Table 2.

Multiple regression of flea beetle feeding residual (BFR) corrected for trials against the sum concentration of four structural groups of pyrrolizidine alkaloids (PAs, µg/g dw) in the 84 F2 hybrid genotypes from a cross between Jacobaea vulgaris and Jacobaea aquatica. For the regression model: adjusted R ² = 0.2425; F _{15, 68} = 2.771; P = 0.002

Predictorsa	Estimate	t value
(Intercept)	−5.773	−1.112
Fw	11.680	3.706**
Sn	0.234	0.162
Jb	−0.117	−0.126
Er	0.276	0.180
Ot	0.492	0.771

**P < 0.01

^aSn, Jb, Er, Ot are log transformed concentration of senecionine-, jacobine-, erucifoline-, and otosenine- like PAs. Fw is the genotypic mean of leaf fresh weight