Regulation of Small RNAs and Corresponding Targets in Nod Factor-Induced Phaseolus vulgaris Root Hair CellsReport as inadecuate

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Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México UNAM, Avenida Universidad 1001, Cuernavaca 62210, Morelos, Mexico


Departamento de Biología Molecular de Plantas, Instituto de Biotecnología UNAM, Avenida Universidad 2001, Cuernavaca 62210, Morelos, Mexico


Author to whom correspondence should be addressed.

Academic Editors: Peter M. Gresshoff and Brett Ferguson

Abstract A genome-wide analysis identified the set of small RNAs sRNAs from the agronomical important legume Phaseolus vulgaris common bean, including novel P. vulgaris-specific microRNAs miRNAs potentially important for the regulation of the rhizobia-symbiotic process. Generally, novel miRNAs are difficult to identify and study because they are very lowly expressed in a tissue- or cell-specific manner. In this work, we aimed to analyze sRNAs from common bean root hairs RH, a single-cell model, induced with pure Rhizobium etli nodulation factors NF, a unique type of signal molecule. The sequence analysis of samples from NF-induced and control libraries led to the identity of 132 mature miRNAs, including 63 novel miRNAs and 1984 phasiRNAs. From these, six miRNAs were significantly differentially expressed during NF induction, including one novel miRNA: miR-RH82. A parallel degradome analysis of the same samples revealed 29 targets potentially cleaved by novel miRNAs specifically in NF-induced RH samples; however, these novel miRNAs were not differentially accumulated in this tissue. This study reveals Phaseolus vulgaris-specific novel miRNA candidates and their corresponding targets that meet all criteria to be involved in the regulation of the early nodulation events, thus setting the basis for exploring miRNA-mediated improvement of the common bean–rhizobia symbiosis. View Full-Text

Keywords: common bean; legume-rhizobia interaction; miRNAs; phasiRNAs common bean; legume-rhizobia interaction; miRNAs; phasiRNAs

Author: Damien Formey 1, José Ángel Martín-Rodríguez 1, Alfonso Leija 1, Olivia Santana 2, Carmen Quinto 2, Luis Cárdenas 2 and Georgina Hernández 1,*



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