A Plant Biostimulant from Potentiates Plant Growth Promotion and Stress Protection Activity of CHA0.

Abiotic stresses, including salinity stress, affect numerous crops, causing yield reduction, and, as a result, important economic losses. Extracts from the brown alga (ANE), and compounds secreted by the strain, CHA0, can mitigate these effects by inducing tolerance against salt stress. However, the influence of ANE on CHA0 secretion, and the combined effects of these two biostimulants on plant growth, are not known.

Plant G-protein signaling cascade and host defense.

The heterotrimeric guanine-nucleotide-binding proteins (G-proteins) play a crucial role in signal transduction and regulate plant responses against biotic and abiotic stresses. Necrotrophic pathogens trigger Gα subunit and, in contrast, sometimes Gβγ dimers. Beneficial microbes play a vital role in the activation of heterotrimeric G-proteins in plants against biotrophic and necrotrophic pathogens.

Combined application of Ascophyllum nodosum extract and chitosan synergistically activates host-defense of peas against powdery mildew.

Background: Powdery mildew (PM) is an important disease of pea that reduce yield. Ascophyllum nodosum extract (ANE) and chitosan (CHT) are biostimulants used to improve plant health. Efficacy of ANE and CHT was assessed individually and in combination against pea powdery mildew.