Davidia involucrata Baill,the epibiotic species of ancient tropical plants of Tertiary Period,is a peculiar property in China.It's known as the "living fossil" of the plant kingdom like the giant panda of the animal kingdom.Davidia involucrata Baill is of great value in observing,ecology and economics.As its natural production rate is very low,it's necessary to increase the population of Davidia involucrata Baill by artificial way.At present,common ways of artificial cultivation are seed seeding,cutting reproduction and tissue culture.The seed ofDavidia involucrata Baill have a long dormancy stage with low germination rate,so seeds are often processed by mechanical damaging,poikilothermic treatment,chemical reagent or urine of people and animals.All these treatments could only improve its reproduction rate to a certain degree without significant effect.A better way is to process the seed by lamination of greensand.Besides,tissue culture by using winter buds,roots,stem or leaves ofDavidia involucrata Baill can also be a way to increase the quantity.
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