Valerie Mary Sponsel

Scopus Publications

Inhibition of Cysteine Proteases via Thiol-Michael Addition Explains the Anti-SARS-CoV-2 and Bioactive Properties of Arteannuin B
Kaitlyn Varela, Hadi D. Arman, Mitchel S. Berger, Valerie M. Sponsel, Chin-Hsing Annie Lin, Francis K. Yoshimoto
Journal of Natural Products, 2023
Artemisia annua is the plant that produces artemisinin, an endoperoxide-containing sesquiterpenoid used for the treatment of malaria. A. annua extracts, which contain other bioactive compounds, have been used to treat other diseases, including cancer and COVID-19, the disease caused by the virus SARS-CoV-2. In this study, a methyl ester derivative of arteannuin B was isolated when A. annua leaves were extracted with a 1:1 mixture of methanol and dichloromethane. This methyl ester was thought to be formed from the reaction between arteannuin B and the extracting solvent, which was supported by the fact that arteannuin B underwent 1,2-addition when it was dissolved in deuteromethanol. In contrast, in the presence of N-acetylcysteine methyl ester, a 1,4-addition (thiol-Michael reaction) occurred. Arteannuin B hindered the activity of the SARS CoV-2 main protease (nonstructural protein 5, NSP5), a cysteine protease, through time-dependent inhibition. The active site cysteine residue of NSP5 (cysteine-145) formed a covalent bond with arteannuin B as determined by mass spectrometry. In order to determine whether cysteine adduction by arteannuin B can inhibit the development of cancer cells, similar experiments were performed with caspase-8, the cysteine protease enzyme overexpressed in glioblastoma. Time-dependent inhibition and cysteine adduction assays suggested arteannuin B inhibits caspase-8 and adducts to the active site cysteine residue (cysteine-360), respectively. Overall, these results enhance our understanding of how A. annua possesses antiviral and cytotoxic activities.
Signal Achievements in Gibberellin Research: The Second Half-Century
Valerie M. Sponsel
Annual Plant Reviews the Gibberellins, 2016
Chapter 1 briefly recounts the discovery of gibberellins (GAs) as natural products of the fungus Gibberella fujikuroi in the early part of the twentieth century, and provides a historical overview of GA research from the late 1950s to the present day. It describes howbiosynthetic pathways toGAs inGibberella and higher plants were defined, and how stem length mutants of cereals and legumes were instrumental in establishing which GAs are biologically active and have hormonal function. The chapter presents an overview of the cereal aleurone system in which GA signalling was first studied, and describes how more recent use of Arabidopsis and rice led to the characterisation of a GA receptor (GID1) and downstream regulatory proteins (DELLAs). A number of DELLA-interacting proteins are described, illustrating how it is that GA-induced degradation of DELLAs facilitates downstream responses including cell elongation. Other ‘classical’ GA responses include germination and flowering in some species.
Plant Root Templated Irrigation
Mohsen Qasemi, Drew W. Johnson, Valerie M. Sponsel
Irrigation and Drainage, 2016
A new method is explored for subsurface irrigation where the plant root structure is used as the subsurface water distribution system. Plants are severed at the stem and the stem stump is attached to a pressurized water source such that water may permeate into surrounding soil through the existing buried root system. This pressurized root system serves as a well‐ distributed buried irrigation water source to the other nearby growing plants taking up water. The feasibility of using an existing root structure in this manner to supply water at rates necessary to satisfy other growing plants was determined by conducting laboratory water hydraulic conductance studies. Laboratory growth studies were used to directly test the proposed root templated irrigation (RTI) approach. Modelling simulations were also utilized to extend laboratory findings to other scenarios and compare expected water use efficiency benefits associated with this proposed irrigation method with surface irrigation (SI) and subsurface drip irrigation (SDI) practices. Irrigation study measurements showed that RTI provides more efficient water use as compared to SI. Modelling calculations were in qualitative agreement with the experimental studies, indicating that RTI yields improvement in root water uptake over the SI and also SDI unless SDI source spacing is narrow. Copyright © 2016 John Wiley & Sons, Ltd.
