Table 1.

Approximate F-test (F and P values) for the fixed effects and variance component estimates from REML (restricted maximum likelihood); analysis of the effect of foliar herbivory (by P. brassicae) and root-type on nitrogen and glucosinolate levels of B. nigra roots

Factors	Nitrogen		Neoglucobrassicin		Glucobrassicin		Gluconasturtin		Sinigrin
	F	P	F	P	F	P	F	P	F	P
Foliar herbivory (1)	1.6	0.2	15.0	<0.001	15.3	<0.001	0.5	0.4	1.7	0.2
Root-type (2)	28.4	<0.001	28.5	<0.001	89.5	<0.001	4.57	0.03	0.001	0.9
Interaction (1.2)	0.4	0.5	2.9	0.08	0.2	0.5	0.7	0.3	1.4	0.2