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Brian A. Krug, Brian E. Whipker, Ingram McCall, and John M. Dole

Three experiments were conducted to determine the effectiveness of plant growth regulators (PGRs) on `Tete a Tete', `Dutch Master', and `Sweetness' narcissus (Narcissus pseudonarcissus). Ethephon foliar sprays (500 to 2500 mg·L-1) and substrate drenches of flurprimidol and paclobutrazol (0.25 to 4 mg/pot a.i.) did not control height during greenhouse forcing of `Tete a Tete' at any concentration trialed. Stem stretch was controlled during postharvest evaluation with ethephon foliar sprays ≥1000 mg·L-1, flurprimidol substrate drenches ≥0.5 mg/pot a.i., and paclobutrazol substrate drenches of 4 mg/pot a.i. A second experiment investigated preplant bulb soaks of flurprimidol (10 to 40 mg·L-1) applied to `Dutch Master' and `Tete a Tete' narcissus bulbs. Flurprimidol preplant bulb soaks controlled postharvest stretch on `Tete a Tete' and `Dutch Master' at concentrations ≥15 and ≥10 mg·L-1, respectively. A third experiment was conducted with paclobutrazol (75 to 375 mg·L-1) on `Tete a Tete' and `Dutch Master' and three concentrations of flurprimidol on `Sweetness' to determine optimal soak recommendations. Paclobutrazol preplant bulb soaks ≥75 mg·L-1 controlled postharvest stretch of `Tete a Tete' and `Dutch Master', while 37.5 mg·L-1 of flurprimidol controlled postharvest stretch of `Sweetness'. Based on the results of these experiments, growers can now select a PGR to help control excessive plant growth.

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Diane M. Camberato, James J. Camberato, and Roberto G. Lopez

. Properties of the plant growth regulators used in the study as indicated on manufacturer label or material safety data sheet unless noted. Materials and Methods Initial carrier water characteristics. Because water is used as the carrier for the application of

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C. Yang, D.Y. Jiao, Z.Q. Cai, H.D. Gong, and G.Y. Li

plants in the wet season (WS) and treated with different plant growth regulators in the dry season. Different letters indicate significant differences at P < 0.05. ABA = abscisic acid; CK = control (water); GA 3 = gibberellic acid; Gs = gas stomatal

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Modeste Kan Kouassi, Jane Kahia, Christophe N’guessan Kouame, Mathias Gnion Tahi, and Edmond Kouablan Koffi

different cocoa genotypes react differently to different callus-inducing hormones ( Traore and Guiltinan, 2006 ). Plant growth regulators play a key role by intervening in the reactions that lead to a reorientation of the program of gene expression. This

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Diana R. Cochran and Amy Fulcher

phytotoxicity ( Meijón et al., 2009 ) and be perceived as digressing from sustainable production ( Lütken et al., 2012 ). Plant growth regulators have several modes of action, including branch inducing, chemical pinching (chemicals that suppress apical dominance

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Antonios E. Tsagkarakis, Michael E. Rogers, and Timothy M. Spann

systemic insecticides and the last treatment with contact insecticides was greater than 1 year before PGR treatment. Table 1. Active ingredient chemical name, trade name, manufacturer, and rate of plant growth regulators used to study the effects of

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Piyada Alisha Tantasawat, Atitaya Sorntip, and Paniti Pornbungkerd

December) 2013 and the Summer (March to April) 2014 seasons ( A ) temperature in Celsius degrees ( B ) relative humidity in percentage. Exogenous application of plant growth regulators. To evaluate growth, floral and yield-related traits, and yield

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Marisa Y. Thompson, Jennifer J. Randall, Dawn VanLeeuwen, and Richard J. Heerema

; Tombesi et al., 2011 ; Weinbaum et al., 2001 ; Wood, 1991 , 2011b ). Plant growth regulators applied to pecan shoots affect return bloom differently, depending on whether the shoots were nonfruiting or fruiting during the treatment year ( Thompson et al

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Amir Rezazadeh and Richard L. Harkess

. Table 1. Effects of plant growth regulators (PGR) on plant height, leaf dry weight, and leaf area of purple firespike plants pinched 2 weeks after potting to leave two to three nodes and treated with PGRs when new shoots were 3–5 cm. Leaf dry weight and

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Marco Volterrani, Nicola Grossi, Monica Gaetani, Lisa Caturegli, Aimila-Eleni Nikolopoulou, Filippo Lulli, and Simone Magni

seeding is routinely adopted for several field crops. Properly sized sprigs could fit precision seeding machinery thus with the potential of being planted at a defined depth and spacing. Plant growth regulators (PGRs) are known for their ability to modify