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Total sum of cytokinin ribosides in the four Hypericum species in M_0—PGR-free, M_1—0.2 mg/L BA, M_2—0.2 mg/L BA + 0.1 mg/L IBA and M_3—0.1 mg/L BA + 0.2 mg/L IBA supplemented media, HR–H. richeri Vill., HP–H. perforatum L., HT–H. tetrapterum Fries. and HC–H. calycinum. Same letters indicate statistically non-significant and different letters indicate statistically significant differences of the mean values when comparing the parameter between all samples.
