Effects of brassinolide on the antioxidant system and photosynthesis of cucumber seedlings under suboptimal temperature, light and salt environment. Spectrin-like Protein in the Phloem of Cucumis sativus EFFECT OF EXOGENOUS SPERMIDINE ON POLYAMINE CONTENT AND ANTIOXIDANT ENZYME ACTIVITIES IN ROOTS OF CUCUMBER SEEDLINGS UNDER ROOT_ZONE HYPOXIA STRESS Establishment for induction system of female flowers in steriled seedlings of Cucumis sativus