application of microorganisms compared with nanoparticles of silver, humic acid and gibberellic acid on vase life of cut gerbera goodtimming

gerbera one of 10 important cut flowers in the world and iran. one of the most problems is low-life after harvest and neck bending. producers want to increase longevity of these flowers with using chemical solutions. with the aim of achieving the best chemical treatments to increase flower vase life gerbera goodtimming, nano silver (5 mg l-1), humic acid (50 mg l-1), gibberellic acid (2.5 mg l-1) and lactobacillus plantarum 110 cfu m l-1 and lactococcus lactis110 cfu ml-1 with sucrose (4%) compared with controls. this study in carried out with 6 replications. cut flowers recutted to 35 ± 2 cm, and then tested in different solutions for 20 days. the results showed that silver nanoparticles (5 mg l-1) +sucrose 4%+gibberellic acid 2.5 mg l-1with the 19.5 days vase life compared with controls (17.67days) had the highest durability. distilled water+ sucrose 4% with 5.98 mm stem diameter was better than control (5.49 mm) (p £0.01), while humic acid 50 mg l-1+ sucrose 4%+gibberellic acid 2.5 mg l-1 had lowest average daily stem diameter (5.44 mm), respectively. highest water uptake observed in silver nanoparticles 5 mg l-1+sucrose 4%+gibberellic acid 2.5 mg l-1 treatment (8.78 ml g-1 f.w.). silver nanoparticles 5 mg l-1+sucrose 4%+gibberellic acid 2.5 mg l-1 had highest fresh weight per day (24.89 g) and dry weight (4.96 g), respectively.