Could the Interaction between Arbuscular Mycorrhizal Fungi and Biostimulants Improve the Plant Physiological Status of Prosopis alba Seedlings?

Abstract

This study aimed to evaluate the synergy between arbuscular mycorrhizal fungi (AMF) and foliar biostimulant applications (phytoextracts) on an important Argentinian forest native species (Prosopis alba) during the nursery stage. We tested biochemical parameters (MDA, malondialdehyde, an oxidative stress biomarker, and photosynthetic pigments) on P. alba seedlings sprayed with three different phytoextracts and inoculated with mycorrhizal strains of different local origins. Considering that the statistical model was not significant at the preliminary level, we did not observe synergism between the different forms of bioinsumes evaluated by analysing biochemical characteristics. However, regardless of AMF inoculation, plants with foliar applications of Larrea divaricata at 3% w/v showed a lower accumulation of the oxidative stress biomarker, MDA and a lower total carotenoid content (p > 0.1). Although there were no significant differences, trends indicate positive relationships between neck diameter and mycorrhizal response in plants treated with M1 with foliar applications of Larrea divaricata at 3% w/v. However, height does not consistently respond to mycorrhizae interacting with biostimulants. Consequently, deeper analysis is needed to understand the effect of the interaction between AMF with biostimulants for improving the plant’s physiological status. Deepening research in this regard will result in significant benefits for restoration activities.