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Efficiency of various growth regulators viz. gibberellic acid, salicylic acid, jasmonic acid, methyl jasmonate, putrescine, spermine and spermidine in improving the postharvest performance of cut scapes of Iris germanica L. was examined. Flower scapes harvested with the oldest bud at pencil stage (1 day before anthesis) were cut to a uniform length of 35 cm under water and divided into eight sets. Each set was provided with a different vase solution viz. gibberellic acid, salicylic acid, jasmonic acid, methyl jasmonate, putrescine, spermine and spermidine alone or in combination with 0.1 M sucrose. A separate set of scapes held in distilled water was designated as control. Application of putrescine in the vase resulted in the maximum enhancement of vase life by 6.4 days as compared to the control. All the growth regulators applied resulted in the significant increment of vase life against the control except for gibberellic acid which showed comparable vase life to control. Full blooming (100 %) was achieved in the scapes treated with putrescine and spermine alone or in combination with sucrose. Spermine treatment resulted in the burst of flowering on day 4 against the normal sequential blooming behavior of Iris species. Improved postharvest performance by the application of various growth regulators was associated with decrease in lipid peroxidase and lipoxygenase activity and an increased activity of various antioxidant enzymes like catalase, superoxide dismutase and ascorbate peroxidase besides maintaining higher values of soluble proteins, sugar fractions, total phenols and membrane stability index.
Proceedings of the National Academy of Sciences, India Section B: Biological Sciences – Springer Journals
Published: Jul 23, 2016
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