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Desert farming forms bacterial communities that promote drought resistance

Root bacterial communities change under drought, help plants adapt to lack of water

PLOS

When there is little water available for plants to grow, their roots form alliances with soil microbes that can promote plant growth even under water-limiting conditions, according to research published Oct. 31 by Daniele Daffonchio and colleagues from the University of Milan, Italy in the open access journal PLOS ONE.

Symbiotic relationships between plants and soil microbial communities are critical to the health of plants. Though the effects of drought on plants are well-known, little is known about how lack of water affects the bacteria around plant roots.

In this study, the researchers grew pepper plants under conditions of limited water and analyzed the bacterial species around the roots of the plants. They found that drought stress enriched the microbial communities with bacteria capable of increasing plant photosynthesis and biomass production by up to 40% under limited water conditions.

According to Daffonchio, ""Our findings highlight that fully functional plants cannot be considered single organisms anymore, but meta-organisms of the plant and its microbiome, which promotes essential functions like resistance to water stress. The promotion of drought resistance by bacteria can have important applications, for instance, in retaining high yields from plants even in the presence of lower irrigation. "

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Citation: Marasco R, Rolli E, Ettoumi B, Vigani G, Mapelli F, et al. (2012) A Drought Resistance-Promoting Microbiome Is Selected by Root System under Desert Farming. PLOS ONE 7(10): e48479. doi:10.1371/journal.pone.0048479

Financial Disclosure: This work was financially supported by the FIRB project nu RBIN047MBH ''Strategy to improve crop productivity under water stress'' of the Italian Ministry of University and Research, the European Union in the ambit of project BIODESERT (European Community's Seventh Framework Programme CSA-SA REGPOT-2008-2 under grant agreement nu 245746). ER and FM are supported by Universita` degli Studi di Milano, European Social Found and Regione Lombardia (contract ''Dote Ricerca''). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Competing Interest Statement: The authors have declared that no competing interests exist.

PLEASE LINK TO THE SCIENTIFIC ARTICLE IN ONLINE VERSIONS OF YOUR REPORT (URL goes live after the embargo ends): http://dx.plos.org/10.1371/journal.pone.0048479

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