The berries of blackcurrants are
commercially important and rich
in antioxidants and have a high free radical scavenging capacity.
Four controlled fields 1 ha in size were set up in an organic farm
to test two commercial plant probiotic products, ProbioHumus and NaturGel,
and their combined impact on blackcurrant berry yield and quality.
Spray applications of ProbioHumus, NaturGel, and their combination
significantly increased fruit yields 38, 25, and 16%, respectively,
versus the nontreated control. The berries from plants inoculated
with probiotics had significantly higher contents of anthocyanins
versus the nontreated control and tended to exhibit increased levels
of ascorbic acid. The blackcurrant berries treated with both probiotics
exhibited a fair ability to scavenge DPPH free radicals. This is the
first study of the improvement of both the yield and the quality of
blackcurrant berries by the application of commercial plant probiotics
under field conditions.