Study of the Effect of Calcium Ion in dark-induced senescence leaves of peony

The effect of calcium ion on peony aging was studied. Different four calcium ion concentrations (0mmol/L,100mmol/L,250mmol/L, 500mmol/L) was setted. Leaf of the peony Roufurong on same growth pe riod was cultured in vitro, Chlorophyll concentration was measured per four days. The results revealed that calcium ion concentrations at 100mmol/L gave the slowest aging speed among four samples, and when calcium ion concentrations was 500mmol/L, peony was aging fastest.