Quorum sensing and other communication strategies in A. brasilense.

J. GUALPA; S. NIEVAS; G. LOPEZ; N. HALLIDAY; M. CAMARA; F. CASSAN

Foz do Iguaçu

Congreso; XVI Symposium on Biological Nitrogen Fixation with Non-Legumes, IV Latin-American workshop on PGPR and XIX RELARE; 2018

Embrapa

The community of microbes associated with plant surfaces and tissues (plant microbiome) is currently in the focus of plant biotechnology. Usuallythis bacteria use small molecules for cell-to-cell communication. The mechanism known as quorum sensing (QS) based on N-acyl-L-homoserine lactones (AHL) allows cell-to-cell communication to control the expression of certain genes at high cell density. QS systems are found in Gram-negative bacteria and to control various phenotypes that are often essential for interaction with a eukaryotic host, notably for plant-associated bacteria. On the other hand, quorum quenching (QQ) refers to all processes involved in the interruption of QS, QQ is a natural microbial mechanism, either to degrade their own QS signals, or to establish competitive relationships with other microorganisms. In Argentina, A. brasilensestrains Az39 have been exponentially used in commercial inoculants for grain crops including maize (Zea mays L.), wheat (Triticum aestivum L.) and also for other legumes species, such as soybean [Glycine max L. (Merr.)]. Despite the agronomic importance of A. brasilense strain Az39, few studies have been performed on QS in that genus and mainly with this important strain.