Transformation of Tobacco with Rchsp1718 from Chinese Rose EnhancesTolerance to Different Abiotic Stresses Chemical constituents from flowers of Rosa chinensis Studies on Agrobacterium-mediated Transformation of Rose Callus with SeNHX1 Gene Essence Constituents of Rosa chinensis Flower Chemical constituents from flowers of Rosa chinensis Transformation of Tobacco with Rchsp1718 from Chinese Rose EnhancesTolerance to Different Abiotic Stresses