Comparison and Screening Indicators for Ramie (Boehmeria nivea) Genotypes Tolerant to Cadmium Identification and Eevaluation of Major Agronomic Traits and Main Fiber Quality in Ramie Germplasm Resources STUDIES ON THE OCCURRENCE AND CONTROL OF RAMIE ANTHRACNOSE Genotype Difference and Early Evaluation of Drought Resistance in Ramie Cytological Observation on Different Ploidy Plants of Ramie (Boehmeria nivea) cDNA Cloning and Expression of Two Cellulose Synthase Genes from Boehmeria nivea AN ANATOMICAL STUDY ON THE FLOWERING MECHANISM OF MALE FLOWER OF RAMIE (BOEHMERIA NIVEA)