Assessing Frost Hardiness of Malus sieversii Natural Populations by Electrical Impedance Spectroscopy Cold Hardiness and Its Relationship with the VRN1 Genotypes in Wheat Varieties in the Yellow-Huai-Hai River Valley Region of China Structural Association of Endoplasmic Reticulum with Other Membrane Systems in Populus deltoides Apical Bud Cells and Its Alterations During the Short Day-induced Dormancy Cloning and Expression Analysis of MDHAR from Lilium longiflorum Identification and Characterization of a Dehydroascorbate Reductase Gene in Maize (Zea mays L.) Effect of External AsA on the Photoinhibition of Ginger Leaves in vitro Functional Divergence of Dehydroascorbate Reductase Genes in Pinus densata, P. tabulaeformis and P. yunnanensis