A Century of Gibberellin Research
Peter Hedden, Valerie Sponsel
Journal of Plant Growth Regulation, 2015
Gibberellin research has its origins in Japan in the 19th century, when a disease of rice was shown to be due to a fungal infection. The symptoms of the disease including overgrowth of the seedling and sterility were later shown to be due to secretions of the fungus Gibberella fujikuroi (now reclassified as Fusarium fujikuroi), from which the name gibberellin was derived for the active component. The profound effect of gibberellins on plant growth and development, particularly growth recovery in dwarf mutants and induction of bolting and flowering in some rosette species, prompted speculation that these fungal metabolites were endogenous plant growth regulators and this was confirmed by chemical characterisation in the late 1950s. Gibberellins are now known to be present in vascular plants, and some fungal and bacterial species. The biosynthesis of gibberellins in plants and the fungus has been largely resolved in terms of the pathways, enzymes, genes and their regulation. The proposal that gibberellins act in plants by removing growth limitation was confirmed by the demonstration that they induce the degradation of the growth-inhibiting DELLA proteins. The mechanism by which this is achieved was clarified by the identification of the gibberellin receptor from rice in 2005. Current research on gibberellin action is focussed particularly on the function of DELLA proteins as regulators of gene expression. This review traces the history of gibberellin research with emphasis on the early discoveries that enabled the more recent advances in this field.
Jake MacMillan (1924-2014)
Valerie Sponsel
Phytochemistry, 2015
Soil-strength enhancements from polymer-infused roots
Miguelangel Sauceda, Drew W. Johnson, Jie Huang, Sazzad Bin-Shafique, Valerie M. Sponsel, Mark Appleford
Journal of Geotechnical and Geoenvironmental Engineering, 2014
This research investigates the use of polymer-infused roots for soil-improvement applications. By infusing polymer through the easily accessible above-surface plant stems, polymer-infused roots can be created without subsurface excavations. Evaluation of this technique involves identifying the improvements from polymer-infused roots by measuring in situ shear strength of soil using a vane shear apparatus and by measuring the tensile strength using split-tension tests in the laboratory. Roots of Ruellia squarrosa and Artemisia annua plants were infused with a mixture of epoxy resin and polyoxyalkylamine blend hardener. Compared with noninfused roots, polymer-infused roots provided an additional 22 kPa (28%) of shear strength for elastic silt and an additional 13.1 kPa (25%) of shear strength for low-plasticity clay with a corresponding 13.6-kPa (55%) increase in tensile strength for the low-plasticity clay. Acid hydrolysis testing was performed to ascertain the potential durability of the polymer-i...
Durability of polymer infused roots used for soil stabilization
Miguelangel Sauceda, Drew W. Johnson, Jie Huang, Sazzad Bin-Shafique, Valerie M. Sponsel, Mark Appleford
Journal of Materials in Civil Engineering, 2014
Polymer-infused plant roots can be created without soil excavation by infusing polymer into the roots of plants through the easily accessible above-surface plant stems. Efficacy of this technique for use in soil stabilization applications involves assessing the durability of polymer-infused plant roots. Polymer content was determined for infused Artemisia annua plant roots. Durability of these polymer-infused roots was evaluated by mass loss resistance and strength loss resistance of acid-treated samples. Durability in the context of soil stabilization applications was determined by comparing the shear strength of aged samples. Polymer infusions improved the durability of the plant material. Infused plant stems incubated in acid for 15 weeks lost 29% mass, whereas noninfused stems lost 60% mass. Infused roots incubated in acid for 24 h retained a tensile strength of 25 MPa, whereas noninfused acid-treated roots had a tensile strength of 12 MPa. In comparison to plant roots that provided no enhance...
Strength enhancement of plant roots through polymer infusions
Karl W Eisenacher, Drew W Johnson, Mark Appleford, Valerie M Sponsel
Journal of Composite Materials, 2013
By infusing a thermoset epoxy polymer into the root system of a plant, we aim to create an in situ plant-polymer composite material of high tensile strength resistant to biodegradation and suitable for soil stabilization applications. Microscopy imaging, volume and mass measurements, thermogravimetric analysis, and tensile testing were conducted to characterize the effects of infusing polymer into the plant system. The polymer appears to travel predominantly through xylem vessels of the plant system during infusions. Maximum tensile strength and modulus of elasticity are increased by 107% and 92%, respectively, with a polymer content of 59% by mass after infusions were conducted.
Systematic identification of functional modules and cis-regulatory elements in Arabidopsis thaliana.
