EFFECTS OF WATER STRESS ON SOME ENZYME ACTIVITIES RELATED TO RESPIRATORY METABOLISM IN LITCHI CHINENSIS LEAVES Effects of Hypoxia Stress on Anaerobic Respiratory Enzyme and Antioxidant Enzyme Activities in Roots of Cucumber Seedlings Changes of Photosystem Ⅱ and Respiratory Enzyme Activity in Transgenic Tobacco Enriched BADH Gene ACTIVITIES OF RESPIRATORY ENZYMES AT DIFFERENT DEVELOPMENTAL STAGES OF PANICLES AND ANTHERS IN CMS RICE AND ITS MAINTAINER