首页|Timing and Hormones Affected Rooting of Stem Cuttings of Magnolia grandiflora L.
Timing and Hormones Affected Rooting of Stem Cuttings of Magnolia grandiflora L.
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Magnolia grandiflora L。 (southern magnolia) is an evergreen tree native to the southeastern US。 It is a popular and important landscape plant and shade tree because of its glossy green leaves and large white fragrant flowers。 So far its clonal propagation has mainly relied on grafting and rooting of stem cuttings has rarely been reported although it has been introduced and cultivated for more than one hundred years in China。 To meet the increasing of market demands on the clonal reproduction， we carried out the stem cutting propagation in March， June， August and November 2007 from 5—8-year-old plants and treated with various concentrations of IBA and NAA。 Magnolia grandiflora could be vegetatively propagated by stem cuttings。 Timing played a vital role on the rooting of southern magnolia and the cuttings collected in November produced 70。8% of rooting。 Cuttings collected in June rooted up to 40。6% and only less than 21。9% of rooting was observed from the cuttings collected in March and August。 Rooting hormones significantly affected the rooting of southern magnolia and the highest rooting rate， 70。8%， was obtained under the treatment of KIBA at 20 g/L。 K-IBA concentrations at 10 g/L yielded 60。4% rooting rate。 Both higher (40 g/L) K-IBA concentrations reduced the rooting。 The rooting percentage of K-NAA at 5， 10， and 20 g/L were 58。3%， 50%， and 60。4%， respectively。 Magnolia grandiflora could be regenerated from stem cuttings and the better time to collect the cutting should be November。 Both K-IBA and K-NAA could increase its rooting rates and the recommended concentrations should be 10-20 g/L for K-IBA and 5—20 g/L for KNAA。 Researchers and growers should focus on the selection of new southern magnolia clones and propagate them by stem cuttings。
College of Forestry Central South University of Forestry and Technology, Changsha, Hunan 410004, China
College of Forestry Central South University of Forestry and Technology, Changsha, Hunan 410004, China Department of Plant, Soil and Environmental Sciences University of Maine, Orono, ME 04469, USA
Botanical Gardens, Central South University of Forestry and Technology, Changsha, Hunan 410004, China
International symposium on the family magnoliaceae
Guangzhou(CN)
Proceedings of the second international symposium on the family magnoliaceae
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