title: Mist, substrate water potential and cutting water potential influence rooting of stem cuttings of loblolly pine.
abstract: We investigated the influence of cutting water potential (Psicut) on rooting of juvenile hardwood (dormant) and softwood (succulent) stem cuttings of loblolly pine (Pinus taeda L.) propagated under varying substrate water potentials (Psisub) and volumes of mist application. Mist treatment and Psisub contributed to the Psicut of unrooted stem cuttings. When Psisub was held constant across mist treatments, mist treatment contributed strongly to Psicut. Substrate water potential affected rooting percentage when mist treatment was sub-optimal or excessive, otherwise mist treatment had a stronger effect than Psisub on rooting percentage. Cuttings rooted best when subjected to moderate cutting water potentials (-0.5 to -1.2 MPa) during the initial 4 or 5 weeks of the rooting period. Cuttings experiencing either severe water deficit or no water deficit rooted poorly. We conclude that the rooting environment should impose a moderate water stress on loblolly pine stem cuttings to achieve optimum rooting.
authors.affiliation: Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609, USA.
authors.forename: Anthony V
authors.initials: AV
authors.lastname: Lebude
authors.forename: Barry
authors.initials: B
authors.lastname: Goldfarb
authors.forename: Frank A
authors.initials: FA
authors.lastname: Blazich
authors.forename: Farrell C
authors.initials: FC
authors.lastname: Wise
authors.forename: John
authors.initials: J
authors.lastname: Frampton
mesh_terms: D001272:Atmosphere; D028223:Pinus / Q000254:growth & development / Q000502:physiology*; D018517:Plant Roots / Q000254:growth & development*; D018547:Plant Stems / Q000502:physiology; D014197:Trees / Q000254:growth & development / Q000502:physiology*; D014867:Water
chemical_list: D014867:Water