Effects of rare-earth element addition on seedling growth of Dendrobium candidum Effect of rare-earth elements La3+ on growth of hairy roots and normal roots of Rheum palmatum and their yield of anthraquinone Effects of La3+ on Tissue Culture of Gerbera jasmesonil ‘Sunbird’ The Effect of Plant Growth Substances and Rare-earth Elements on the Yield of Castanea henryi Effects of La3+ on Tissue Culture of Gerbera jasmesonil ‘Sunbird’