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The Common Bean (Phaseolus vulgaris) Basic Leucine Zipper (bZIP) Transcription Factor Family: Response to Salinity Stress in Fertilized and Symbiotic N2-Fixing Plants

1
Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México, Cuernavaca 62209, Morelos, Mexico
2
Laboratorio de Fisiología Vegetal, Facultad de Biología, Universidad de La Habana, La Habana 10400, Cuba
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Agriculture 2018, 8(10), 160; https://doi.org/10.3390/agriculture8100160
Received: 10 August 2018 / Revised: 19 September 2018 / Accepted: 3 October 2018 / Published: 11 October 2018
(This article belongs to the Special Issue Legume-rhizobia Symbiosis: Current Knowledge and Future Prospects)
The basic leucine zipper (bZIP) transcription factor family regulates plant developmental processes and response to stresses. The common bean (Phaseolus vulgaris), an important crop legume, possesses a whole set of 78 bZIP (PvbZIP) genes, the majority of these (59%) are most highly expressed in roots and nodules, root-derived new organs formed in the rhizobia N2-fixing symbiosis. Crop production is highly affected by salinity in Cuba and other countries. In this work we characterized the adverse effect of salinity to common bean plants of the Cuban CC-25-9-N cultivar grown in fertilized (full N-content) or symbiotic N-fixation (rhizobia inoculated) conditions. We assessed if PvbZIP TF participate in CC-25-9-N common bean response to salinity. Quantitative reverse-transcriptase-PCR (qRT-PCR) expression analysis showed that 26 out of 46 root/nodule-enhanced PvbZIP, that responded to salt stress in roots and/or nodules from fertilized and N2-fixing CC-25-9-N plants. From public common bean transcriptomic data, we identified 554 genes with an expression pattern similar to that of salt-responsive PvbZIP genes, and propose that the co-expressed genes are likely to be involved in the stress response. Our data provide a foundation for evaluating the individual roles of salt-responsive genes and to explore the PvbZIP-mediated improvement of salt tolerance in common bean. View Full-Text
Keywords: bZIP transcription factors; common bean; salinity stress; legume-rhizobia symbiosis bZIP transcription factors; common bean; salinity stress; legume-rhizobia symbiosis
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Ayra, L.; Ramírez, M.; Íñiguez, L.P.; Rodés, R.; Ortega, E.; Hernández, G. The Common Bean (Phaseolus vulgaris) Basic Leucine Zipper (bZIP) Transcription Factor Family: Response to Salinity Stress in Fertilized and Symbiotic N2-Fixing Plants. Agriculture 2018, 8, 160.

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