Microbial-based biostimulants modulate antioxidant activity, bioactive compounds and sesquiterpene lactones profile of globe artichoke
In the present study, yield components and plant secondary metabolites response to two commercial microbial-based biostimulants: arbuscular mycorrhizal fungi (AMF) and AMF+PGPR (plant growth promoting rhizobacteria), was evaluated in artichoke Romanesco C3 grown in five experimental fields in Campania (south Italy). Plants inoculated with AMF+PGPR and AMF provided significant higher artichoke head numbers per plant compared to the non-inoculated plants (+17.7 and 16.1% respectively). Differences in antioxidant activity and total phenols content in artichoke heads were mainly dictated by plant parts and by the effect of location fields with no significant differences due to microbial-based biostimulants. Artichoke sesquiterpene lactones pattern was characterized using two complementary mass spectrometers, Orbitrap-HRMS and MS/MS. Six sesquiterpene lactones were identified in leaves and edible part of the crop. Cynaratriol and cynaropicrin were the most abundant compounds detected in the edible part. This second compound was the most abundant SL observed in leaves up to 5 fold higher when compared to its edible part content. The activation of plant secondary metabolism in response to AMF inoculation with or without bacteria didnt report a significant effect on the total sesquiterpene lactones content, with decrease of the main compounds content when inoculated with AMF. Heads and leaves mean weight, N, P and TP content showed spatial variability with considerable predominance for samples harvested in the control field 1. Yield and quality parameters varied widely among location fields, confirming the biological and the environmental influence of the cultivation area.
Colonna, E., Rouphael, Y., Barbieri, G. and De Pascale, S. (2021). Microbial-based biostimulants modulate antioxidant activity, bioactive compounds and sesquiterpene lactones profile of globe artichoke. Acta Hortic. 1320, 421-428
Cynara cardunculus L. var. scolymus (L.) Fiori, mycorrhizal symbiosis, sesquiterpene lactones, total phenols, high resolution mass spectrometry