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The bean polygalacturonase-inhibiting protein 2 (PvPGIP2) is highly conserved in common bean (Phaseolus vulgaris L.) germplasm and related species

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Abstract

Polygalacturonase-inhibiting proteins (PGIPs) are extracellular plant protein inhibitors of endo-polygalacturonases (PGs) that belong to the leucine-rich repeat (LRR) protein family. In bean, PGIP is encoded by a small gene family of four members among which Pvpgip2 encodes the most wide-spectrum and efficient inhibitor of fungal PGs. In order to evaluate the sequence polymorphism of Pvpgip2 and its functional significance, we have analyzed a number of wild and cultivated bean (P. vulgaris) accessions of Andean and Mesoamerican origin, and some genotypes from the related species P. coccineus, P. acutifolius, and P. lunatus. Our analyses indicate that the protein encoded by Pvpgip2 is highly conserved in the bean germplasm. The few detected polymorphic sites correspond to synonymous substitutions and only two wild genotypes contain a Pvpgip2 with a single non-synonymous replacement. Sequence comparison showed a slightly larger variation in the related bean species P. coccineus, P. acutifolius, and P. lunatus and confirmed the known phylogenetic relationships with P. vulgaris. The majority of the replacements were within the xxLxLxx region of the leucine rich repeat (LRR) domain and none of them affected residues contributing to structural features. The variant PGIPs were expressed in Nicotiana benthamiana using PVX as vector and their inhibitory activity compared to that of PvPPGIP2. All the variants were able to fully inhibit the four fungal PGs tested with minor differences. Taken together these results support the hypothesis that the overall sequence conservation of PGIP2 and minor variation at specific sites is necessary for high-affinity recognition of different fungal PGs.

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Acknowledgments

Research supported by Ministero delle politiche agricole alimentari e forestali (MIPAF), Italy grant “Proteo-Stress”.

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Authors and Affiliations

  1. Dipartimento di Agrobiologia e Agrochimica, Università della Tuscia, 01100, Viterbo, Italy

    Anna Farina, Valentina Rocchi, Michela Janni & Renato D’Ovidio

  2. Dipartimento Scienze Agronomiche e Gestione del Territorio, Università di Firenze, 50144, Florence, Italy

    Stefano Benedettelli

  3. Dipartimento di Biologia Vegetale, Università di Roma ‘La Sapienza’, 00185, Rome, Italy

    Giulia De Lorenzo

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  1. Anna Farina
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  2. Valentina Rocchi
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  5. Giulia De Lorenzo
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  6. Renato D’Ovidio
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Correspondence to Renato D’Ovidio.

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Communicated by D. Lightfoot.

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Farina, A., Rocchi, V., Janni, M. et al. The bean polygalacturonase-inhibiting protein 2 (PvPGIP2) is highly conserved in common bean (Phaseolus vulgaris L.) germplasm and related species. Theor Appl Genet 118, 1371–1379 (2009). https://doi.org/10.1007/s00122-009-0987-4

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