Seed biopriming with cyanobacterial extracts as an eco-friendly strategy to control damping off caused by Pythium ultimum in seedbeds

This work highlights the ability of various cyanobacterial extracts from Anabaena spp., Tolypothrix Nostoc or Trichormus, among others genera, to control incidence damping-off caused by Pythium ultimum in cucumber seedlings. Protocols applied aimed at preliminary characterization collection were very useful for predicting their phytotoxic, phytostimulating and biopesticidal capacity. First, phytostimulatory phytotoxic potential a 31 sonicated was analyzed calculating germination index watercress seeds increase loss seedling weight. Likewise, characterized according its inhibit growth P. dual culture bioassays detached-leaf test. Finally, after selecting most effective extracts, preventive bioassay performed based on seed biopriming. The strain SAB-M465 showed be efficient against vitro ultimum, while SAB-B912 more discreet this regard, but proved as stimulator. Seed biopriming strategy with cyanobacteria revealed remarkable promoter effect early stages plant development, although only positioned an agent seedbeds.