Propagation of Rare and Endangered Plant Magnolia odoratissima

摘要

Magnolia odoratissima Law et R. Z. Zhou is an endemic species under State Protection Category II of China for its narrow distribution area, small population amount and size, few fruit and seeds and great difficulties in seed germination and propagation. This paper summarized the technological outline of sowing propagation, cutting propagation and layering propagation of M. odoratissima as follows: 1. The germination rate was greatly improved when seeds were stored with wet sands after disinfection; 2. The growth of young seedlings was evidently improved when their roots were soaked with 100 mg/L of ABT3 rooting powder before transplanting; 3. The seedlings grew strongly and trimly and had a bulky root system when they were cultured with the substrate consisting of 65% humus soil, 30% farmyard manure and 5% calciummagnesium phosphate; 4. When the young shoots are in semi-lignification in August, the l-2a branches can be chosen as cuttings and the rooting rate can reach more than 70% if the cuttings are dipped with 100 mg/L or 50 mg/L of ABT1 rooting powder; 5. Different concentration solution with ABT1 and GGR6 rooting powder both can evidently improve the rooting rate of layering propagation of M. odoratissima. There is little difference between the effects of above two kinds of rooting powder and their concentration should be less than 500 mg/L.