Bacteria passed between generations benefits you more than others

Symbiosis considered include light-producing bacteria that helps the squid defend against predators. Credit: C. Frazee, and contributed by M. McFall-Ngai

Bacteria passed straight to children have more healthcare benefits than if they are transmitted via the surrounding environment, new Oxford University research reveals.


Many insects and carry beneficial , which provide a variety of services. Some provide nutrients, such as those living in aphids, the green and which plague garden . Others help their animal hosts defend against parasites. However, while animals would die without some bacteria, they would hardly notice the absence of others. Why do we get this variation?

New research, published in Nature Communications, researchers from the University of Oxford, Department of Zoology, tracked the evolutionary history of 106 bacterial symbioses, in a range of animal plant and fungi species.

The findings have revealed that how bacteria is passed and contracted is key to the intensity of symbiont relationships. When bacteria are passed vertically, straight from mother to offspring, they tend to be much better for their hosts than if they are transmitted via the environment (horizontally).

The team found that when bacteria are passed on vertically, hosts evolve to depend on them. Removing these bacteria can have a significant negative impact on the host. In the case of Aphids, also known as plant lice, individuals die if you take away their bacteria. In contrast, bacteria that are passed via the environment, has a smaller impact. Plants such as peas and beans acquire Rhizobia bacteria from the soil, which can extract nitrogen from the air and put it into a form that the plant can use. Rhizobia plays an important role in plant rotations, but…

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