Pinus Susceptibility to Pitch Canker Triggers Specific Physiological Responses in Symptomatic Plants: An Integrated Approach

Joana Amaral, Barbara Correia, Carla António, Ana Margarida Rodrigues, Aurelio Gómez-Cadenas, Luis Valledor, Robert D. Hancock, Artur Alves, Glória Pinto (Lead / Corresponding author)

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Abstract

Fusarium circinatum, the causal agent of pine pitch canker (PPC), is an emergent and still understudied risk that threatens Pinus forests worldwide, with potential production and sustainability losses. In order to explore the response of pine species with distinct levels of susceptibility to PPC, we investigated changes in physiology, hormones, specific gene transcripts, and primary metabolism occurring in symptomatic Pinus pinea, Pinus pinaster, and Pinus radiata upon inoculation with F. circinatum. Pinus radiata and P. pinaster exhibiting high and intermediate susceptibility to PPC, respectively, suffered changes in plant water status and photosynthetic impairment. This was associated with sink metabolism induction, a general accumulation of amino acids and overexpression of pathogenesis-related genes. On the other hand, P. pinea exhibited the greatest resistance to PPC and stomatal opening, transpiration increase, and glycerol accumulation were observed in inoculated plants. A stronger induction of pyruvate decarboxylase transcripts and differential hormones regulation were also found for inoculated P. pinea in comparison with the susceptible Pinus species studied. The specific physiological changes reported herein are the first steps to understand the complex Pinus-Fusarium interaction and create tools for the selection of resistant genotypes thus contributing to disease mitigation.

Original languageEnglish
Article number509
Pages (from-to)1-16
Number of pages16
JournalFrontiers in Plant Science
Volume10
DOIs
Publication statusPublished - 24 Apr 2019

Keywords

  • Biotic stress response
  • Disease differential susceptibility
  • Forest tree disease
  • Gene expression
  • Plant hormones
  • Plant physiology
  • Plant primary metabolism

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    Amaral, J., Correia, B., António, C., Rodrigues, A. M., Gómez-Cadenas, A., Valledor, L., Hancock, R. D., Alves, A., & Pinto, G. (2019). Pinus Susceptibility to Pitch Canker Triggers Specific Physiological Responses in Symptomatic Plants: An Integrated Approach. Frontiers in Plant Science, 10, 1-16. [509]. https://doi.org/10.3389/fpls.2019.00509