Abstract:
Davidia involucrata Baillon,as a unique monotypic species,is listed as Class I at the national key protected plants,which has highly ornamental,economic and ecological value. In this paper,based on the principle of "Seed Collecting in Near Zone ",investigations were made on the biologic characteristics,breeding,cultivation and domestication of
D.involucrata in Chengdu Plain. The results showed that 1) when shoots cuttings were treated by 50 mg·kg
-1 indole butyric acid, the rooting rate of 5 to 6 years old dove trees was approximately 70%; the rooting rate of 11 to 15 years old dove trees was 50% or less. Different hormones(IBA,NAA,IAA) were compared on softwood rooting rate. Treatments with IBA and NAA exhibited an obvious rooting rate,their rooting rate was between 65% to 97%. Compared with softwood cuttings,hardwood cuttings' rooting rate was significantly low,at the highest its rate base rooting initiation under paragraph was only 5.5%. 2) The plant height of the grafted seedlings was lower than the seedlings from seeds,and larger in diameter. Overall,grafting seedlings were healed well,and plants were robust. 3) Different sand methods had no obvious effect on seed germination rate. 4) The survival rate of high-pressure nursery was about 87.6%, especially in
D.involucrata forest, providing early flowering seedlings in the short term. Meanwhile,the management of
D.involucrata cultivation techniques was summarized from a low altitude introduction and cultivation,sowing breeding,breeding and grafting cuttings breeding,etc. It would provide scientific reference for the introduction, breeding and conservation of natural resources of
D.involucrata.