Effect of Adjustment for Inorganic Salt Contents on Adventitious Buds Proliferation and Growth of Opisthopappus taihangensis in vitro Aseptic Germination and Rapid Propagation by Tissue Culture from Space Returned Seeds of Rehmannia glutinosa f. hueichingensis (Chan et Sehih) Hsiao APPLICATION OF QUADRATIC REGRESSIVE ORTHOGONAL DESIGN TO OPTIMIZE REGENETATION SYSTEM OF Dianthus caryophyllus L. Influence of several plant growth substance on propagation of GGB of Cymbidium grandiflorum An Efficient Axillary Bud Multiplication System of Acacia mangium × A. auriculiformis OPTIMIZATION OF THE CONCENTRATION OF 6-BA AND NAA IN THE RAPID PROPAGATION OF Russelia equisetiformis