Effect of putrescine and spermine spraying on increasing vase life of alstroemeria (cv.  Sukari'

In order to study the effect of pre and postharvest polyamines spraying on increasing vase life of alstroemeria (Alstroemeriaaurantica cv. Sukari)، an experimental was conducted on completely randomized factorial design with two types polyamines (putrescine، spermine) in four levels (zero، five، 10، 15 and 20 mg/l). Results showed that، 20 mg/l of putrescine and spermine treatments increased vase life to 19 and 20 days، and 10 mg/l increased vase life to 14 and 18 days، respectively. Putrescine and spermine treatments had a significant effect on leaf chlorophyll index in three stages of sampling. In the first stage of sampling، 20 mg/l putrescine concentration and 10 and 20 mg/l spermine concentration had a significant effect on fresh and dry weight. Concentrations of putrescine and spermine (10 and 20 mg/l) significantly increased catalase enzyme activity in the first and second stage of sampling and spermine effect was more than putrescine. Treatment of 20 mg/l spermine significantly increased superoxide dismutase enzyme activity and increased its activity until third stage of sampling. Putrescine and spermine significantly decreased chlorophyllase، pectinase and phenoloxidase and best treatment was 20 mg/l spermine. Treatments of putrescine and spermine (10 and 20 mg/l) had significant effect on increasing membrane resistance in the first and second stage of sampling. According to results it can be said that، spermin 20 and putrescine 10 mg/l had most effect on increasing vase life and decreasing senescence of alstroemeria flowers. Spermin was more effective than putrescine in increasing vase life of alstroemeria flowers