An Uncommon Plant Growth Regulator, Diethyl Aminoethyl Hexanoate, Is Highly Effective in Tissue Cultures of the Important Medicinal Plant Purple Coneflower (Echinacea purpurea L.)

Table 2

Effects of different concentrations of DA-6 on the growth of triploid buds*.

Concentration of DA-6 (mg/L)	Plant height (mm)	Weight per plant (mg)	Root weight per plant (mg)	Diameter of; thickest root (μm)	Total root no.	Length of primary root (mm)	Total root length (mm)	Root/top ratio
0	35.40 ± 4.52^a**	174.40 ± 24.65^b	27.20 ± 4.38^c	1310.42 ± 88.11^b	1.10 ± 0.18^b	32.75 ± 2.72^a	35.50 ± 5.18^b	22.21 ± 3.43^c
0.08	36.10 ± 3.26^a	186.10 ± 19.78^b	76.10 ± 12.14^b	1719.01 ± 54.83^a	7.30 ± 1.14^a	29.10 ± 3.53^a	49.60 ± 8.27^b	78.58 ± 10.79^a
0.16	45.10 ± 4.70^a	466.80 ± 19.81^a	160.70 ± 16.10^a	1818.27 ± 12.27^a	8.00 ± 1.01^a	21.20 ± 2.30^b	81.20 ± 15.26^a	57.24 ± 7.36^b
0.32	36.20 ± 5.45^a	478.60 ± 14.67^a	84.10 ± 4.44^b	1820.79 ± 18.77^a	9.70 ± 0.73^a	6.20 ± 0.55^c	40.60 ± 5.67^b	33.61 ± 1.74^c

∗Values for plant height, weight per plant, root weight per plant, diameter of thickest root, total root no., length of primary root, total root length, and root/top ratio are expressed as the mean ± SD.
∗∗Data in the same column followed by different letters are significantly different by Duncan’s test at P < 0.05.