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Title: MicroRNAs Suppress NB Domain Genes in Tomato That Confer Resistance to Fusarium oxysporum

Journal Article · · PLoS Pathogens
 [1];  [1];  [1];  [2];  [1];  [1];  [1]
  1. Univ. of California, Riverside, CA (United States). Inst. for Integrative Genome Biology
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Bioscience Division

MicroRNAs (miRNAs) suppress the transcriptional and post-transcriptional expression of genes in plants. Several miRNA families target genes encoding nucleotide-binding site–leucine-rich repeat (NB-LRR) plant innate immune receptors. The fungus Fusarium oxysporum f. sp. lycopersici causes vascular wilt disease in tomato. Here, we explored a role for miRNAs in tomato defense against F. oxysporum using comparative miRNA profiling of susceptible (Moneymaker) and resistant (Motelle) tomato cultivars. slmiR482f and slmiR5300 were repressed during infection of Motelle with F. oxysporum. Two predicted mRNA targets each of slmiR482f and slmiR5300 exhibited increased expression in Motelle and the ability of these four targets to be regulated by the miRNAs was confirmed by co-expression in Nicotiana benthamiana. Silencing of the targets in the resistant Motelle cultivar revealed a role in fungal resistance for all four genes. All four targets encode proteins with full or partial nucleotide-binding (NB) domains. One slmiR5300 target corresponds to tm-2, a susceptible allele of the Tomato Mosaic Virus resistance gene, supporting functions in immunity to a fungal pathogen. The observation that none of the targets correspond to I-2, the only known resistance (R) gene for F. oxysporum in tomato, supports roles for additional R genes in the immune response. In conclusion, taken together, our findings suggest that Moneymaker is highly susceptible because its potential resistance is insufficiently expressed due to the action of miRNAs.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
OSTI ID:
1263545
Journal Information:
PLoS Pathogens, Vol. 10, Issue 10; ISSN 1553-7374
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 118 works
Citation information provided by
Web of Science

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  • D., Kasschau, Kristin; L., Dangl, Jeffery; M., Sullivan, Christopher
  • The University of North Carolina at Chapel Hill University Libraries https://doi.org/10.17615/076p-2x42
text January 2007
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Host-Pathogen interactions modulated by small RNAs journal June 2017
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The Diversification of Plant NBS-LRR Defense Genes Directs the Evolution of MicroRNAs That Target Them journal August 2016
The SNARE protein FolVam7 mediates intracellular trafficking to regulate conidiogenesis and pathogenicity in Fusarium oxysporum f. sp. lycopersici journal March 2019
Down-regulation of genes coding for core RNAi components and disease resistance proteins via corresponding microRNAs might be correlated with successful Soybean mosaic virus infection in soybean: Involvement of miRNAs in soybean-SMV interaction journal September 2017
The immune repressor BIR1 contributes to antiviral defense and undergoes transcriptional and post‐transcriptional regulation during viral infections journal June 2019
Genome-wide identification of soybean microRNA responsive to soybean cyst nematodes infection by deep sequencing journal August 2017
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Comparative Transcriptome Profiles of Near-Isogenic Hexaploid Wheat Lines Differing for Effective Alleles at the 2DL FHB Resistance QTL journal January 2018
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