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2024-05-01T21:21:00.0000000Z
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Plant growth-promoting bacteria potentiate antifungal and plant-beneficial responses of Trichoderma atroviride by upregulating its effector functions

PLOS

  • Paulina Guzmán-Guzmán,
  • Eduardo Valencia-Cantero,
  • Gustavo San

Abstract

Trichoderma uses different molecules to establish communication during its interactions with other organisms, such as effector proteins. Effectors modulate plant physiology to colonize plant roots or improve Trichoderma’s mycoparasitic capacity. In the soil, these fungi can establish relationships with plant growth–promoting bacteria (PGPBs), thus affecting their overall benefits on the plant or its fungal prey, and possibly, the role of effector proteins. The aim of this study was to determine the induction of Trichoderma atroviride gene expression coding for effector proteins during the interaction with different PGPBs, Arabidopsis or the phytopathogen Fusarium brachygibbosum, and to determine whether PGPBs potentiates the beneficial effects of Tatroviride. During the interaction with Fbrachygibbosum and PGPBs, the effector coding genes epl1tatrx2 and tacfem1 increased their expression, especially during the consortia with the bacteria. During the interaction of Tatroviride with the plant and PGPBs, the expression of epl1 and tatrx2 increased, mainly with the consortium formed with Pseudomonas fluorescens UM270, Bacillus velezensis AF12, or Bhalotolerans AF23. Additionally, the consortium formed by Tatroviride and Rbadensis SER3 stimulated Athaliana PR1:GUS and LOX2:GUS for SA- and JA-mediated defence responses. Finally, the consortium of Tatroviride with SER3 was better at inhibiting pathogen growth, but the consortium of Tatroviride with UM270 was better at promoting Arabidopsis growth. These results showed that the biocontrol capacity and plant growth-promoting traits of Trichoderma spp. can be potentiated by PGPBs by stimulating its effector functions.

Read on: https://doi.org/10.1371/journal.pone.0301139

Effector_proteins
Trichoderma

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