We investigated the influence of cutting water potential (Ψcut) on rooting of juvenile hardwood (dormant) and softwood (succulent) stem cuttings of loblolly pine (Pinus taeda L.) propagated under varying substrate water potentials (Ψsub) and volumes of mist application. Mist treatment and Ψsub contributed to the Ψcut of unrooted stem cuttings. When Ψsub was held constant across mist treatments, mist treatment contributed strongly to Ψcut. Substrate water potential affected rooting percentage when mist treatment was sub-optimal or excessive, otherwise mist treatment had a stronger effect than Ψsub 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.
Keywords: adventitious rooting; clonal forestry; Pinus taeda; vegetative propagation; soil water deficit; water relations; water stress
Journal Article. 0 words.
Subjects: Plant Sciences and Forestry
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