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Leila Aslani, Mostafa Mobli, Mohammad Solemani,
Volume 2, Issue 1 ((Spring and Summer) 2015)

The effect of spermidine on seed germination of three different cucumber cultivars under cold stress was studied as a 4×2 factorial experiment by using a completely randomized design with 4 replications. The first factor was 4 concentrations of spermidine consisted of 0 (control), 0.1, 0.5 and 1 mM and the second one was three cucumber cultivars consisted of ‘Emperator’, ‘Amiran’ and ‘Rashid’. For this purpose, 50 seeds of each cultivar were placed on filter papers inside sterilized Petry dishes and spermidine solutions were added to them according to each treatment. All petry dishes were placed at a 13°C temperature of the incubator until end of the experiment and germinated seeds were counted daily. The measured traits were the percentage of germination, plumule length, radicle length, the dry and fresh weight of the plumule and radicle. The results showed that treating seeds of ‘Rashid’ cultivar with 0.1 mM spermidine increased the percentage of germination, plumule and radicle length, fresh and dry weights of radical compared with control. Treating ‘Rashid’ seeds with high concentration (1 mM) of spermidine showed inhibitory effects on all measured characteristics, but in ‘Amiran’ cultivar only decreased the percentage of germination, plumule and radicle length, the fresh and dry weight of radicle.

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