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1
Johnson, Robert Jean. "Plant growth regulators : an alternative to frequent mowing /." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA232051.
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Thesis (M.S. in Management)--Naval Postgraduate School, June 1990.Thesis Advisor(s): Carrick, Pual M. "June 1990." Description based on signature page. DTIC Identifier(s): Plant growth regulators, growth indicators. Author(s) subject terms: Plant growth regulators, growth indicators. Includes bibliographical references (p. 39-40). Also available online.
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Nasim, Muhammad. "Response of rice plants to plant growth regulators under saline conditions." Thesis, University of Aberdeen, 2003. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU164162.
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Responses of rice to plant growth regulators on germination and seedling growth under NaCl salinity were studied to identify possible means of increasing salinity tolerance. Gibberellic acid (GA) promoted germination processes and a-amylase activity and increased plumule but reduced radicle growth after emergence. GA partitioned more metabolites towards the plumule than the radicle. Chlormequat (CCC) showed no beneficial effects and abscisic acid (ABA) inhibited germination under saline conditions. Overall there was no large difference in the performance of three rice varieties, BR29, IR8 and Pokkali in germination. Artificially aged seeds showed increased sensitivity to salinity and GA produced similar effects on germination of artificially aged rice seeds as on unaged seeds. Seed pre-treatment with GA was as effective in promoting germination under saline conditions as applying GA in the germination media. GA with low Ca promoted germination and plumule growth as well as radicle growth. GA increased plant height and fresh weight of seedlings under saline conditions, however it did not show a large positive effect on rice seedlings. CCC had no beneficial effects on rice seedlings. ABA showed possible beneficial effects on rice seedlings as it reduced Na+ uptake and increased K+ and Ca2+ uptake. GA in combination with ABA appeared to adapt rice plants better to saline conditions. GA in combination with low Ca also promoted rice growth under saline conditions.
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Soomro, M. H. "The effects of plant parasitic nematodes and plant growth regulators on root growth of graminacious plants." Thesis, University of Reading, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378682.
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Fuentes, Hector David. "Studies in the use of plant growth regulators on phytoremediation /." View thesis View thesis, 2001. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030505.150607/index.html.
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Thesis (Ph.D.) -- University of Western Sydney, Macarthur, 2001.A thesis presented to the University of Western Sydney, in partial fulfillment of the requirements for the degree of Doctor of Philosophy, December, 2001. Bibliography : leaves 163-173.
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McCoy, Mark Christopher. "The effects of phytohormones on growth and artemisinin production in hairy root cultures of artemisia annua l." Link to electronic thesis, 2003. http://www.wpi.edu/Pubs/ETD/Available/etd-0529103-162012/.
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Hay, Elizabeth Irene. "Somatic embryo development and phenotypic variation in an abscisic acid-independent line of Larix x eurolepis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0028/NQ32748.pdf.
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Huang, Shuai. "Using chemical genetics to discover regulators in plant immunity." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44065.
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Temple-Smith, Kay Elizabeth. "The mode of action of novel plant growth regulators." Thesis, University of Bristol, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317880.
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Norton, E. R., L. J. Clark, H. Borrego, and Bryan Ellsworth. "Evaluation of Two Plant Growth Regulators from LT Biosysn." College of Agriculture, University of Arizona (Tucson, AZ), 2005. http://hdl.handle.net/10150/198160.
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A single field study was conducted during the 2004 cotton growing season at the University of Arizona Safford Agricultural Center to evaluate the effect of two plant growth regulators (PGRs) manufactured by LT Biosyn Inc. on the growth, development, yield, and fiber quality of cotton grown in the southeastern region of the state. This test was designed as a follow up study to work that was performed in 2003 on a grower cooperator site that demonstrated positive lint yield responses to the use of one of the PGRs used in this project. This was an eight treatment test involving the application of two PGRs, HappyGroTM (HG) and MegaGroTM (MG). The two formulations are intended to have different effects on plant growth and development. The HG formulation is a kinetin based product designed to enhance cell division and differentiation. The MG formulation is designed to enhance root growth early in the season. Several treatment combinations were designed to investigate varying scenarios of application of these two products alone and in conjunction with each other. The test included a control and each treatment was replicated four times in a randomized complete block design. Plant measurements were collected throughout the season to look for differences in plant growth and development. Lint yield was estimated by harvesting the entire plot and weighing the seedcotton with a weigh wagon equipped with load cells. Sub samples were collected for fiber quality and percent lint determinations. Plant measurements revealed extremely high fruit retention levels throughout the entire season with end of season levels near 75%. This high fruit retention resulted in very low vigor. Under these conditions, while lint yield was extremely high for this region (1300-1600 lbs. lint per acre), no statistical differences were observed among treatments. Fiber quality measurements also revealed no significant differences.
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Oliver, J. F. "The effects of plant growth regulators and plant parasitic nematodes on cereal root growth." Thesis, University of Reading, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233539.