Jianhua Ruan, Joseph Perez, Brian Hernandez, Chengwei Lei, Garry Sunter, Valerie M Sponsel
BMC Bioinformatics, 2011
BACKGROUND: Several large-scale gene co-expression networks have been constructed successfully for predicting gene functional modules and cis-regulatory elements in Arabidopsis (Arabidopsis thaliana). However, these networks are usually constructed and analyzed in an ad hoc manner. In this study, we propose a completely parameter-free and systematic method for constructing gene co-expression networks and predicting functional modules as well as cis-regulatory elements. RESULTS: Our novel method consists of an automated network construction algorithm, a parameter-free procedure to predict functional modules, and a strategy for finding known cis-regulatory elements that is suitable for consensus scanning without prior knowledge of the allowed extent of degeneracy of the motif. We apply the method to study a large collection of gene expression microarray data in Arabidopsis. We estimate that our co-expression network has ~94% of accuracy, and has topological properties similar to other biological networks, such as being scale-free and having a high clustering coefficient. Remarkably, among the ~300 predicted modules whose sizes are at least 20, 88% have at least one significantly enriched functions, including a few extremely significant ones (ribosome, p < 1E-300, photosynthetic membrane, p < 1.3E-137, proteasome complex, p < 5.9E-126). In addition, we are able to predict cis-regulatory elements for 66.7% of the modules, and the association between the enriched cis-regulatory elements and the enriched functional terms can often be confirmed by the literature. Overall, our results are much more significant than those reported by several previous studies on similar data sets. Finally, we utilize the co-expression network to dissect the promoters of 19 Arabidopsis genes involved in the metabolism and signaling of the important plant hormone gibberellin, and achieved promising results that reveal interesting insight into the biosynthesis and signaling of gibberellin. CONCLUSIONS: The results show that our method is highly effective in finding functional modules from real microarray data. Our application on Arabidopsis leads to the discovery of the largest number of annotated Arabidopsis functional modules in the literature. Given the high statistical significance of functional enrichment and the agreement between cis-regulatory and functional annotations, we believe our Arabidopsis gene modules can be used to predict the functions of unknown genes in Arabidopsis, and to understand the regulatory mechanisms of many genes.
Gibberellin biosynthesis and inactivation
Valerie M. Sponsel, Peter Hedden
Plant Hormones Biosynthesis Signal Transduction Action, 2010
Systematic construction and analysis of co-expression networks for identification of functional modules and cis-regulatory elements
Proceedings of the ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, 2010
The major antennal chemosensory protein of red imported fire ant workers
D. González, Q. Zhao, C. McMahan, D. Velasquez, W. E. Haskins, V. Sponsel, A. Cassill, R. Renthal
Insect Molecular Biology, 2009
Expression of gibberellin 20-oxidase1 (AtGA20ox1) in Arabidopsis seedlings with altered auxin status is regulated at multiple levels
Isabel Desgagné-Penix, Valerie M. Sponsel
Journal of Experimental Botany, 2008
The auxin transport inhibitor response 3 (tir3) allele of BIG and auxin transport inhibitors affect the gibberellin status of Arabidopsis
Isabel Desgagné-Penix, Suntara Eakanunkul, Jeremy P. Coles, Andrew L. Phillips, Peter Hedden, Valerie M. Sponsel
Plant Journal, 2005
Erratum: The deoxyxylulose phosphate pathway for the biosynthesis of plastidic isoprenoids: Early days in our understanding of the early stages of gibberellin biosynthesis (Journal of Plant Growth Regulation (2002) 20:4 (332-345))
Valerie M. Sponsel
Journal of Plant Growth Regulation, 2002
The deoxyxylulose phosphate pathway for the biosynthesis of plastidic isoprenoids: Early days in our understanding of the early stages of gibberellin biosynthesis
Valerie M. Sponsel
Journal of Plant Growth Regulation, 2001
Characterization of new gibberellin-responsive semidwarf mutants of Arabidopsis
V. M. Sponsel, F. W. Schmidt, S. G. Porter, M. Nakayama, S. Kohlstruk, M. Estelle
Plant Physiology, 1997
The gibberellin status of lip1, a mutant of pea that exhibits light- independent photomorphogenesis
V. M. Sponsel, J. J. Ross, M. R. Reynolds, G. M. Symons, J. B. Reid
Plant Physiology, 1996
Future directions in plant hormone research
Michael H. Beale, Valerie M. Sponsel
