Extracts from green and brown seaweeds protect tomato (Solanum lycopersicum) against the necrotrophic fungus Alternaria solani

Seaweed extracts’ multifactorial action: influence on physiological and biochemical status of Solanaceae plants

“…[33] received similar results also as an effect of S. johnstonii application, and Stępowska [34] by Ascopyllum nodosum application. A larger root system was more effective in water and nutrient utilization leading to enhanced root and shoot growth and improved plant physiological status [29,[31][32][33]35]. The references regarding positive effects of SWE are not always unambiguous.…”

“…Several reports have shown that SWE induce protection against fungal, bacterial, and viral pathogens in plants. Defense response occurs after perception of signal molecules, called elicitors, derived from pathogens or from the host plant [35]. SWE polysaccharides can act as elicitors of plant defense responses and enhance resistance against pathogens.…”

“…Ulva lactuca extracts induced the expression of systemic wound response genes. Caulerpa sertularioides, Padina gymnospora, and Sargassum liebmannii extracts were involved in the other, unidentified mechanisms [35]. Ascophyllum nodosum enhanced foliar resistance to Phytophthora capsici in pepper [49].…”

The Effect of Growth Regulators and a Biostimulator on the Health Status, Yield and Yield Components of Potatoes (Solanum tuberosum L.)

“…In tomato seedlings, the fungal spore suspension enhanced systemic resistance through induction of growth hormones (indole-3-acetic acid, IAA and gibberellic acid, GA3) and defense-related enzymes (peroxidase, polyphenol oxidase and superoxide dismutase). Hernández-Herrera et al (2014) demonstrated that application of extracts from green (Ulva lactuca, Caulerpa sertularioides) and brown alga (P. gymnospora, Sargassum liebmannii) have suppressive effects on Alternaria solani infecting tomato.…”

A Biostimulant Preparation of Brown Seaweed Ascophyllum nodosum Suppresses Powdery Mildew of Strawberry

“…The induction of defense-related enzymes including PAL, PO, and PPO was observed 72 h post-inoculation, and further increased up to 120 h in ANE treated plants. Several studies showed that the elicitation of resistance against fungal pathogens by seaweed extract was mediated by an increase in PAL, PO, and PPO activity (apple, cucumber, carrot, and tomato) (Ali et al, 2016; Hernández-Herrera et al, 2014; Jayaraj et al, 2008; Jayaraman et al, 2011). In these studies, the increased plant’s resistance to different pathogens was marked by the enhanced activity and expression of different defense-related genes involved in the accumulation of secondary metabolites.…”