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Schmidt, Torrance Ray. "Manipulation of crop load with bioregulators to mitigate biennial bearing in apple." Online access for everyone, 2006. http://www.dissertations.wsu.edu/Thesis/Fall2006/t_schmidt_120706.pdf.
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Fuentes, Hector D., of Western Sydney Hawkesbury University, of Science Technology and Environment College, and of Science Food and Horticulture School. "Studies in the use of plant growth regulators on phytoremediation." THESIS_CSTE_SFH_Fuentes_H.xml, 2001. http://handle.uws.edu.au:8081/1959.7/112.
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Phytoremediation is a relatively new technology that uses plants for the clean up of contaminated soils.Its low cost, simplicity and environmentally friendly approach make this technology a viable option for remediation but the main drawback is that it must be considered as long term alternative given its slow speed. This work is the first to report the use of Plant Growth Regulators(PGR)to enhance the performance of phytoremediation so that less time is needed for remediation.Soil samples were taken from a heavy metal contaminated, abandoned mine site for plant growth trials. A clean soil was also analysed and used for reference.Trials were carried out by growing corn in the contaminated soils and using various concentrations of IBA and NAA together with soil amedments to see if these could increase the accumulation of Zn, Mn, Cu, Bb and Fe in corn. Several further tests were conducted and results noted.Doctor of Philosophy (PhD)
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Tickes, B., and M. J. Ottman. "Evaluation of Plant Growth Regulators on Wheat in Arizona, 1987." College of Agriculture, University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/200841.
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Plant growth regulators are applied to small grains to decrease lodging which can adversely affect crop growth and yield. Wheat is intensively managed in Arizona, and lodging can be a problem. Chlormequat and ethephon were applied at various rates and times in six studies in 1987 to evaluate their use on Arizona's semi -dwarf cultivars with respect to lodging plant height, yield components and grain yield The results indicated that growth regulators applied at the recommended rates and times may decrease plant height and decrease kernel weight. However, the influence of growth regulator treatments on tiller number, head number, kernel number, and grain yield was not demonstrated. The ambiguous results obtained suggest our efforts need to be directed toward documenting the extent of lodging in the state, studying the effects of lodging and predicting when lodging will occur.
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Attaha, Ali H. Mohamad. "Effects of some plant growth regulators on productivity of strawberries." Thesis, University of Manchester, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252892.
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Helps, I. M. "The synthesis of plant growth regulators via alkyne hexacarbonyldicobalt complexes." Thesis, University of Strathclyde, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381126.
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Sheridan, Norman P. "The interaction of plant growth regulators with cell membrane constituents." Thesis, Kingston University, 1986. http://eprints.kingston.ac.uk/20346/.
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The thesis describes the interaction of auxins with membrane fractions prepared from etiolated epicotyl tissue of ‘Pisum Sativum’ seedling. The interaction of auxins with phospholipids was also examined. Two classes of high affinity binding tissue sites were found in the growing region of the epicotyl tissue. Kinetic analysis of the data resulted in dissociation constant values of: K[sub]1=2.2x 10[sup]-7 M, n[sub]1=1.8x10[sup]-10 moles/g fresh wt; K[sub]2=11x10[sup]-7M, n[sub]2=3x10[sup]-10 moles/g fresh wt. These sites were not found in the non-growing region of the pea epicotyl suggesting that they may be involved in the growth process. From the competition studies reported here, it would appear that site 2 showed greater auxin specificity than site 1 and this could be considered a candidate as an auxin receptor. Sucrose gradient fractionation techniques were employed to further separate the two binding sites and it was shown that site 2 binding was associated with fractions rich in plasma membrane while site 1 was associated with the endoplasmic reticulum. Separation of the solubilized sites by gel permeation methods indicated an apparent molecular weight of 42,000 daltons. IAA was shown to complex with the polar head group region of phospholipids, in CDCl[sub]3, although the strength of the complex was rather low (Kd=1.9x10[sup]-2 Molal). The strength of binding was influenced by the polar head groups of the phospholipids, but did not appear to be affected by the fatty acyl chain length. The physiological significances of such interactions are discussed.
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Magnitskiy, Stanislav V. "Controlling seedling height by treating seeds with plant growth regulators." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1101741472.
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Thesis (Ph. D.)--Ohio State University, 2004.Title from first page of PDF file. Document formatted into pages; contains xix, 157 p.; also includes graphics. Includes bibliographical references (p. 147-157).
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Augustyn-Gradkowska, E. "Stereocontrolled synthesis of plant growth regulators, abscisic acid and xanthoxin." Thesis, London Metropolitan University, 1985. http://repository.londonmet.ac.uk/3314/.
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The project is concerned with the total synthesis of plant growth regulators related to abscisic acid (ABA). The biological activity of these plant growth regulators, ABA and Xanthoxin, and their derivatives is influenced by the stereochemistry of the double bond system in the side chain, the 2Z,4E-isomers being most potent.
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Feys, Bart Julienne Frans. "Towards positional cloning of COI1, an arabidopsis gene controlling the response to coronatine and methyl jasmonate." Thesis, University of East Anglia, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317974.
