Communication Dans Un Congrès Année : 2024

Vectorized salicylic acid bioprecursors to stimulate plant natural defenses against disease

Résumé

Agriculture faces increasing pressure to innovate in response to the challenges presented by global change. The primary challenge implies reconciling increased agricultural production to meet growing nutritional demands of an expanding world population while concurrently reducing environmental impact. This requires a shift in the use of plant protection products and, consequently, the development of new systems for managing plant diseases. One such strategy involves the indirect manipulation of plant disease resistance by stimulating or priming their innate defense mechanisms. Numerous studies have demonstrated the key role played by salicylic acid (SA), an endogenous phytohormone, in orchestrating these defense mechanisms in plants (1). However, the exogenous application of SA is constrained by its phytotoxicity and inactivation by compartmentation, thus restricting its practical efficacy in agricultural contexts (2,3). Addressing this limitation, we propose the vectorized bioprecursor strategy. This approach involves conjugating SA with nutrients such as amino acids or glucose, facilitating its systemic distribution via the phloem sap and gradual release at target sites to activate defense mechanisms. Promising results have already been documented in a previous study utilizing a conjugate of SA with L-glutamic acid and a triazole spacer on maize. Pre-treatment of maize plants with this conjugate prior to inoculation with the phytopathogenic fungus Fusarium graminearum resulted in a significant reduction in disease symptoms (4). Building on this basis, a set of conjugates between SA and amino acids has been developed by multi-step synthesis. Their biological efficacy is currently being investigated, and initial assessments of their impact on stimulating plant defense mechanisms suggest a clear relationship between their chemical structure and the modulation of SA-responsive genes.

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Dates et versions

hal-04642137 , version 1 (09-07-2024)

Identifiants

  • HAL Id : hal-04642137 , version 1

Citer

Ruth Oussou, Cécile Marivingt-Mounir, Jean-François Chollet, Sylvain La Camera. Vectorized salicylic acid bioprecursors to stimulate plant natural defenses against disease. 14th International Conference of the French Society of Plant Biology, Société française de biologie végétale (SFBV), Jun 2024, Bordeaux, France. ⟨hal-04642137⟩
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