Alginate oligosaccharides trigger multiple defense responses in tobacco and induce resistance to Phytophthora infestans

Alginate oligosaccharides (AOSs), important plant immunity inducers, are widely used in agriculture because of their important role in the biological control of crop diseases. However, the mechanism by which AOSs induce plant resistance to pathogens is not clear. Here, we report AOS with a degree of polymerization of 2–5, which was obtained by a newly reported enzyme Aly2. AOS treatment exhibited high activity in enhancing resistance to Phytophthora infestans ( P . infestans ). AOS significantly induced reactive oxygen species (ROS) accumulation, calcium influx, stomata closure, and callose deposition. The salicylic acid (SA) synthesis-related gene and the defense-related genes were upregulated after AOS…

• NN
  National Natural Science Foundation of China

  Award: 32101035
• NS
  Natural Science Foundation of Shandong Province

  Awards: ZR2021QC025, ZR2023QC061