Phytotoxicity of compounds 1, 2, and 6–8 (50 ppm) toward seedling growth^a.

Strains	Root length (mm)		Hypocotyl length (mm)
	Amaranth	Lettuce	Amaranth	Lettuce
6	0.00 ± 0.00	0.00 ± 0.00	4.15 ± 0.19	0.00 ± 0.00
7	0.00 ± 0.00	2.25 ± 0.26	4.90 ± 0.45	3.45 ± 0.26
8	0.00 ± 0.00	7.90 ± 0.41	6.00 ± 0.39	5.07 ± 0.21
gp	0.00 ± 0.00	0.00 ± 0.00	0.00 ± 0.00	0.00 ± 0.00
H2O	12.08 ± 0.43	21.00 ± 1.07	7.34 ± 0.26	9.00 ± 0.54

^aValues means ± SD. The length < 2.0 mm was regarded as no germination.