Active compounds and biological activity of in vitro cultures of some Echinacea purpurea varieties

Bulletin of the National Research Centre

Table 5 Effect of various concentrations of tyrosine on the total caffeic acid derivatives and total hydrolysable sugars contents of Double Decker and Rubinstern calli after three months of cultivation

Varieties	Tyrosine conc. (mg/l)	Total caffeic acid derivative conc. (mg/g DW)	Total hydrolysable sugar conc. (mg/g DW)
Double Decker	0	0.57^d	69.2^b
	50	2.67^a	86.3^a
	100	1.72^c	85.0^a
	150	2.22^b	90.0^a
LSD _0.05		0.16	5.55
Rubinstern	0	0.88^d	73.4^b
	50	2.33^c	93.8^a
	100	3.45^b	85.7^a
	150	8.41^a	70.0^b
LSD _0.05		0.05	10.95