Studies On Cross Breeding And Application Of Hippeatrum Hybridum

Hippeatrum vittatum is a species of Amaryllidaceae.Hippeatrum hybridum is a generic term for modern horticultural hybrids of Hippeatrum and has many varieties. A series of methods and techniques were studied about biological characteristics,cross breeding,propagation and forcing culture in Hippeatrum hybridum.1.Biological characteristics and ornamental properties were studied for thirty four introduced varieties of Hippeatrum Hybridum.The results indicate:the imported varieties can be divided into 10 kinds according to its 2 levels characteristics and breeding aims.For the imported flowering bulbs of Hippeatrum Hybridum,the leaf area is increased in long time,most quickly in June.The bulbs size is reduced first,and then increased,but seeding bulbs size is increased all through.Forming the first flower bud needs about twenty months for seeding plants and four or more flower buds can be formed in third year.Chemical treatment can't improve setting percentage of artificial pollination supplementary.2.New varieties of Hippeastrum hybridum were selected through general artificial crossing method.167 new varieties were selected from 20000 F1 crossbreeding plants which parents are 67 combinations of 12 imported varieties.At last,35 excellent varieties were obtained by selecting again in 167 new varieties.They all had good characteristics such as big and trim flower,bright color,straight stem,strong growth potential.What we need to do in next year is continuing observation and asexual propagation of excellent individual plants.Average stem diameter of crossingbreeding seedling growing two years exceeds 5cm and the average per- mu yield can reach 20000 plants.3.New varieties were propagated by cutting,digging and tissue culture. Propagation effect is much different in different varieties using same cutting method and same treatment time.Propagation effect is also different in same varieties using different cutting method.Propagation rate is different in different bulb scales,out scale＞middle scale＞inner scale.August is the best time for cutting bulbs.Propagation effect of 16 same shares cutting is better than ditching on bulbs.Inducement effect is best by seeding in cuvette.The best culture medium for multiplication is MS+6-BA1.5mg/1+NAA0.1mg/L and the rooting culture medium is MS+NAA0.5mg/L.4.Methods of emperature control etc.evaluated of different varieties of H.hybridum forcing culture results.Research shows that:Forcing culture of different varieties contributed greatly different,'Donau' etc.are planted easily.Low temperature treatment 40 days,remained leaves in pot and roots-promoted help forcing culture of H.hybridum.From low temerature to flowers blossom best days for 100 days or so. PP333 treatment can be effective dwarf potted flowers.