Study on Factors Affecting Embryo Rescue of Seedless Grape Effect of naphthalencacetic acid and 2, 4-dicholorophenoxyacetic acid on callus cell ploidy and secondary metabolites of Glycyrrhiza uralensis Chromosome Ploidy and Related Enzyme Activities of Cymbidium goeringii Rhizome Induced Changes in Root Hydraulic Conductivity During Wheat Evolution Relationship between Chromosome Ploidy and Morphology Characters in Dendrobium The genetic diversity of 9 populations of dry-desert Agropyron mongolicum collected in northern China