PRTN3 and Nematoda infectious disease: However, there was no significant increase in endogenous levels of the phytohormone JA in nematode-infected plants 14 dpi (Mann–Whitney U = 66.000, P = 0.76, sig ≤ 0.05, 2-tailed) (Figure 1B) or in the expression of genes involved in the signaling of JA, PR-3 (P ≤ 0.11) or JAZ-1 (P ≤ 0.286) (Figure 1C) suggesting that nematode infection does not elicit a systemic JA defense response in the leaves of potato plants.