Fig. 4From: Modulation of physiological and biochemical traits of two genotypes of Rosa damascena Mill. by SiO2-NPs under In vitro drought stressThe interactive effect of drought stress × SiO2-NPs on leaf proline content (a), drought stress × genotype on proline content (b), and SiO2-NPs × genotype on proline content. Different letters indicate significant differences according to the LSD test at P < 0.05Back to article page