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7 páginas, 4 figuras, 29 referencias.The Etruscan civilisation originated in the Villanovan Iron Age in the ninth century BC and was absorbed by Rome in the first century BC. Etruscan tombs, many of which are subterranean, are one of the best representations of this culture. The principal importance of these tombs, however, lies in the wall paintings and in the tradition of rich burial, which was unique in the Mediterranean Basin, with the exception of Egypt. Relatively little information is available concerning the biodeterioration of Etruscan tombs, which is caused by a colonisation that covers the paintings with white, circular to irregular aggregates of bacteria or biofilms that tend to connect each other. Thus, these colonisations sometimes cover extensive surfaces. Here we show that the colonisation of paintings in Tomba del Colle is primarily due to bacteria of the order Rhizobiales (Alphaproteobacteria), which were likely influenced by the neighbouring rhizosphere community and the availability of nutrients from root exudates.This work was funded through the projects CGL2010-17183, 201030E011 and Consolider\ud2007-00058. M.D.H. was supported by a JAE Research Fellowship from CSIC, and S.C. was\udsupported by a Juan de la Cierva contract.Peer reviewe

Deterioration of an Etruscan tomb by bacteria from the order Rhizobiales