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Justin A. Schulze, Ryan N. Contreras, and Carolyn F. Scagel

( Huang et al., 2015 ; Kermani et al., 2003 ; Li et al., 1996 ; Ulrich and Ewald, 2014 ), we have found none that addressed adventitious rooting of stem cuttings. Successful vegetative propagation is an important consideration in determining plant

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Marianela Ramirez, Marek J. Krasowski, and Judy A. Loo

susceptible trees giving an indication of genetic resistance ( Ramirez, 2005 ). If genetic resistance exists in natural populations, restoration of disease-free beech in North American forests may be possible through vegetative propagation of resistant trees

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Andrew R. King, Michael A. Arnold, Douglas F. Welsh, and W. Todd Watson

; Pezeshki and DeLaune, 1994 ). Grafting is a reliable but more expensive method of propagating baldcypress ( Dirr, 2009 ; Thomsen, 1978 ). Alternatively, vegetative propagation by cuttings yields uniform plants and through selection can be used to expedite

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Xiao-Juan Wei, Xiao-Jing Liang, Jin-Lin Ma, Kai-Xiang Li, and Haiying Liang

collection, Camellia ‘Maozi’ has the potential to be developed as both a landscaping and a high-end indoor potted plant. However, as an interspecific hybrid, Camellia ‘Maozi’ is sterile. As a result, vegetative propagation is a major approach for the

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Nathalie Nivot, Alain Olivier, and Line Lapointe

Baskin, 1998 ; Luna, 2001 ). On the other hand, vegetative propagation could lead to mature individuals after a single year of cultivation. Several methods for the vegetative propagation of Trillium spp. have been described, all being based on the

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Huan Hu, Nan Chai, Haoxiang Zhu, Rui Li, Renwei Huang, Xia Wang, Daofeng Liu, Mingyang Li, Xingrong Song, and Shunzhao Sui

requirements. Wintersweet is mainly propagated by seeding and stem cutting, with a period of 2 to 3 years from seed sowing to flowering ( Chen and Chen, 2010 ). As the most economical vegetative propagation method, cutting can obtain large-scale saplings that

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Zhaohui Li, Yan Ma, Wanyuan Yin, Dekui Zang, and Xianfeng Guo

.V.M. Nyomora, A.S. Kanyeka, Z.L. 2010 Vegetative propagation of African Blackwood ( Dalbergia melanoxylon Guill. & Perr.): Effects of age of donor plant, IBA treatment and cutting position on rooting ability of stem cuttings New For. 39 183 194 An, G.C. Zhang

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Susan S. Han and Jennifer Nobel

The study was conducted to determine if ethylene or ethephon, an ethylene-releasing compound, can be used to induce abscission of phylloclades of four cultivars of Easter cactus [Rhipsalidopsis gaertneri (Regel) Moran] to increase efficiency in vegetative propagation. Abscission occurred within 24 hours after commencement of the ethylene treatments. Phytotoxicity, as exhibited by water soaking, transparency, and darkening of the phylloclades, as well as percent abscission, increased with increasing concentrations of ethephon (0 to 10,000 μl·liter–1). Ethylene released from ethephon, not the acidity of the solution, was determined to be the cause of the phytotoxicity. In three out of the four cultivars, vegetative and root growth from propagated phylloclades was significantly restricted by treatments with ethephon. In comparison, vegetative growth from phylloclades treated with ethylene at 20 μl·liter–1 was the same as from those treated with air. Root growth of the ethylene-treated phylloclades was not studied. The acidity of the ethephon solutions likely affected the growing regions, resulting in a reduction in growth. The study shows that treatment with ethylene gas or the use of pH-adjusted ethephon solutions may be an alternative to the labor-intensive procedures associated with vegetative propagation of Easter cactus. Chemical name used: 2-chloroethylphosphonic acid (ethephon).

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Dale E. Kester and Ale E. Kester

The term “clone” is a key biological term that designates a number of horticultural situations. In breeding, many cultivars are designated as clones, originating from consecutive vegetative propagation from individuals within a seedling population, from individual plants of a clone exhibiting “bud mutations,” and, more recently, from genetic engineering and biotechnology. Extensive vegetative propagation of a limited numbers of clones in modern horticultural systems has been accompanied by systemic incorporation by serious pathogens (viruses, viroids, phytoplasmas, etc.), and in some cases by horticultural deterioration (e.g., noninfectious bud-failure in almonds). Control of these problems in clonal propagation is achieved by 1) propagation source selection 2) maintenance of the source in a registered foundation block under protected conditions and 3)multipli-cation in controlled “mother blocks” or “increase blocks” from which commercial material is distributed after a minimum of consecutive generations of vegetative propagation. This system is the basis for Registration and Certification programs and “clean stock” in general. In many crops the selected propagation source is a single plant, its progeny constitutes a “clone,” and the new entity is given a unique name or number. To distinguish this “new” clone from the “original” clone, the designation of FOUNDATION CLONE is suggested. Biological and horticultural significance is illustrated in almond (Prunus dulcis).

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Paula M. Pijut and Melanie J. Moore

Juglans cinerea L. (butternut) is a hardwood species valued for its wood and edible nuts. Information on the vegetative propagation of this species is currently unavailable. Our objective was to determine the conditions necessary for successful stem-cutting propagation of butternut. In 1999 and 2000, 10 trees (each year) were randomly selected from a 5- and 6-year-old butternut plantation located in Rosemount, Minn. Hardwood stem cuttings were collected in March, April, and May. Softwood cuttings were collected in June and July. K-IBA at 0, 29, or 62 mm in water and IBA at 0, 34, or 74 mm in 70% ethanol were tested for root induction on cuttings. The basal end of cuttings were dipped in a treatment solution for 10 to 15 seconds, potted in a peat: perlite mixture, and placed in a mist bed for 5 to 8 weeks. Rooted cuttings were gradually hardened off from the mist bed, allowed to initiate new growth, over-wintered in a controlled cold-storage environment, and then outplanted to the field. For hardwood cuttings, rooting was greatest for those taken in mid-May (branches flushed out), 22% with 62 mm K-IBA and 28% with 74 mm IBA. Softwood cuttings rooted best when taken in June (current season's first flush of new growth or softwood growth 40 cm or greater) and treated with 62 mm K-IBA (77%) or 74 mm IBA (88%). For 1999, 31 out of 51 rooted softwood cuttings (60.8%) survived overwintering in cold storage and acclimatization to the field. For 2000, 173 out of 186 rooted softwood cuttings (93%) survived overwintering and acclimatization to the field. Chemical names used: indole-3-butyric acid-potassium salt (K-IBA); indole-3-butyric acid (IBA).