Health-Promoting Compounds in Stevia: The Effect of Mycorrhizal Symbiosis, Phosphorus Supply and Harvest Time.

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Silvia TavariniLuciana G Angelini

Abstract

This work aimed to establish the synergic role of arbuscular mycorrhizal fungi (AMF) symbiosis, phosphorus (P) fertilization and harvest time on the contents of stevia secondary metabolites. Consequently, steviol glycosides (SVglys) concentration and profile, total phenols and flavonoids as well as antioxidant assays, have been assessed in inoculated and no-inoculated plants, grown with or without P supply and collected at different growth stages(69, 89 and 123 days after transplanting).The obtained results suggest that the synthesis of stevia secondary metabolites is induced and/or modulated by all the investigated variability factors. In particular, AMF symbiosis promoted total SVglys content and positively influenced the concentration of some minor compounds (steviolbioside, dulcoside A and rebaudioside B), indicating a clear effect of mycorrhizal inoculation on SVglys biosynthetic pathway. Interestingly, only the mycorrhizal plants were able to synthesize rebaudioside B. In addition, P supply provided the highest levels of total phenols and flavonoids at leaf level, together with the maximum in vitro antioxidant activities (FRAP and ORAC). Finally, the harvest time carried out during the full vegetative phase enhanced the e...Continue Reading

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Citations

Dec 11, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Halina Maria Ekiert, Agnieszka Szopa
Apr 4, 2021·International Journal of Molecular Sciences·Raffaella BalestriniElisa Zampieri

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Methods Mentioned

BETA
glycosylations
Assay

Software Mentioned

MARS
GraphPad
GraphPad Prism

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