(Clay et al., 2009), is induced in roots of P. indica-treated plants
(Jacobs et al., 2011). The intracellularly migrating J2s do cause
severe cell damage and thus may have to cope with glucosinolate-
based plant defence in a compatible plant–nematode
interaction. Salicylic acid-mediated signalling may also be
involved in the A. thaliana–P. indica–H. schachtii interaction
since this hormone was shown to have a significant inhibitory
effect on H. schachtii (Wubben et al., 2008), and root inoculation
with P. indica (3 dpi) upregulated expression of CBP60g
and SID2, markers of the salicylic acid-mediated signalling
pathway (Jacobs et al., 2011).