Box-plot representation of expression ratios for 351 NP-responsive genes [34]. Quartile distribution of the expression ratios for the gene set is shown, where boxes represent Q1 and Q3 quartiles and the middle line of the box is the median (Q2), while whiskers show the minimum and maximum values and red diamonds represent outliers. (Pst, Abr) biotic stresses by bacteria or fungi, (drou, NaC, wou) abiotic stresses by drought, salt or wounding, (Ag20, Ag40, Ag80, AgN) addition of Ag NPs (10-, 20-, 40- and 80-nm diameter) or AgNO3, (Ti10, Ti20, Ti40, TiO2) addition of TiO2 NPs (10-, 20-, 40-nm diameter) or bulk TiO2, (CNT, +ABA) addition of CNTs or CNTs plus ABA. Notice that most genes are repressed under NP treatments.