Relationship between Endopeptidase Activity in Petals and Tolerance to Water Deficit Stress of Two Cut Rose Cultivars Ascorbate Acid Increases Tolerance to Water Deficit Stress in Flowers of Cut Roses ( Rosa hybrida L. ) Caused by Enhanced Ascorbate Peroxidase Activity Effects of GSH on Tolerance to Water Deficit Stress in Cut Rose Involvement of Antioxidant Enzymes and Endoprotease in Tolerance to Water Deficit Stress in Cut Roses Effects of water limited deficit stress during different growth stages on leaf protective enzymes of winter wheat Effect of water-limiteddeficit stress in different growth stageson winter wheat grain yields and their yield constituents Effect of GSH Pretreatmen t on the Tolerance to Water Deficit Stress in Cut Rose ‘Samantha’and Related to Enhancement of GR Activity Ascorbate Acid Increases Tolerance to Water Deficit Stress in Flowers of Cut Roses ( Rosa hybrida L. ) Caused by Enhanced Ascorbate Peroxidase Activity Effects of GSH on Tolerance to Water Deficit Stress in Cut Rose Relationship between Endopeptidase Activity in Petals and Tolerance to Water Deficit Stress of Two Cut Rose Cultivars