Studies on components in leaves of Corylus heterophylla (Ⅱ) Identification and Evaluation of Agronomic Traits for Corylus heterophylla Fisch. Accessions Cloning and Expression Analysis of ChWRKY2 from Corylus heterophylla under Low Temperature Stress CLONING AND EXPRESSION PROFILE ANALYSIS OF ChWRKY1 FROM Corylus heterophylla Fisch. Tannins from Corylus heterophylla (Ⅲ)