In this former study, RNA expression stability of the housekeeping genes PGK, TUB, and ACT in stem tissues in the tomato cultivar ‘King Kong 2’ (which displays only moderate levels of resistance) was evaluated in conjunction with a silicon priming treatment conducted prior to infection with a highly virulent R. solanacearum strain (race 1, biovar 3). The gene discussed is PRKG1; the disease is infection.