Abstract
A functional contribution of pathogenesis-related 1 (PR-1) proteins to host defense has been established. However, systematic investigation of the PR-1 gene family in grapevine (Vitis spp.) has not been conducted previously. Through mining genomic databases, we identified 21 PR-1 genes from the Vitis vinifera genome. Polypeptides encoded by putative PR-1 genes had a signal sequence of about 25 residues and a mature protein of 10.9–29 kDa in size. PR-1 mature proteins contained a highly conserved six-cysteine motif and pI values ranging from 4.6 to 9. A major cluster with 14 PR-1 genes was mapped to a 280-kb region on chromosome 3. One particular PR-1 gene within the cluster encoding a basic-type isoform (pI 7.77), herein named VvPR1b1, was isolated from various genotypes of grapevine (Vitis spp.) for functional studies. Sequence analysis of PCR-amplified DNA revealed that all genotypes contained a single VvPR1b1 gene except for a broad-spectrum bacterial and fungal disease resistant Florida bunch grape hybrid, ‘BN5-4’, from which seven different homologues were identified. Duplication of VvPR1b1-related genes encoding acidic-type PR-1 isoforms was also observed among several genotypes. However, transgenic expression analysis of grapevine PR-1 genes under strong constitutive promoters in transgenic tobacco revealed that only the basic-type VvPR1b1 gene duplicated in ‘BN5-4’ was capable of conferring high level resistance to bacterial disease caused by Pseudomonas syringae pv. tabaci.
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This research was supported by the Florida Agricultural Experiment Station and the Florida Department of Agriculture and Consumer Services’ Viticulture Trust Fund.
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Communicated by K. Kamo.
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Li, Z.T., Dhekney, S.A. & Gray, D.J. PR-1 gene family of grapevine: a uniquely duplicated PR-1 gene from a Vitis interspecific hybrid confers high level resistance to bacterial disease in transgenic tobacco. Plant Cell Rep 30, 1–11 (2011). https://doi.org/10.1007/s00299-010-0934-5
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DOI: https://doi.org/10.1007/s00299-010-0934-5