Table of Contents

Meeting Participants...................................................................................................................... vi

Steering Committee...................................................................................................................... xiii

Sustaining Members.................................................................................................................... xiv

Honorary Lifetime Members....................................................................................................... xv

Author Index................................................................................................................................. xvi

From the President...................................................................................................................... xvii

Photo Summary........................................................................................................................... xviii

SYMPOSIUM I:

TRENDS AND USES OF PGRS IN ORNAMENTALS AND GREENHOUSES

Trends and Uses of Plant Growth Regulators on Herbaceous Perennials

Dr. Joyce Latimer............................................................................................................................ 1

Plant Growth Regulators in Floriculture: Bulb Crops

Brian A. Krug and Brian E. Whipker............................................................................................... 5

SESSION I

Chemical Regulation of Timing and Synchrony of Bud Break and Flowering in Different Wood Types of Apple

S. McArtney*, J. Palmer, R. Diack and S. Ward.............................................................................. 8

Comparison of Multiple Rates of Apogee^® and Palisade^® for ‘Cheyenne’ Bermudagrass Seed Production

M. D. Rethwisch*, R. Perez and M. Reay......................................................................................... 9

Development of New Alternative Methods for Plant Growth Regulation in Europe

C.W. Hansen* and K. K. Petersen................................................................................................. 13

Effects of Plant Growth Regulators on the Severity of Powdery Mildew on Phlox paniculata ‘Blue Boy’ and Rudbeckia hirta ‘Indian Summer’

S. Hill* and J. Latimer................................................................................................................... 15

*Corresponding author.

SYMPOSIUM II:

WATER RELATIONS, PGRs AND PLANT GROWTH

Can We Deliver Enhanced Water Use Efficiency, Sustain Yields and Enhance Yield

Qualities by Exploiting Root-To Shoot Signalling Mechanisms in Crop Plants?

M.A.Bacon*, W.J. Davies, I.C. Dodd and D. Mingo...................................................................... 16

Expansins and Their Roles in Regulating Plant Growth

Y. Wu.............................................................................................................................................. 21

Translating Changes in Water Status Into Commercial Benefit: A Review to Stimulate Discussion

E. W. Stover* and J.P. Syvertsen.................................................................................................. 22

SESSION II

Mepiquat Pentaborate For Use in Cotton Cultivation

John S. Harden*, Richard R. Evans, R. Kober and W. Rademacher............................................. 24

Trinexapac-Ethyl, Plant Population, Nitrogen Fertility, and Crop Production

in Drill-Seeded Rice

R.T. Dunand................................................................................................................................... 25

Effect of Growth Regulators on Yield and Fiber Quality and Quantity

In Flax (Linum usitatissimum L.)

Tomas Ayala-Silva*, D. E. Akin, Jonn Foulk and Roy B. Dodd.................................................... 26

SYMPOSIUM III:

HORMONE DELIVERY SYSTEMS

The New Generation Bioreactors, PGR's and Plant Organ Development

Jeffrey W. Adelberg....................................................................................................................... 28

Early Control of Seedling Growth by Treating Seeds with Growth Regulators

S. Magnitskiy*, C. Pasian, M. Bennett and J. Metzger................................................................. 29

The Embryo MADS-Domain Protein AGL15 Directly Regulates Expression

of a Gene Encoding a Gibberellin 2-Oxidase

H. Wang, L.V. Caruso, A.B. Downie and S.E. Perry*................................................................... 36

Effects of a Range of Gibberellin Structures on Growth of Pisum sativum

Genotypes Differing in Shoot Architecture

S. Maki*, H. Mullen, R. Pharis and S. Singer................................................................................ 39

SESSION III

Interaction of Compounds with the Ethylene Receptor: How and Why They Act?

Edward C. Sisler............................................................................................................................ 41

Evidence of Growth Stimulation by Low Concentration of Gibberellin Synthesis Inhibitors

W.R. Chaney* and S. Bai............................................................................................................... 44

Sensitivity of Radish to Volatile Organic Compounds: Toluene, Ethanol, and Acetone

G.W. Stutte*, I. Eraso and, S. Anderson....................................................................................... 55

Fortified Ascophyllum Marine Plant Extracts Improve Yield and Quality

of Tomatoes and Peppers

R. Garcia, A. Carrillo and J. Norrie*............................................................................................ 57

SYMPOSIUM IV:

