Table 2.

Effect of α-pinene on radicle growth (cm) of test species measured after 7 d

	Plant species
Concentration (mm)	C. occidentalis	A. viridis	P. sativum	C. arietinum	T. aestivum
0	3·77 ± 0·28	4·68 ± 0·35	5·83 ± 0·09	10·46 ± 0·05	12·42 ± 0·22
1	3·55 ± 0·02ns	4·03 ± 0·19*	5·23 ± 0·35ns	9·29 ± 0·26**	10·31 ± 0·75**
2·5	2·74 ± 0·04**	3·12 ± 0·02**	3·78 ± 0·17**	8·20 ± 0·23**	5·52 ± 0·39**
5	0·61 ± 0·05**	2·37 ± 0·44**	1·98 ± 0·14**	4·37 ± 0·29**	0**
10	0·41 ± 0·12**	1·26 ± 0·10**	1·29 ± 0·07**	3·40 ± 0·35**	0**

Values are means ± s.e. (n = 5).

^*, ^** indicate significant difference from controls at P < 0·05 and P < 0·01, respectively, after applying Dunnett's test; ns: non-significant.