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Int. J. Mol. Sci. 2016, 17(5), 755; doi:10.3390/ijms17050755

Bacterial Molecular Signals in the Sinorhizobium fredii-Soybean Symbiosis

1
Departamento de Microbiología, Facultad de Biología, Universidad de Sevilla, Avenida de Reina Mercedes, 6, 41012 Sevilla, Spain
2
Departamento de Química Orgánica, Facultad de Química, Universidad de Sevilla, Profesor García González, 1, 41012 Sevilla, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Peter M. Gresshoff and Brett Ferguson
Received: 23 March 2016 / Revised: 4 May 2016 / Accepted: 5 May 2016 / Published: 18 May 2016
(This article belongs to the Special Issue Molecular Signals in Nodulation Control)
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Abstract

Sinorhizobium (Ensifer) fredii (S. fredii) is a rhizobial species exhibiting a remarkably broad nodulation host-range. Thus, S. fredii is able to effectively nodulate dozens of different legumes, including plants forming determinate nodules, such as the important crops soybean and cowpea, and plants forming indeterminate nodules, such as Glycyrrhiza uralensis and pigeon-pea. This capacity of adaptation to different symbioses makes the study of the molecular signals produced by S. fredii strains of increasing interest since it allows the analysis of their symbiotic role in different types of nodule. In this review, we analyze in depth different S. fredii molecules that act as signals in symbiosis, including nodulation factors, different surface polysaccharides (exopolysaccharides, lipopolysaccharides, cyclic glucans, and K-antigen capsular polysaccharides), and effectors delivered to the interior of the host cells through a symbiotic type 3 secretion system. View Full-Text
Keywords: soybean; Sinorhizobium fredii; Bradyrhizobium; Nod factors; type 3 secretion system; effector; exopolysaccharide; lipopolysaccharide; cyclic glucans; K-antigen polysaccharide soybean; Sinorhizobium fredii; Bradyrhizobium; Nod factors; type 3 secretion system; effector; exopolysaccharide; lipopolysaccharide; cyclic glucans; K-antigen polysaccharide
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

López-Baena, F.J.; Ruiz-Sainz, J.E.; Rodríguez-Carvajal, M.A.; Vinardell, J.M. Bacterial Molecular Signals in the Sinorhizobium fredii-Soybean Symbiosis. Int. J. Mol. Sci. 2016, 17, 755.

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