Journal of Plant Growth Regulation, 1993
Expression of the le mutation in young ovaries of Pisum sativum and its effect on fruit development
C. M. Santes, P. Hedden, V. M. Sponsel, J. B. Reid, J. L. Garcia-Martinez
Plant Physiology, 1993
Use of an acylcyclohexanedione growth retardant, LAB 198 999, to determine whether gibberellin A20 has biological activity per se in dark-grown dwarf (le5839) seedlings of Pisum sativum
Valerie M. Sponsel, James B. Reid
Plant Physiology, 1992
Immunochromatographic purification of gibberellins from vegetative tissues of Cucumis sativus L: Separation and identification of 13-hydroxy and 13-deoxy gibberellins
V.A. Smith, V.M. Sponsel, C. Knatt, P. Gaskin, J. MacMillan
Planta, 1991
Gibberellins in shoots of Hordeum vulgare. A comparison between cv. Triumph and two dwarf mutants which differ in their response to gibberellin
Gillian M. Boolher, Michael D. Gale, Paul Gaskin, Jake MacMiilan, Valerie M. Sponsel
Physiologia Plantarum, 1991
Gibberellins in developing fruits of Pisum sativum cv. Alaska: Studies on their role in pod growth and seed development
J. L. Garcia-Martinez, V. M. Sponsel, P. Gaskin
Planta, 1987
Gibberellins in dark- and red-light-grown shoots of dwarf and tall cultivars of Pisum sativum: The quantification, metabolism and biological activity of gibberellins in Progress no. 9 and Alaska
V. M. Sponsel
Planta, 1986
Gibberellins in immature seeds and dark-grown shoots of Pisum sativum - Gibberellins identified in the tall cultivar Alaska in comparison with those in the dwarf Progress No. 9
Paul Gaskin, Sarah J. Gilmour, Jake MacMillan, Valerie M. Sponsel
Planta, 1985
Gibberellins in Pisum sativum—their nature, distribution and involvement in growth and development of the plant
Valerie M. Sponsel
Physiologia Plantarum, 1985
Identification and localization of gibberellins in maturing seeds of the cucurbit Sechium edule, and a comparison between this cucurbit and the legume Phaseolus coccineus
Kumyul S. Albone, Paul Gaskin, Jake MacMillan, Valerie M. Sponsel
Planta, 1984
Metabolism of gibberellins by immature barley grain
Sarah J. Gilmour, Paul Gaskin, Valerie M. Sponsel, Jake MacMillan
Planta, 1984
The localization, metabolism and biological activity of gibberellins in maturing and germinating seeds of Pisum sativum cv. Progress No. 9
Valerie M. Sponsel
Planta, 1983
Endogenous gibberellins and kauranoids identified from developing and germinating barley grain
Paul Gaskin, Sarah Jane Gilmour, John R. Lenton, Jake MacMillan, Valerie M. Sponsel
Journal of Plant Growth Regulation, 1983
The biological activity of sixteen gibberellin A4 and gibberellin A9 derivatives using seven bioassays
Gordon V. Hoad, Bernard O. Phinney, Valerie M. Sponsel, Jake Macmillan
Phytochemistry, 1981
Metabolism of [13C1]gibberellin A29 to [13C1]gibberellin-catabolite in maturing seeds of Pisum sativum cv. Progress No. 9
Valerie M. Sponsel, Jake MacMillan
Planta, 1980
The identification of gibberellins in immature seeds of Vicia faba, and some chemotaxonomic considerations
Valerie M. Sponsel, Paul Gaskin, Jake MacMillan
Planta, 1979
Metabolism of gibberellin A29 in seeds of Pisum sativum cv. Progress No. 9; Use of [2H] and [3H]GAs, and the identification of a new GA catabolite
Valerie M. Sponsel, Jake MacMillan
Planta, 1978
Further studies on the metabolism of gibberellins (GAs) A9, A20 and A29 in immature seeds of Pisum sativum cv. progress No. 9
Valerie M. Sponsel, J. MacMillan
Planta, 1977
Selected topics in gibberellin metabolism
JOHN R. BEARDER, VELERIE M. SPONSEL
Biochemical Society Transactions, 1977
The biological activities of some new gibberellins (GAs) in six plant bioassays
Valerie M. Sponsel, G. V. Hoad, L. J. Beeley
Planta, 1977
Metabolism of kaurenoids by Gibberella fujikuroi in the presence of the plant growth retardant, N,N,N-trimethyl-1-methyl-(2′,6′,6′-trimethylcyclohex-2′-en-1′-yl)prop-2-enylammonium iodide
Peter Hedden, Bernard O. Phinney, Jake MacMillan, Valerie M. Sponsel
Phytochemistry, 1977

RECENT SCHOLAR PUBLICATIONS

Signal achievements in gibberellin research: the second half‐century
VM Sponsel
Annual Plant Reviews, Volume 49: Gibberellins, The, 1-36 , 2016
2016
Citations: 41
Plant root templated irrigation
M Qasemi, DW Johnson, VM Sponsel
Irrigation and Drainage 65 (1), 38-48 , 2016
2016
Citations: 2
A century of gibberellin research
P Hedden, V Sponsel
Journal of plant growth regulation 34 (4), 740-760 , 2015
2015
Citations: 790
Jake MacMillan (1924-2014)
V Sponsel
Phytochemistry 115, 271-272 , 2015
2015
Durability of polymer infused roots used for soil stabilization
M Sauceda, DW Johnson, J Huang, S Bin-Shafique, VM Sponsel, ...
