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geosmin, a sesquiterpenoid metabolite produced by soil living fungi. Some food commodities are liable to contamination by geosmin producing fungi. Under favourable environmental conditions the production of geosmin occurs. One of the producers of geosmin in fruits is Penicillium expansum which also produces the mycotoxin patulin. Recent reports indicate that geosmin production by P. expansum is stimulated by Botrytis cinerea.
Example of Gravitropism in the remains of a cellar of a Roman villa in the Archeologic Park in Baia, Italy. Geotropism (also known as gravitropism) is a turning or growth movement by a plant or fungus in response to gravity. It is a general feature of all higher and many lower plants as well as other organisms.bundant evidence demonstrates that roots bend in response to gravity due to a regulated movement of the plant hormone auxin known as polar auxin transport (Swarup et al., 2005). This was described in the 1920s in the Cholodny-Went model.