It turns out that the causative substance of “ rain smell '' is used to change the behavior of creatures living in the forest
When it rains, you may feel a unique smell like wet soil,Petrichor". It is also known that the chemical substance that is the main component of the rain odor is released by microorganisms, but that this chemical substance "changes the behavior of creatures living in forests and is used for propagation of microorganisms" Newly found out.
Developmentally regulated volatiles geosmin and 2-methylisoborneol attract a soil arthropod to Streptomyces bacteria promoting spore dispersal | Nature Microbiology
Love The Smell of Rain? There's an Ulterior Motive Behind The Lure of Petrichor
The smell of rain is composed of multiple chemicals,ozoneIt is said that the smell is mixed, but the main component is "GeosminIs a volatile organic compound. This geosmin is a kind of eubacteriaStreptomycesIt is said that it is released when he dies.
However, it was not known why Streptomyces released organic compounds such as geosmin when they died, and the role that organic compounds released by microorganisms play in the forest soil environment. An international research team consisting of Swedish and British researchers,2-methylisoborneolAnd other compounds inhabit the forest soilCollembolaIt is said that he conducted an experiment to examine the effect on the environment. Collembola is a very common arthropod that has been identified in over 3000 species worldwide, and 360 species have been reported in Japan.
A trap was set up in the forest to check the number of snapbills caught, and in the lab, the reaction to chemicals was found.Streptomyces coelicolorIt was found that it was possible to detect geosmin and 2-methylisoborneol by touch. Collembola is a "big fan" of geosmin and 2-methylisoborneol, and prefers to eat microorganisms that release these chemicals.
The research team believes that Streptomyces emits odorants to increase the likelihood that they will be eaten by colander, to "extend their habitat." Streptomyces sp.Filamentous fungusSimilarly, when ready to reproduce, it has the property of producing spores and spreading new bacteria. Since the bacterium Streptomyces can not move around long distances by itself, it is necessary to rely on other creatures to spread spores.
This is where the colleagues feed on Streptomyces. If the stink bug eats Streptomyces or the spores attach to the surface of the body, the spores can move together with the colander, so if the Streptomyces is attracting the colander with chemicals such as geosmin. The research team is explaining.
It is also known that not only the beetles are sensitive to geosmin, but also humans are very sensitive to the smell of geosmin. Even if diluted to 1 billionth, it seems that humans can notice the smell of geosmin, but the reason why humans are sensitive to the smell of geosmin is not known at the time of article creation .