Identification of the pathogen causing leaf spot disease on Boehmeria nivea Effects of Exogenous Salicylic Acid on Physiological Characteristics and Yield of Ramie Under Drought Stress and Re-watering Cloning and Sequencing for ISSR Specific Fragments in Cytoplasmic Male Sterile, Maintainer and Restorer Lines of Ramie ( Boehmeria nivea) Cloning and Expression of Auxin-binding Proteins 1 Gene in Ramie [Boehmeria nivea (Linn.) Gaud.] Growth response, accumulation and transfer characteristics of ramie(Boehmeria nivea) under cadmium stress