Cyst and root-knot nematode infection of roots of transgenic Arabidopsis thaliana
plants that over-expressed (OE) individual pathogenesis-related (PR) genes.
(A) Number of beet cyst nematodes, Heterodera schachtii, that developed to fourth-stage juvenile (J4) in
roots of Arabidopsis that over-expressed PR-1–PR-5 genes. (B) Number of galls induced
by the southern root-knot nematode, Meloidogyne incognita, in roots of Arabidopsis
that over-expressed PR-1–PR-5 genes. Data are the mean standard error (n = 20)
number of J4 or galls, respectively, for PR-OE relative to wild-type Columbia-0 (WT). An asterisk (*) indicates that the mean is significantly different (P < 0.05) from WT in a paired t-test.