Relativity among starch quantity, polysaccharides content and total alkaloid content of Dendrobium loddigesii Analysis of H-NMR Fingerprint in Stem of Dendrobium loddigesii RAPD Analysis on germplasm resources in different populations of Dendrobium loddigesii Comparison of Methods of Genomic DNA Extraction from Dendrobium loddigesii Rolfe Inoculation Methods and Effects of Beneficial Symbiotic Fungi of Dendrobium loddigesii Rolfe.(Orchidaceae) Growth dynamic and standard degree of Dendrobium loddigesii test-tube seedling