Diversity in susceptibility of<em> Botrytis cinerea</em> to biocontrol products inducing plant defence mechanisms

Communication orale au 6. IOBC-WPRS Meeting of the working group "Induced resistance in plants against insects and diseases". PR-proteins and induced resistance against pathogens and insects; 2011/09/04-08 ; Neuchatel (CHE)International audienceThe development of plant defence stimulants to increase host resistance represents anattractive alternative to fungicides for the protection of crops against plant pathogens. In this study we evaluated the efficiency of 14 products presumed to induce plant defence mechanisms against Botrytis cinerea on tomato and lettuce. Two days after the application of the products, tomato and lettuce leaves were inoculated with B. cinerea and incubated in conditions conducive to disease development.Out of 14 products tested, Serenade Max® (Bacillus subtilis QST713) proved to have a significantprotective efficacy against B. cinerea on both plants. To assess the presence of low susceptibility to Serenade Max in populations of B. cinerea, the protective efficacy of this product was evaluated against 20 strains differing in their geographic origin, host of isolation and level of aggressiveness. To this end, tomato and lettuce leaves were treated with Serenade Max two days before inoculation. The efficiency of the product was significantly influenced by the isolate of B. cinerea tested with protection levels ranging from 40% to 86% on tomato leaves and 0 to 80% on lettuce leaves. No correlation was observed between the level of aggressiveness of B. cinerea strains and the protection provided by the biocontrol agent

Diversity in susceptibility of Botrytis cinerea to biocontrol products inducing plant defence mechanisms

International audienc

Diversity in susceptibility of Botrytis cinerea to biocontrol products inducing plant defence mechanisms

International audienc

Diversity in susceptibility of<em> Botrytis cinerea</em> to biocontrol products inducing plant defence mechanisms

Communication orale au 6. IOBC-WPRS Meeting of the working group "Induced resistance in plants against insects and diseases". PR-proteins and induced resistance against pathogens and insects; 2011/09/04-08 ; Neuchatel (CHE)International audienceThe development of plant defence stimulants to increase host resistance represents anattractive alternative to fungicides for the protection of crops against plant pathogens. In this study we evaluated the efficiency of 14 products presumed to induce plant defence mechanisms against Botrytis cinerea on tomato and lettuce. Two days after the application of the products, tomato and lettuce leaves were inoculated with B. cinerea and incubated in conditions conducive to disease development.Out of 14 products tested, Serenade Max® (Bacillus subtilis QST713) proved to have a significantprotective efficacy against B. cinerea on both plants. To assess the presence of low susceptibility to Serenade Max in populations of B. cinerea, the protective efficacy of this product was evaluated against 20 strains differing in their geographic origin, host of isolation and level of aggressiveness. To this end, tomato and lettuce leaves were treated with Serenade Max two days before inoculation. The efficiency of the product was significantly influenced by the isolate of B. cinerea tested with protection levels ranging from 40% to 86% on tomato leaves and 0 to 80% on lettuce leaves. No correlation was observed between the level of aggressiveness of B. cinerea strains and the protection provided by the biocontrol agent

[2 x 2] metallo-supramolecular grids based on 4,6-bis((1H-1,2,3-triazol-4-yl)-pyridin-2-yl)-2-phenylpyrimidine ligands : from discrete [2 x 2] grid structures to star-shaped supramolecular polymeric architectures

The self-assembly of bis-tridentate ligands leads to the spontaneous formation of [2 x 2] grid-like metal complexes. However, the synthesis of such ligands is rather cumbersome. In the work, we demonstrate a straightforward synthesis route to prepare bis-tridentate 4,6-bis((1H-1,2,3-triazol-4-yl)-pyridin-2-yl)-2-phenylpyrimidine ligands through double CuAAC click chemistry with 4,6-bis(6-ethynylpyridin-2-yl)-2-phenylpyrimidine as well as their self-assembly into [2 x 2] grid-like metal complexes. In addition, four macromolecular ligands were synthesized starting from azido-end-functionalized poly(2-ethyl-2-oxazoline) (PEtOx) or poly(ethylene glycol) (PEG). These macromolecular ligands were used in the construction of star-shaped supramolecular polymers through complexation with transition metal ions (e.g., Fe2+ or Zn2+). The successful fabrication of complexes and star-shaped polymers was confirmed by UV-vis titration measurements and MALDI-TOF mass spectrometry. However, the chemical structure of the polymer was found to have a strong influence on the [2 x 2] grid formation, which was successful with the PEG-ligands but not with the PEtOx-ligands, while the molecular weight of the PEG did not interfere with grid formation