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Sarah A. White, Holly L. Scoggins, Richard P. Marini and Joyce G. Latimer

fulfillment of the requirements for the MS degree. The authors gratefully acknowledge the technical assistance of Velva Groover. Plant material generously provided by Yoder Green Leaf, Lancaster, Pa. Multivariate repeated measures analysis of plant growth

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Patrick E. McCullough, Haibo Liu, Lambert B. McCarty and Ted Whitwell

Dwarf bermudagrass morphological characteristics following the use of plant growth regulators have not been reported. The objective of this greenhouse study was to determine short-term effects of seven plant growth regulators on clipping yield, chlorophyll concentration, and root mass of `TifEagle' bermudagrass. Growth regulators tested included ethephon, fenarimol, flurprimidol, maleic hydrazide, mefluidide, paclobutrazol, and trinexapac-ethyl. Two applications of each compound were made over a 6-week period. Root mass was reduced 39% by fenarimol and 43% by flurprimidol, while other PGRs had root mass similar to untreated turf. `TifEagle' bermudagrass treated with paclobutrazol, mefluidide, fenarimol, and flurprimidol averaged 45% less root mass than trinexapac-ethyl-treated turf. Trinexapac-ethyl was the only compound to reduce clippings and enhance turf quality without negative rooting effects. Chemical names used: [4-(cyclopropyl-[α]-hydroxymethylene)-3,5-dioxo-cyclohexane carboxylic acid ethyl ester] (trinexapac-ethyl); {α-(1-methylethyl)-α-[4-(trifluoro-methoxy) phenyl] 5-pyrimidine-methanol} (flurprimidol); (+/-)-(R*,R*)-β-[(4-chlorophenyl) methyl]-α-(1, 1-dimethyl)-1H-1,2,4,-triazole-1-ethanol (paclobutrazol); (N-[2,4-dimethyl-5 [[(trifluoro-methyl)-sulfonyl] amino]phenyl]acetamide) (mefluidide); [1,2-dihydro-3,6-pyridazine-dione] (maleic hydrazide); [(2-chloroethyl)phosphonic acid] (ethephon); and (2-(2-chlorophenyl)-2-(4-chlorophenyl)-5-pyrimidinemethanol) (fenarimol).

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Shi-Ying Wang

76 ORAL SESSION 13 (Abstr. 478-483) Floriculture: Postharvest Physiology/Plant Growth Regulators

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Helen E. Hammond, Richard K. Schoellhorn, Sandra B. Wilson and Jeffrey G. Norcini

cumbersome size for handling and shipping. Applications of plant growth regulators (PGRs) may help to extend the amount of time these plants can be held before distribution and sale, to improve visual quality, and to facilitate shipping. There are many PGRs

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Craig A. Campbell

142 WORKSHOP 19 (Abstr. 688-690) Opportunities and Challenges in the Development and Registration of Plant Growth Regulators Wednesday, 26 July, 10:00 a.m.-12:00 noon

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Pascal Nzokou and Paligwende Nikiema

creates a challenge for researchers to develop treatments or approaches that will improve tree resistance to frost damage in case of warm winter temperatures. One potential solution is the use of plant growth regulators (PGRs) to influence the natural

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Sean J. Markovic and James E. Klett

expense ( Holland et al., 2007 ). Applying plant growth regulators, on the other hand, is generally less labor intensive than manual pruning, although there is a chance it can cause phytotoxicity in certain crops ( Meijón et al., 2009 ). Three specific

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D.W. Williams and P.B. Burrus

1 Assistant Professor. 2 Research Specialist. We gratefully acknowledge partial funding of this project by the United States Golf Association and the Kentucky Turfgrass Council. Discussions of herbicides and plant growth regulators imply no

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Nan Tang, Xiuting Ju, Yafan Hu, Rulong Jia and Daocheng Tang

; Finkelstein, 2010 ; Khan et al., 2007 ; Prat, 2010 ; Woodger et al., 2010 ; Xu et al., 2007 ). Plant growth regulators have been widely used in the vegetative propagation of bulbous ornamentals ( Gaspar et al., 1996 ; Hanks and Rees, 1977 ; Kawa

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Khalid M. Elhindi, Yaser Hassan Dewir, Abdul-Wasea Asrar, Eslam Abdel-Salam, Ahmed Sharaf El-Din and Mohamed Ali

dormancy, various methods like scarification, pretreatment with plant growth regulators (PGRs), and temperature shocks are used to break dormancy ( Copeland and McDonald 2001 ; Hidayati et al., 2012 ). Plant seed germination depends on both intrinsic and