Proteomics analysis of Medicago truncatula response to infection by the phytopathogenic bacterium Ralstonia solanacearum points to jasmonate and salicylate defence pathways

Ahad Yamchi, Cécile Ben, Michel Rossignol, Sayed Reza Zareie, Aghafakhr Mirlohi, Badraldin Ebrahim Sayed-Tabatabaei, Carole Pichereaux, Ahmad Sarrafi, Martina Rickauer, Laurent Gentzbittel

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The infection of the model legume Medicago truncatula with Ralstonia solanacearum GMI1000 gives rise to bacterial wilt disease via colonisation of roots. The root and leaf responses to early infection (1 and 3 days post infection) were characterised to investigate the molecular mechanisms of plant resistance or susceptibility. A proteomics approach based on pools of susceptible and resistant recombinant inbred lines was used to specifically target the mechanisms for tolerance. Differential abundances were evidenced for proteins involved in defence (e.g., PR5, PR10, or Kunitz protease inhibitors) and signalling pathways (such as cyclophilin). R. solanacearum inoculation modifies expression levels of those genes, either in both genotypes (AOS1, LOX4, and proteinase inhibitors) or specifically in the resistant line (PR proteins). Exogenous application of salicylic acid (SA) enhanced tolerance to the bacteria, whereas methyl jasmonate (MeJA) enhanced short-term tolerance then promoted disease in the susceptible ecotype, suggesting that they may mediate defence responses. Conversely, proteomics-identified genes were also shown to be SA or MeJA responsive. This is the first description of differential response to R. solanacearum in M. truncatula. Our results suggest that root basal defence is activated at 1 dpi, together with the JA pathway. Specific resistance is then evidenced at three dpi, with the up-regulation of SA-dependent PR proteins.

Original languageEnglish
Article numbere12796
JournalCellular Microbiology
Volume20
Issue number4
DOIs
Publication statusPublished - Apr 2018
Externally publishedYes

Keywords

  • barrel medic
  • hydroponic culture
  • proteomics
  • RILs
  • root disease

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