TREE ARCHITECTURE

Cytokinins and Auxin Distribution in the Conifer Tree Crown

H. N. Rasmussen*, B. Veierskov, R. Nørbæk and J. Hansen-Møller............................................. 58

A Simple Mathematical Model to Investigate Shoot:Root Partitioning in

Response to Light and Nitrogen

S. Cameron.................................................................................................................................... 67

Characteristics and Management of Peach and Apple Tree Crowns

T. Tworkoski.................................................................................................................................. 69

Crown Management in Conifer Seed Orchards

Ron Smith....................................................................................................................................... 71

SESSION IV

Rootstock and Shoot Preformation in Pistachio and Their Influence on

Canopy Architecture and Yield Components

T. Spann*, R. Beede, S. Weinbaum and T. DeJong........................................................................ 76

Long Distance Nitrogen Signaling Via Cytokinin in Poplar

M. Cline*, M. Thangavelu and K. Dong-Il.................................................................................... 78

Prohexadione-CA and Crop Protection in Pome Fruit Trees

W. Rademacher.............................................................................................................................. 79

Response of Six Citrus Genotypes to Prohexadione-CA

E. Stover*, S.M. Ciliento and M.E. Myers..................................................................................... 86

Parthenolide and Abscisic Acid Synthesis in Feverfew are Connected

J.M. Fonseca*, J.W. Rushing, N.C. Rajapakse, R.L. Thomas

and M.B. Riley................................................................................................................................ 87

CONTRIBUTED PAPERS:

Comparing Paclobutrazols

Brian E. Whipker* and Ingram McCall......................................................................................... 88

Flurprimidol Foliar Sprays Control Growth of Fall Pansies

Brian E. Whipker*, Ingram McCall, James L. Gibson, Todd J. Cavins and Michelle Bell........... 96

Potential Additive Growth Regulator Effects of Triazole Fungicides on

Bedding Plants Treated with Growth Regulators

Thomas J. Banko......................................................................................................................... 100

Gibberellic Acid and Sucrose Delay Senescence of Cut Lupinus densiflorus Benth Flowers

W. A. Mackay*, N. Sankhla, and T.D. Davis............................................................................... 104

Standing Cypress: A Potential New Specialty Cut Flower Crop

N. Sankhla, W. A. Mackay*, C. B. McKenney and T. D. Davis................................................... 107

Evaluating Growth Characteristics and Total Anthocyanin Content In Three Cultivars of Red Romaine-Type Lettuce (Lactuca Sativa L.) in Response to Three Lighting Intensities

J.T. Richards, N.C. Yorio*, S.L. Edney, C.E. Yunker and G.W. Stutte........................................ 110

Effects of Gibberellic Acid, Acetylthiproline, and a Mixture of Amino Acids + Short-Chain Peptides on Scallion Yield

J. Pablo Morales-Payan* and W.M. Stall.................................................................................... 115

Effects of Pruning on Auxin and Cytokinin Levels and Subsequent Shoot

Regrowth Among Different Habits of Peach

T. Tworkoski*, S. Miller and R. Scorza....................................................................................... 119

Effectiveness of Retain® on Pistillate Flower Abortion and Ethylene Production

of Walnut Flowers

H. Johnson* and V.S. Polito........................................................................................................ 120

Effect of Deficit Irrigation on Yield and Vegetative Growth in English Walnuts

C. Little*, K. Shackel, B. Lampinen, A. Fulton, R. Buchner,

J. Grant, T, Prichard, L. Schwankl............................................................................................. 121

Protein Expression of Forced Softwood Growth in Relation to

Plant Growth Regulators in Forcing Solution

Guochen Yang* and Paul E. Read............................................................................................... 123

Promoting Effects of Mepiquat Chloride on Lateral Root Initiation of Cotton Seedlings

Sh. Duan*, Zh.H. Li, Y. X.L. Tian, Zh.X. Zhai and Zh.P. He....................................................... 130

SESSION IV

Effect of Cytokinins on Yield of Iceberg Lettuce

Jorge M. Fonseca........................................................................................................................ 136

Delayed Ripening of ‘Bartlette’ Pears Using Postharvest Dips of

Aminoethoxyvinylglycine (Avg)

E.A. Curry.................................................................................................................................... 137

Effect of Retain^â on Reducing Pistillate Flower Abortion (PFA) in Serr Walnut

Using Speed Sprayer Application

R.H. Beede.................................................................................................................................... 138