlés were investigated, unremoved fruitbodies represented 33% of the whole fruitbody production (42% when averaging all the brûlés). We discuss this value and its high variability among truffle grounds. Beyond the local and variable accidental reasons that may lead to this high proportion, we speculate that the formation of some undetectable fruitbodies may be under selection pressure, given the reproductive biology of T. melanosporum.
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We are very grateful to Lucien Bonneau, Francis Caulet, Jean-Paul Laurents, Lucien Romieu, Patrick Savary, and Jean-François Tourette for having carried out the protocol on, or given access to, their truffle ground. We thank Dominique Barry-Etienne and Claude Murat for information on truffle fruitbody decomposition in soil, David Marsh for English corrections, two anonymous referees and Jan Colpaert for insightful comments on earlier versions of this paper, and Lucien Bonneau for providing pictures of the experiment (supplementary figure S1).
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Electronic supplementary material
Search for unremoved T. melanosporum fruitbodies at the end of the harvest season. (a) Delineation of a 30 × 30 cm surface, arbitrarily located. (b) Digging of a well to harvest the unremoved fruitbodies. (c) Five unremoved fruitbodies. Courtesy Lucien Bonneau. Figure S2. Number of unremoved fruitbodies per square meter is not correlated with the number of harvested truffles per square meter. (A) all brûlés (linear regression model, P = 0.17); (B) all truffle grounds (linear regression model, P = 0.46). (PDF 235 kb)
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Schneider-Maunoury, L., Taschen, E., Richard, F. et al. Soil spore bank in Tuber melanosporum: up to 42% of fruitbodies remain unremoved in managed truffle grounds. Mycorrhiza 29, 663–668 (2019). https://doi.org/10.1007/s00572-019-00912-3
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