The effect of exogenous spermine (Spm) on (A) sucrose synthetase (SS) and (B) sucrose phosphate synthase (SPS) activity in leaves of white clover under drought stress.

<p>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 (<i>P</i>≤0.05). L, cv. ‘Ladino’; L+Spm, cv. ‘Ladino’ added exogenous Spm; H, cv. ‘Haifa’, H+Spm, cv. ‘Haifa’ added exogenous Spm.