Studies On Comparing Sexual And Asexual Propagation In Dioscrea Zingiberensis C.H.Wright

In this study, observing Dioscrea Zingiberensis C.H.Wright' s biological characters, such as the germination character of seeds, the flowering habit, the growing regular pattern in sexual and asexual propagation, comparing its yield and diosgenin content of underground stem in plants. The main results are as follows:(1) The germination rate of seed in sexual propagation was lower than asexual propagation, it was highest that seeding in Petri-dish, seeding in tray took second place, it was worst that seeding in land. And it was better to seeding at mid-march.(2) The annual sexual reproduction plant was modest, and had no reproductive growth period. Their growth stage was about a month longer than that of plants in asexual propagation. Its dry matter content was higher by 4.1% than the annual asexual reproduction plant, its yield of single plant was lower very much, diosgenin of content was only lower by 0.03%.(3) The sexual reproduction plant in the second year were hardly difference with the asexual propagation plant in the first year, and every data about the sexual reproduction plant in the third year was higher than the asexual propagation plant in the second year, so sexual propagation plants should postpone one year to reap.(4) No matter sexual or asexual propagation plants, its correlation between warter content and diosgenin content of underground stem in one year was positive significance, but in two year, the correlation was negative significance.(5) The yield and diosgenin content of underground stem were different with different regions planted. The yield and diosgenin content of material from Shimen Xiayinhe county of Hunan were higher than thatof the others. As to sexual propagation, its difference on different regionswas obvious than asexual propagation.(6) The morphological of leaves was various, but the diosgenin content of plants with colour leaf was higher than that of plants with green leaf, and the diosgenin content of wide leaf type or deeply splitting type was higher than long leaf type or light splitting type. The sexual reproduction plant has similar trends too.