Evaluation of the in vitro antimicrobial activity of leaves extracts of different cultivars of Fragaria ananassa Duch. for phytosanitary bioproducts formulation

Abstract

In this work, methanolic and aqueous extracts from leaves of five genotypes of Fragaria ananassa Duch. were characterized based on their total phenolic compounds content and the ability to inhibit the growth of bacterial and fungal phytopathogens. Genotypes studied were: “Camarosa”, “Camino Real”, “Merced”, “Benicia” and “San Andreas” (this last one from two origins: Tafí del Valle, Tucumán and Patagonia). No significant differences were observed in the phenolic content except for the methanolic extract (ME) of the “Merced” genotype that presented the highest value and the aqueous extracts (AE) of the “San Andreas” genotypes from Tafí del Valle and “Camarosa”, which exhibited the lowest value. Bacteria showed greater sensitivity than fungi to ME, whereas in the case of AE both types of microorganisms showed a similar sensitivity. No direct correlation was observed between the content of total phenolic compounds and the antimicrobial activity. Although some strawberry genotypes showed specific antimicrobial activity, in general all evaluated genotypes showed a similar behavior and would be equally valid for the development of bioproducts. The aqueous extracts stand out for the development of bioproducts of low production cost, taking advantage of the crop residues of the strawberry crop.