A Comparative Study of RAPD and Morphological Approaches to CharacterizeRelationships of Rosaroxburghii Tratt.and Its Relatives Development of the Embryo and Endosperm in Roxburgh Rose A Comparative Study of RAPD and Morphological Approaches to CharacterizeRelationships of Rosaroxburghii Tratt.and Its Relatives Co-changes of Antioxidant Enzymes and Ascorbic Acids During the Fruit and Leaf Development of Rosa roxburghii Ascorbate Contents and Activities of Some Antioxidant Enzymes during Senescence of Rosa roxburghii Leaves Co-changes of Antioxidant Enzymes and Ascorbic Acids During the Fruit and Leaf Development of Rosa roxburghii Ascorbate Contents and Activities of Some Antioxidant Enzymes during Senescence of Rosa roxburghii Leaves A Preliminary Study on Inher itance Tendency of the Resistance to PowderyMildew Using F1 Progen ies of Chestnut Rose ( Rosa roxburghii Tratt) A Preliminary Study on Inher itance Tendency of the Resistance to PowderyMildew Using F1 Progen ies of Chestnut Rose ( Rosa roxburghii Tratt)