Journal of materials in civil engineering 26 (8), 04014043 , 2014
2014
Citations: 2
Soil-strength enhancements from polymer-infused roots
M Sauceda, DW Johnson, J Huang, S Bin-Shafique, VM Sponsel, ...
Journal of Geotechnical and Geoenvironmental Engineering 140 (2), 04013004 , 2014
2014
Citations: 26
B2. The Biosynthesis and Metabolism of
VM Sponsel
Plant Hormones: Physiology, Biochemistry and Molecular Biology 93, 66 , 2013
2013
TREVOR L. WANG
VM SPONSEL
The Pea Crop: A Basis for Improvement, 339 , 2013
2013
Strength enhancement of plant roots through polymer infusions
KW Eisenacher, DW Johnson, M Appleford, VM Sponsel
Journal of composite materials 47 (11), 1313-1326 , 2013
2013
Citations: 6
Systematic identification of functional modules and cis-regulatory elements in Arabidopsis thaliana
J Ruan, J Perez, B Hernandez, C Lei, G Sunter, VM Sponsel
BMC bioinformatics 12 (Suppl 12), S2 , 2011
2011
Citations: 15
Travel Funds for Junior Scientists to attend the International Plant Growth Substances Association Conference
VM Sponsel
NSF Award Number 1038329. Directorate for Biological Sciences 10 (1038329 … , 2010
2010
Systematic construction and analysis of co-expression networks for identification of functional modules and cis-regulatory elements
J Ruan, J Perez, B Hernandez, G Sunter, VM Sponsel
Proceedings of the 9th International Workshop on Data Mining in … , 2010
2010
Citations: 2
Plant hormones
VM Sponsel, P Hedden, PJ Davies
Springer , 2010
2010
Citations: 18
A combined biochemical, molecular and computational approach to understanding the regulation of gibberellin biosynthesis in Arabidopsis
VM Sponsel
NSF Award Number 0848135. Directorate for Biological Sciences 8 (848135), 48135 , 2009
2009
The major antennal chemosensory protein of red imported fire ant workers
D González, Q Zhao, C McMahan, D Velasquez, WE Haskins, V Sponsel, ...
Insect Molecular Biology 18 (3), 395-404 , 2009
2009
Citations: 91
Strategies for the analysis of biologically active compounds by capillary electrophoresis and microchip-capillary electrophoresis
CD Garcia, W Gorski, A Ayon, V Sponsel
2009
Expression of gibberellin 20-oxidase1 ( AtGA20ox1 ) in Arabidopsis seedlings with altered auxin status is regulated at multiple levels
I Desgagné-Penix, VM Sponsel
Journal of Experimental Botany 59 (8), 2057-2070 , 2008
2008
Citations: 56
IPGSA Conference-Travel funds for junior scientists to attend the International Plant Growth Substances Association Conference in Puerto Vallarta, Mexico on July 21-25, 2007.
VM Sponsel
NSF Award Number 0726565. Directorate for Biological Sciences 7 (726565), 26565 , 2007
2007
Effects of altered growth on the plant hormones auxin and gibberellin in Arabidopsis thaliana .
I Desgagné-Penix, V Sponsel
2006
The auxin transport inhibitor response 3 ( tir3 ) allele of BIG and auxin transport inhibitors affect the gibberellin status of Arabidopsis
I Desgagné‐Penix, S Eakanunkul, JP Coles, AL Phillips, P Hedden, ...
