Journal of Plant Research

, Volume 128, Issue 4, pp 665–678 | Cite as

Endophytic colonization of barley (Hordeum vulgare) roots by the nematophagous fungus Pochonia chlamydosporia reveals plant growth promotion and a general defense and stress transcriptomic response

  • Eduardo Larriba
  • María D. L. A. Jaime
  • Corey Nislow
  • José Martín-Nieto
  • Luis Vicente Lopez-Llorca
Regular Paper


Plant crop yields are negatively conditioned by a large set of biotic and abiotic factors. An alternative to mitigate these adverse effects is the use of fungal biological control agents and endophytes. The egg-parasitic fungus Pochonia chlamydosporia has been traditionally studied because of its potential as a biological control agent of plant-parasitic nematodes. This fungus can also act as an endophyte in monocot and dicot plants, and has been shown to promote plant growth in different agronomic crops. An Affymetrix 22K Barley GeneChip was used in this work to analyze the barley root transcriptomic response to P. chlamydosporia root colonization. Functional gene ontology (GO) and gene set enrichment analyses showed that genes involved in stress response were enriched in the barley transcriptome under endophytism. An 87.5 % of the probesets identified within the abiotic stress response group encoded heat shock proteins. Additionally, we found in our transcriptomic analysis an up-regulation of genes implicated in the biosynthesis of plant hormones, such as auxin, ethylene and jasmonic acid. Along with these, we detected induction of brassinosteroid insensitive 1-associated receptor kinase 1 (BR1) and other genes related to effector-triggered immunity (ETI) and pattern-triggered immunity (PTI). Our study supports at the molecular level the growth-promoting effect observed in plants endophytically colonized by P. chlamydosporia, which opens the door to further studies addressing the capacity of this fungus to mitigate the negative effects of biotic and abiotic factors on plant crops.


Effector-triggered immunity Endophytism Hordeum vulgare Plant growth Pochonia chlamydosporia Root transcriptomics 



This research was funded by the Spanish Ministry of Science and Innovation Grant AGL2011-29297. We thank Natalia Navarro Román and Juan Carlos García Villena (University of Alicante) for help with the artwork and for custom script design, respectively.

Supplementary material

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Copyright information

© The Botanical Society of Japan and Springer Japan 2015

Authors and Affiliations

  • Eduardo Larriba
    • 1
    • 2
  • María D. L. A. Jaime
    • 3
    • 4
  • Corey Nislow
    • 5
    • 6
    • 7
  • José Martín-Nieto
    • 2
    • 8
  • Luis Vicente Lopez-Llorca
    • 1
    • 2
  1. 1.Department of Marine Sciences and Applied BiologyUniversity of AlicanteAlicanteSpain
  2. 2.Multidisciplinary Institute for Environmental Studies ‘Ramón Margalef’University of AlicanteAlicanteSpain
  3. 3.Department of Cell and Systems BiologyUniversity of TorontoMississaugaCanada
  4. 4.National Institutes of Diabetes and Digestive and Kidney Diseases, National Institutes of HealthBethesdaUSA
  5. 5.Department of Molecular GeneticsUniversity of TorontoTorontoCanada
  6. 6.Banting and Best Department of Medical ResearchUniversity of TorontoTorontoCanada
  7. 7.Department of Pharmaceutical SciencesUniversity of British ColumbiaVancouverCanada
  8. 8.Department of Physiology, Genetics and MicrobiologyUniversity of AlicanteAlicanteSpain

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