Abstract
A wide variety of plant–associated soil bacteria (rhizobacteria) communicate with each other by quorum sensing (QS). Plants are able to detect and produce mimics and inhibitor molecules of the QS bacterial communicative process. Arachis hypogaea L. (peanut) establishes a nitrogen-fixing symbiosis with rhizobia belonging to the genus Bradyrhizobium. These bacteria use a QS mechanism dependent on the synthesis of N-acyl homoserine lactones (AHLs). Given the relevance that plant–rhizobacteria interactions have at the ecological level, this work addresses the involvement of peanut in taking part in the QS mechanism. By using biosensor bacterial strains capable of detecting AHLs, a series of standard and original bioassays were performed in order to determine both (i) the production of QS-like molecules in vegetal materials and (ii) the expression of the QS mechanism throughout plant–bacteria interaction. Mimic QS-like molecules (mQS) linked to AHLs with long acyl chains (lac-AHL), and inhibitor QS-like molecules (iQS) linked to AHLs with short acyl chains (sac-AHL) were detected in seed and root exudates. The results revealed that synthesis of specific signaling molecules by the plant (such as mQS and iQS) probably modulates the function and composition of the bacterial community established in its rhizosphere. Novel bioassays of QS detection during peanut–Bradyrhizobium interaction showed an intense production of QS signals in the contact zone between root and bacteria. It is demonstrated that root exudates stimulate the root colonization and synthesis of lac-AHL by Bradyrhizobium strains in the plant rhizosphere, which leads to the early stages of the development of beneficial plant–bacteria interactions.
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Acknowledgements
This work was supported by Grants from Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT) and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) of the República Argentina. FN, WG and PB are career members of CONICET. LV has a fellowship from the CONICET. The authors are grateful to Prof. Mrs. M.D. Broccardo for English editing of the manuscript.
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Nievas, F., Vilchez, L., Giordano, W. et al. Arachis hypogaea L. produces mimic and inhibitory quorum sensing like molecules. Antonie van Leeuwenhoek 110, 891–902 (2017). https://doi.org/10.1007/s10482-017-0862-2
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DOI: https://doi.org/10.1007/s10482-017-0862-2