Effects of Exogenous Spermidine on Polyamine Contents and the Activities of the Enzymes Relating to Respiratory Metabolism in Cucumber Roots Suffering Hypoxia Effects of water-logging on anaerobic respiration enzymes and fermentation products in roots of two kind of sweet cherry rootstocks Ca2+ Effects on the Growth of Cucumber Seedlings and the Anaerobic Respiration Enzymes in their Roots under Rhizosphere Hypoxia Stress Effects of soil compaction stress on respiratory metabolism of cucumber root. Respiratory Metabolism of Pakchoi Seedlings Roots under Water Logging Stress