Human skin and gut microbes influence processes from digestion to disease resistance. Despite the fact that tropical forests are the most biodiverse terrestrial ecosystems on the planet, more is known about belly-button bacteria than bacteria on trees in the tropics.
Smithsonian scientists and colleagues working on Panama’s Barro Colorado Island discovered that small leaf samples from a single tree were home to more than 400 different kinds of bacteria. The combined sample from 57 tree species contained more than 7,000 different kinds.
Bacteria in tropical forests may also play a vital role, protecting leaves against pathogens and even affecting the ability of forests to respond to climate change.
“Just as people are realizing that microbes carried by humans can have an influence on a person’s health—positive or negative—we hope to discover what bacteria on tree leaves can tell us about the health of a forest,” said S. Joseph Wright, a Smithsonian scientist and co-author of the new study published in Proceedings of the National Academy of Sciences.
In contrast to a previous study of bacteria on leaves in a temperate forest where different leaves had different bacteria, there was a core group of species of common bacteria present on leaves of nearly all of the species sampled in Panama. Just as on human skin, many of the bacteria on tropical tree leaves were Actinobacteria and Proteobacteria.
The researchers, from the Smithsonian Tropical Research Institute, University of Quebec, University of Arizona, University of Oregon, University of California—Los Angeles and Santa Fe Institute, also looked for relationships between the composition of bacterial communities on leaves and other plant characteristics.
Many bacteria were associated with certain functional traits such as leaf thickness, wood density or leaf nitrogen content, characteristics that directly impact tree growth, survival and reproduction.
The relationships between many of the bacteria and tree species they sampled were ancient, going back to the ancestors of both the bacteria and the trees as they evolved in tandem.
“Our ability to use molecular techniques like 16S ribosomal RNA gene sequencing to characterize nearly all of the bacteria on a leaf is going to make it possible to see how very different members of forest communities interact,” said Wright. The Smithsonian forest ecologist and his colleagues hope to collaborate with researchers at the 60 Forest Global Earth Observatory sites coordinated by the Smithsonian’s Center for Tropical Forest Science to compare interactions at different sites and under different environmental conditions.
The Smithsonian Tropical Research Institute, headquartered in Panama City, Panama, is a unit of the Smithsonian Institution. The Institute furthers the understanding of tropical nature and its importance to human welfare, trains students to conduct research in the tropics and promotes conservation by increasing public awareness of the beauty and importance of tropical ecosystems. Website: www.stri.si.edu.
Kembel, S.W., O’Connor, T.K., Arnold, H.K., Hubbell, S.P., Wright, S.J. and Green, J.L. 2014 Relationships between phyllosphere bacterial communities and plant functional traits in a neotropical forest. Proc. Nat. Acad. Sci. early online edition: www.pnas.org/cgi/doi/10.1073/pnas.1216057111.
STRI News Releases
Beth King | Eurek Alert!
New research recovers nutrients from seafood process water
31.10.2018 | Chalmers University of Technology
Plant Hormone Makes Space Farming a Possibility
17.10.2018 | Universität Zürich
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...
Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.
When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure
Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...
Physicists at ETH Zurich demonstrate how errors that occur during the manipulation of quantum system can be monitored and corrected on the fly
The field of quantum computation has seen tremendous progress in recent years. Bit by bit, quantum devices start to challenge conventional computers, at least...
09.11.2018 | Event News
06.11.2018 | Event News
23.10.2018 | Event News
13.11.2018 | Life Sciences
13.11.2018 | Life Sciences
13.11.2018 | Awards Funding