Relationships Between Some Protective Enzymes Activities, MDA Content and Male Inflorescence of Male Sterile Chestnut Cloning and Characterization of PeMYBL1, an R2R3 MYB Gene from Poplar Chilling and Heat Requirements of Main Cultivars of Ping‘ou Hybrid Hazelnuts (Corylus heterophylla×Corylus avellana) STUDIES ON CECIDOMYIA WENI JIANG STUDIES ON THE INJURIOUS CHARACTERISTICS AND ITS DENSITY ESTIMATE OF THE LARVAE OF DIORYCTEIA YIAI cDNA-AFLP Analysis of Differentially Expressed Transcripts in Early and Middle Development Stages of Male Inflorescence in White Birch(Betula platyphylla Suk.)