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Int. J. Mol. Sci. 2013, 14(4), 8328-8344; doi:10.3390/ijms14048328
Article

Two Common Bean Genotypes with Contrasting Response to Phosphorus Deficiency Show Variations in the microRNA 399-Mediated PvPHO2 Regulation within the PvPHR1 Signaling Pathway

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Received: 20 February 2013; in revised form: 2 April 2013 / Accepted: 2 April 2013 / Published: 16 April 2013
(This article belongs to the Special Issue Abiotic and Biotic Stress Tolerance Mechanisms in Plants)
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Abstract: Crop production of the important legume, the common bean (Phaseolus vulgaris), is often limited by low phosphorus (P) in the soil. The genotypes, BAT477 and DOR364, of the common bean have contrasting responses to P starvation. Plants from the BAT477 P deficiency tolerant genotype showed higher phosphate content and root biomass as compared to the DOR364 plants under P starvation. The PvPHR1 transcription factor-signaling pathway plays an essential role in the response to P starvation. PvPHO2, a negative regulator of this pathway, encodes an ubiquitin E2 conjugase that promotes degradation of P-responsive proteins and is the target gene of PvmiR399. PvPHO2 is downregulated in BAT477 plants under P deficiency, while such a response is not observed in P-starved DOR364 plants. Five putative PvmiR399 binding sites were identified in the 5' UTR region in both genotypes. While four sites showed an identical DNA sequence, the fifth (binding site of PvPHO2 one) showed three base changes and higher complementarity scores in DOR364 as compared to BAT477. Modified 5'RACE experiments indicated that PvmiR399 binding and/or processing was affected in DOR364 P-starved plants. We propose that a less efficient cleavage of the PvPHO2 mRNA directed by PvmiR399 would result in a higher PvPHO2-mediated degradation of P-responsive proteins in the DOR364 genotype with decreased P deficiency tolerance.
Keywords: Phaseolus vulgaris; common bean; phosphorus deficiency; post-transcriptional regulation by microRNAs; PvPHR1/PvmiR399 signaling pathway Phaseolus vulgaris; common bean; phosphorus deficiency; post-transcriptional regulation by microRNAs; PvPHR1/PvmiR399 signaling pathway
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.

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MDPI and ACS Style

Ramírez, M.; Flores-Pacheco, G.; Reyes, J.L.; Luz Alvarez, A.; Drevon, J.J.; Girard, L.; Hernández, G. Two Common Bean Genotypes with Contrasting Response to Phosphorus Deficiency Show Variations in the microRNA 399-Mediated PvPHO2 Regulation within the PvPHR1 Signaling Pathway. Int. J. Mol. Sci. 2013, 14, 8328-8344.

AMA Style

Ramírez M, Flores-Pacheco G, Reyes JL, Luz Alvarez A, Drevon JJ, Girard L, Hernández G. Two Common Bean Genotypes with Contrasting Response to Phosphorus Deficiency Show Variations in the microRNA 399-Mediated PvPHO2 Regulation within the PvPHR1 Signaling Pathway. International Journal of Molecular Sciences. 2013; 14(4):8328-8344.

Chicago/Turabian Style

Ramírez, Mario; Flores-Pacheco, Gerardo; Reyes, José L.; Luz Alvarez, Ana; Drevon, Jean J.; Girard, Lourdes; Hernández, Georgina. 2013. "Two Common Bean Genotypes with Contrasting Response to Phosphorus Deficiency Show Variations in the microRNA 399-Mediated PvPHO2 Regulation within the PvPHR1 Signaling Pathway." Int. J. Mol. Sci. 14, no. 4: 8328-8344.



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