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Title: Populus trichocarpa encodes small, effector-like secreted proteins that are highly induced during mutualistic symbiosis

Journal Article · · Scientific Reports
 [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [2];  [2];  [2]; ORCiD logo [2];  [3];  [3];  [3];  [2];  [4];  [5]; ORCiD logo [2]; ORCiD logo [4];  [2]; ORCiD logo [2]
  1. UMR 1136 INRA-Univ. of Lorraine, Champenoux (France); Univ. of Western Sydney, Richmond, NSW (Australia)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States)
  4. UMR 1136 INRA-Univ. of Lorraine, Champenoux (France)
  5. Univ. of Western Sydney, Richmond, NSW (Australia)

During symbiosis, organisms use a range of metabolic and protein-based signals to communicate. Of these protein signals, one class is defined as ‘effectors’, i.e., small secreted proteins (SSPs) that cause phenotypical and physiological changes in another organism. To date, protein-based effectors have been described in aphids, nematodes, fungi and bacteria. Using RNA sequencing of Populus trichocarpa roots in mutualistic symbiosis with the ectomycorrhizal fungus Laccaria bicolor, we sought to determine if host plants also contain genes encoding effector-like proteins. We identified 417 plant-encoded putative SSPs that were significantly regulated during this interaction, including 161 SSPs specific to P. trichocarpa and 15 SSPs exhibiting expansion in Populus and closely related lineages. We demonstrate that a subset of these SSPs can enter L. bicolor hyphae, localize to the nucleus and affect hyphal growth and morphology. Finally, we conclude that plants encode proteins that appear to function as effector proteins that may regulate symbiotic associations.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); Australian Research Council
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1351762
Journal Information:
Scientific Reports, Vol. 7, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Cited By (4)

Plant–Microbe Symbiosis: What Has Proteomics Taught Us? journal August 2019
Role of antimicrobial peptides in controlling symbiotic bacterial populations journal January 2018
Root renovation: how an improved understanding of basic root biology could inform the development of elite crops that foster sustainable soil health journal January 2019
Nodule‐specific PLAT domain proteins are expanded in the Medicago lineage and required for nodulation journal February 2019