The Plant Journal 41 (2), 231-242 , 2005
2005
Citations: 55

MOST CITED SCHOLAR PUBLICATIONS

A century of gibberellin research
P Hedden, V Sponsel
Journal of plant growth regulation 34 (4), 740-760 , 2015
2015
Citations: 790
Gibberellin biosynthesis and inactivation
VM Sponsel, P Hedden
Plant hormones: biosynthesis, signal transduction, action!, 63-94 , 2004
2004
Citations: 299
Gibberellin biosynthesis and metabolism
VM Sponsel
Plant hormones and their role in plant growth and development, 43-75 , 1987
1987
Citations: 150
Qualitative and quantitative analyses of gibberellins throughout seed maturation in Pisum sativum cv. Progress No. 9
VM Frydman, P Gaskin, J & MacMillan
Planta 118 (2), 123-132 , 1974
1974
Citations: 136
The biosynthesis and metabolism of gibberellins in higher plants
VM Sponsel
Plant hormones: physiology, biochemistry and molecular biology, 66-97 , 1995
1995
Citations: 103
The major antennal chemosensory protein of red imported fire ant workers
D González, Q Zhao, C McMahan, D Velasquez, WE Haskins, V Sponsel, ...
Insect Molecular Biology 18 (3), 395-404 , 2009
2009
Citations: 91
The localization, metabolism and biological activity of gibberellins in maturing and germinating seeds of Pisum sativum cv. Progress No. 9
VM Sponsel
Planta 159 (5), 454-468 , 1983
1983
Citations: 87
General aspects of phase change, with special reference to Hedera helix L.
PF Wareing, VM Frydman
Symposium on juvenility in woody perennials. Acta Hort 56, 57-69 , 1976
1976
Citations: 82
Metabolism of gibberellin A 29 in seeds of Pisum sativum cv. Progress No. 9; Use of [ 2 H] and [ 3 H]GAs, and the identification of a new GA catabolite
VM Sponsel, J MacMillan
Planta 144 (1), 69-78 , 1978
1978
Citations: 77
Gibberellins in developing fruits of Pisum sativum cv. Alaska: Studies on their role in pod growth and seed development
JL García-Martínez, VM Sponsel, P Gaskin
Planta 170 (1), 130-137 , 1987
1987
Citations: 75
Gibberellins in dark- and red-light-grown shoots of dwarf and tall cultivars of Pisum sativum : The quantification, metabolism and biological activity of gibberellins in …
VM Sponsel
Planta 168 (1), 119-129 , 1986
1986
Citations: 74
Endogenous gibberellins and kauranoids identified from developing and germinating barley grain
P Gaskin, SJ Gilmour, JR Lenton, J MacMillan, VM Sponsel
Journal of Plant Growth Regulation 2 (1), 229-242 , 1983
1983
Citations: 72
Further studies on the metabolism of gibberellins (GAs) A 9 , A 20 and A 29 in immature seeds of Pisum sativum cv. progress No. 9
VM Sponsel, J MacMillan
Planta 135 (2), 129-136 , 1977
1977
Citations: 71
The metabolism of gibberellins A9, A20 and A29 in immature seeds of Pisum sativum cv. Progress No. 9
VM Frydman, J & MacMillan
Planta 125 (2), 181-195 , 1975
1975
Citations: 71
Phase Change in Hedera helix L I. GIBBERELLIN-LIKE SUBSTANCES IN THE TWO GROWTH PHASES
VM Frydman, PF Wareing
J. Experimental Botany 24 (6), 1131-1138 , 1973
1973
Citations: 66
Identification and localization of gibberellins in maturing seeds of the cucurbit Sechium edule, and a comparison between this cucurbit and the legume Phaseolus coccineus
KS Albone, P Gaskin, J MacMillan, VM Sponsel
Planta 162 (6), 560-565 , 1984
1984
Citations: 65
Gibberellins in immature seeds and dark-grown shoots of Pisum sativum Gibberellins identified in the tall cultivar Alaska in comparison with those in the dwarf …
P Gaskin, SJ Gilmour, J MacMillan, VM Sponsel
Planta 163 (2), 283-289 , 1985
1985
Citations: 59
Expression of gibberellin 20-oxidase1 ( AtGA20ox1 ) in Arabidopsis seedlings with altered auxin status is regulated at multiple levels
I Desgagné-Penix, VM Sponsel
Journal of Experimental Botany 59 (8), 2057-2070 , 2008
2008
Citations: 56
Phase change in Hedera helix L. III. The effects of gibberellins, abscisic acid and growth retardants on juvenile and adult ivy
VM Frydman, PF Wareing
J. Experimental Botany 25, 420-429 , 1974
1974
Citations: 56
The auxin transport inhibitor response 3 ( tir3 ) allele of BIG and auxin transport inhibitors affect the gibberellin status of Arabidopsis
I Desgagné‐Penix, S Eakanunkul, JP Coles, AL Phillips, P Hedden, ...
The Plant Journal 41 (2), 231-242 , 2005
2005
Citations: 55