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George J. Wulster and Thomas J. Gianfagna

Growth and flowering of Freesia hybrida Bailey for the container-plant market can be controlled chemically using growth retardants and environmentally by cold storage of corms at 5C for 2 to 6 weeks before planting. Corms stored at 5C for 4 weeks flowered 20 days earlier than corms not stored at 5C. Preplant 5C storage of corms also reduced leaf and flower height. An ancymidol soil drench (3 mg) reduced leaf height and flower height by more than 50% and delayed flowering by 9 days. Combining growth regulator application with cold storage of corms produced the greatest reduction in leaf height and flower height. Moreover, plants flowered earlier than controls when corms were stored for at least 4 weeks, regardless of growth regulator treatment. Chemical name used: α-cyclopropyl-α- (4-methoxyphenyl) -5-pyrimidine methanol (ancymidol).

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Janet C. Cole, Robert O. Brown, and Mark E. Payton

Ancymidol and uniconazole are plant growth regulators that slow plant growth by inhibiting sterol and gibberellin biosynthesis ( Henry, 1985 ; Shive and Sisler, 1976 ). These growth regulators have been shown to restrict height of several

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Iftikhar Ahmad, Brian E. Whipker, and John M. Dole

. ( Pinto et al., 2006 ), Mussaenda L. ( Cramer and Bridgen, 1998 ), and lavender ( Lavandula stoechas L.) ( Papageorgiou et al., 2002 ). Paclobutrazol and ancymidol are closely related nitrogen-containing heterocentric compounds that act on the same

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Eucario Mancilla-Álvarez, Marco A. Ramírez-Mosqueda, Samantha Arano-Avalos, Rosalía Núñez-Pastrana, and Jericó J. Bello-Bello

retardants such as ancymidol ( El-Dawayati et al, 2012 ; Sarkar et al., 2001 ), and osmoregulators as polyethylene glycol (PEG-800) ( Seesangboon et al., 2018 ). In plant physiology, ancymidol produces a number of effects, including the inhibition of

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Christopher J. Currey, Diane M. Camberato, Ariana P. Torres, and Roberto G. Lopez

university tests and producer experience ( Evans, 2008 ). On 10 Mar. 2009, a single 2.5-fl oz drench was applied to each substrate. For calibrachoa, drenches were solutions containing deionized water (control), 1.0 or 2.0 ppm ancymidol (Abide; Fine Americas

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Christopher J. Currey, Kellie J. Walters, and Kenneth G. McCabe

plants of each cultivar were provided with 2-fl oz aliquots of solutions containing deionized water or 0.5, 1, 2, or 4 mg·L −1 ancymidol (Abide; Fine Americas, Walnut Creek, CA), flurprimidol (Topflor; SePRO, Carmel, IN), paclobutrazol (Piccolo; Fine

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Amy L. Burton, Svoboda V. Pennisi, and Marc W. van Iersel

appropriate concentration, the growth control and related enhanced plant quality may be extended into the postharvest period. In the current study, drench applications of α-cyclopropyl-α-(4-methoxyphenyl)-5-pyrimidinemethanol (ancymidol) or α

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Victor Gaba, Chassia Elman, Abed A. Watad, and Dennis J. Gray

Cotyledonary explants of melon (Cucumis melo L. cv. Galia) regenerate primordia and buds in vitro induced by benzyladenine. The anti-gibberellin ancymidol can stimulate the rate of regeneration on melon explants in the presence of benzyladenine. Concentrations of benzyladenine plus ancymidol that are individually ineffective can act synergistically to stimulate regeneration. Gibberellic acid reduces the rate of regeneration induced by benzyladenine or benzyladenine plus ancymidol. Chemical names used: N-(phenylmethyl)-1H-purine-6-amine (benzyladenine); alpha-cyclopropyl-alpha-(4-methoxy-phenyl)-5-pyrimidine methanol (ancymidol).

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Jeffrey Adelberg, Maria Delgado, and Jeffrey Tomkins

(multiplication) to promote axillary branching and to break apical dominance. Plant growth regulators that inhibit gibberellin synthesis were useful in bioreactor culture to improve morphology and anatomy of several geophyte crops ( Ziv, 1992 ). Ancymidol (ANC

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James C. Sellmer, Craig R. Adkins, Ingram McCall, and Brian E. Whipker

Plant growth retardant (PGR) substrate drenches (in mg a.i per pot.) of ancymidol at 0.25, 0.5, 1, 2, or 4; paclobutrazol at 1, 2, 4, 8, or 16; and uniconazole at 0.25, 0.5, 1, 2, or 4 (28,350 mg = 1.0 oz) were applied to pampas grass (Cortaderia selloana). Control of height growth during greenhouse forcing and the residual effects on plant growth in the landscape were evaluated. During greenhouse forcing, plant height exhibited a quadratic dose response to paclobutrazol and uniconazole, while ancymidol treated plants exhibited a linear response to increasing dose. All rates of uniconazole resulted in plant heights which were 56% to 75% shorter than the nontreated control, whereas paclobutrazol and ancymidol treatments resulted in 6% to 64% and 5% to 29% shorter plants, respectively. Severe height retardation was evident with {XgtequalX}2 mg uniconazole. When the plants were transplanted and grown in the landscape (24 weeks after the PGR application), all plants treated with ancymidol, paclobutrazol, and {XltequalX}0.5 mg uniconazole exhibited heights similar to the nontreated control, suggesting no residual effects of the PGR for these treatments. Only plants treated with uniconazole at {XgtequalX}1 mg remained shorter than the nontreated control in the landscape. These results demonstrate that plant growth regulators can be effectively and economically applied in the greenhouse production of pampas grass.