Tannins from Corylus heterophylla (Ⅲ) Economic Traits of Special Nut-Processed Cultivars of Ping’ou Hybrid Hazelnuts (Corylus heterophylla×C. avellana) Cloning and Expression Analysis of ChWRKY2 from Corylus heterophylla under Low Temperature Stress Cloning and Expression Analysis of ChWRKY28 from Corylus heterophylla Fisch Chilling and Heat Requirements of Main Cultivars of Ping‘ou Hybrid Hazelnuts (Corylus heterophylla×Corylus avellana) Study on the Medium Components Affection Pollen Germination and\nPollen Tube Growth of Corylus heterophylla×C.avellana Genetic Analysis of Nut Traits on Tester Strain of Hybrid Hazelnuts (Corylus heterophylla × C. avellana) Studies on components in leaves of Corylus heterophylla (Ⅱ) Correlations of the Nut and Catkin Quantity Properties of Corylus heterophylla×C.avellana Tissue Culture and Rapid Propagation of Corylus heterophylla Changes in the Relevant Oxidases during Cutting Rooting of Corylus heterophylla and the Cutting Propagation Technique Cloning and Temporal-Spatial Expression of a CBF Homolog Associated with Cold Acclimation from Corylus heterophylla CLONING AND EXPRESSION PROFILE ANALYSIS OF ChWRKY1 FROM Corylus heterophylla Fisch. A Micro-propagation Technique of Corylus heterophylla×C.avellana Studies on tannin components in hazel leaves of Corylus heterophylla Identification and Evaluation of Agronomic Traits for Corylus heterophylla Fisch. Accessions