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 1

Effects of different concentrations of DA-6 on the growth of diploid 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	45.44±3.66^b∗∗	291.89 ± 13.39^b	28.89 ± 1.41^c	965.93 ± 36.69^c	5.89 ± 0.65^b	41.88 ± 3.52^a	78.44 ± 8.99^c	11.72 ± 0.78^c
0.08	63.11 ± 3.47^a	679.11 ± 31.89^a	190.33 ± 8.71^a	1421.06 ± 109.45^b	26.78 ± 2.59^a	44.77 ± 3.72^a	217.78 ± 26.34^a	47.73 ± 3.73^a
0.16	48.22 ± 3.23^b	344.89 ± 25.82^b	96.56 ± 8.17^b	1739.05 ± 45.42^a	9.00 ± 0.47^b	25.88 ± 1.18^b	133.22 ± 10.61^b	40.88 ± 5.38^b
0.32	30.11 ± 2.60^c	221.89 ± 21.00^c	59.89 ± 5.25^d	1318.68 ± 80.53^b	8.78 ± 0.81^b	14.77 ± 1.41^c	114.89 ± 17.46^bc	37.35 ± 7.15^b

∗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.