Fig 9. The effect of exogenous spermine (Spm) on (A) Y₂SK gene, (B) Y₂K gene and (C) SK₂ gene relative transcript abundance in leaves of white clover under drought stress.

Vertical bars indicate ±SE of mean (n = 4). Different letters above columns indicate significant difference for comparison at a given day; the same number of asterisks above columns means significant differences for a particular treatment across days of drought stress don’t exist. LSD (P≤0.05). L, cv. ‘Ladino’; L+Spm, cv. ‘Ladino’ added exogenous Spm; H, cv. ‘Haifa’, H+Spm, cv. ‘Haifa’ added exogenous Spm.