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Plant growth regulators play a significant role in germination of seed. In this study, Effects of exogenous polyamines (spermine and putrescine) on germination of seed and seedling growth such as radicula length, hypocotile length, fresh weight, dry weight of pepper under salt stress were investigated. According to results, increased salt concentration resulted in a significant reduction in germination (P<0.05). NaCl prevented hypocotile growth and this inhibition was reversed by applying spermine. During application of 2 mM spermine + 200 mM NaCl (P<0.05), the best germination was recorded. On the contrary, germination of seed was inhibited by single application of Put but hypocotile and radicula length of seedling were increased seriously by application of 0.01 mM putrescine + 200mM NaCl and 1mM putrescine + 50 mM NaCl (P<0.05) in pepper plant.

This work investigates the supercritical CO 2 extraction of capsidiol from pepper fruit tissues activated with Alternaria alternate (Fr) Keissler suspension culture as a biotic elicitor. Capsidiol production in the fruit tissue was markedly increased by the treatment with a biotic elicitor and reached its maximum level after 4 days of elicitation. The effects of separation parameters such as temperature, pressure, supercritical solvent flow rate, particle diameter and also initial capsidiol concentration were investigated on solubility, initial extraction rate and extraction yield. The optimal extraction conditions were obtained at the temperature of 40• C, the pressure of 400 bar, the supercritical CO 2 flow rate of 2 cm 3 min −1 , and the average particle diameter of 116 µm. The results showed that the ratio of the supercritical CO 2 extraction yield to the organic solvent extraction yield was changed from 84 to 97 wt-% depending on the initial capsidiol concentration.

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