[Objectives] The aim of this paper was to investigate the effect of hypoxia on growth,morpho-anatomical acclimation and activity of enzymes involved in cell wall degradation and ethylene biosynthesis of cucumber seedlings.[Methods] A hypoxia-sensitive cucumber genotype(Cucumis sativus L.‘ Zhongnong 6’)was used and we investigated the effect of hypoxia on growth,morpho-anatomy and ethylene biosynthesis of seedlings under hypoxia stress.The activity of enzymes involved in cell wall degradation was also determined.[Results]After 7 d hypoxia stress,growth of the seedlings was inhibited significantly,with dry weight,leaf growth,root length and number of root tips being decreased greatly.Leaf tissue was compacted under hypoxia stress with the ratio of palisade cell increasing.The root base was swelling,meanwhile many lenticel and adventitious roots appeared on the hypocotyl.Aerenchyma was formed in the root elongation zone of the seedlings.Ethylene production of the seedlings under hypoxia stress was improved,with 1-aminocyclopropane-1-carboxylate synthase(ACS) activity being increased significantly.Also the enzymes involved in cell wall degradation were activated in roots and hycopotyls.[Conclusions] The cucumber seedlings under hypoxia stress undergone morphological and anatomical changes,with ethylene biosynthesis and cell wall degradation being stimulated.
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