Open Access(169) Root Formation on Stem Cuttings of Yellow-flowered Cultivars of Magnolia Is Influenced by Time-after-budbreak and IBA
Author(s) -
J. N. Sharma,
Gary W. Knox,
Maria Ishida
Publication year - 2005
Publication title -
hortscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.518
H-Index - 90
eISSN - 2327-9834
pISSN - 0018-5345
DOI - 10.21273/hortsci.40.4.1001a
Subject(s) - cutting , cultivar , biology , horticulture , botany
We propagatedsixyellow-flowered cultivars of Magnolia vegetatively by applying 0, 8, 16, or 30 g·kg -1 indole-3-butyric acid (IBA) in talc to bases of terminal stem cuttings collected 5, 7, 9, or 11 weeks after budbreak. Mean rooting percentage increased from 12% (in the absence of IBA) to 34% (after applying 30 g·kg -1 IBA). Rooting percentage also increased with increasing basal caliper ( r 2 = 0.25; P < 0.0001) of a cutting. For each collection date, more cuttings of `Ivory Chalice' and `Yellow Lantern' developed roots than did other cultivars. When data were analyzed separately for selected cultivars, 63% rooting was observed among cuttings of `Ivory Chalice' collected 7 weeks after budbreak. Rooting percentage was higher (22%) among cuttings of `Hot Flash' collected 5 or 7 weeks after budbreak in comparison to later collection dates, but harvest date did not influence rooting, which ranged from 44% to 59%, among cuttings of `Yellow Lantern'. Collection of stem cuttings early in the growing season (5 weeks after budbreak) was beneficial (31% rooting) for inducing root formation among cuttings of `Golden Sun'. We conclude that `Ivory Chalice' and `Yellow Lantern' are promising choices for growers interested in clonal propagation of yellow-flowered cultivars of Magnolia . To maximize rooting, terminal cuttings should be collected within 5 to 11 weeks after budbreak and should be treated with 16 or 30 g·kg -1 IBA in talc. Early collection dates improved rooting frequencies among cuttings of other cultivars but these, particularly `Butterflies', remain variably recalcitrant and merit further study.