Fig. 2
The effect of drought stress on Chl a (a), SiO2-NPs on Chl a (b), drought stress × genotype on Chl a (c), drought stress × genotype on Chl b (d), SiO2-NPs × genotype on Chl b (e), drought stress × genotype on total Chl (f) and SiO2-NPs × genotype on total Chl (g). Different letters indicate significant differences according to the LSD test at P < 0.05