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Christensen, Cynthia Lehua Warnock. "The effect of plant growth regulators on the growth of Closterium moniliferum." PDXScholar, 1990. https://pdxscholar.library.pdx.edu/open_access_etds/3968.
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Physiologic responses to Gibberellic Acid (GA), I-Naphthalene Acetic Acid (NAA), Benzylaminopurine (BAP), and Abscisic Acid (ABA). suggest that Oosterium monilfferum has the ability to utilize these plant growth factors. The growth promoters NAA and GA both increased growth when added to the media. The cell division regulator BAP (a synthetic cytokinin). also had a promotive effect on growth. Abscisic acid was found to be inhibitive to growth.
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Guan, Ming. "Steroids in plant development : effects and possible role of brassinosteroids and estrogens." Thesis, University of Exeter, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328469.
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Bass, Peter R. "Purification of an enzyme involved in abscisic acid biosynthesis." Thesis, University of Nottingham, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385939.
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Castellaro, Simon John. "Aspects of the chemistry and biosynthesis of gibberellins." Thesis, University of Bristol, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329885.
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Sari, Ugur. "Pollen polymorphism in Magnoliaceae and conservation of plant male germline regulators." Thesis, University of Leicester, 2015. http://hdl.handle.net/2381/37923.
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In flowering plants twin sperm cells are produced by the male gametophyte to enable double fertilization, which is of vital importance for plant fertility. The process of male gametogenesis depends upon relatively poorly understood mechanisms of gamete cell production, but the male germline-specific R2R3 MYB transcription factor DUO1 is an essential factor in germ cell division and gamete differentiation in Arabidopsis. One major objective of the thesis was to assess the validity of Brewbaker’s evidence that Magnoliaceae possess exclusively bicellular pollen at anthesis. This analysis provided conclusive evidence of the coexistence of polymorphic (bicellular and tricellular) pollen in Magnoliaceae species. Further, the maturation of pollen under increased temperature regimes can significantly accelerate the rate of generative cell division in M. grandiflora. A second major aim was to identify sequence and functional conservation of DUO1 orthologs genes in angiosperms and bryophytes. This study provided further evidence that a supernumerary lysine residue in the DUO1 MYB domain is widely conserved and the sequences and expression of two DUO1 orthologs from moss (Physcomitrella patens) were validated. Arabidopsis, tomato and rice DUO1 orthologs were shown to transactivate Arabidopsis DUO1 target promoters. The expression of angiosperm DUO1 orthologs were able to complement the generative cell division and genetic transmission defects in duo1 mutants, demonstrating conservation of function of DUO1 orthologs in Arabidopsis. The final objective was to investigate the functional conservation of DAZ1/DAZ2–related proteins in other angiosperms. The AtDAZ1 orthologs from Brassica rapa (BrDAZ1) and tomato (SlDAZ1) were able to partially rescue the division and transmission defects of daz1/daz2 double mutant pollen, allowing daz1/daz2 homozygous lines to be established harbouring heterologous DAZ1 transgenes. Collectively, these results show conserved functions for both DUO1 and DAZ1/DAZ2 orthologs, highlighting the important role of the transcriptional network controlled by these male germline-specific regulators in from angiosperms.
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Sohlberg, Joel. "Regulation of plant development by the SHI-family of transcriptional regulators /." Uppsala : Dept. of Plant Biology and Forest Genetics, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200608.pdf.
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Dhansay, Mohamed Afzal. "Synthesis and metal binding properties of selected organophosphorus plant growth regulators." Thesis, University of Cape Town, 1992. http://hdl.handle.net/11427/23201.
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Puglisi, Sadie Erica. "Use of Plant Growth Regulators to Increase Branching of Clematis Spp." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/35000.
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Clematis spp. L. is a twining vine covered in showy blooms. Typical growth of hybrids is from the main leader, producing a thin, unbranched plant with one cyme. Apical dominance is released by cutting back the vine during production. Cutting back, or pinching, of a plant is labor intensive and compromises bloom for vegetative growth at time of sales. The purpose of this project was to eliminate manual pinching by treating young plants with chemical plant growth regulators (PGRs) that enhance branching without removal of the apical meristem. The first project evaluated the use of Atrimmec (dikegulac sodium), Fascination (BA+GA4+7), Florel (ethephon), and Dropp 50 (thidiazuron) on Clematis cultivars Ernest Markham, and Hagley Hybrid, and Clematis viticella 'Polish Spirit.' Plants treated with 800 mg·L-1 Atrimmec, or 800 or 1200 mg·L-1 Fascination experienced an increase in branch numbers. The second experiment manipulated the ratio of the components of Fascination, 6-BA and GA4+7, to reduce phytotoxicity experienced in the first experiment. The optimal ratio to enhance branching was 1:1, which is the stock solution for Fascination. All ratios produced phytotoxic symptoms. A third experiment tested lower rates of thidiazuron and added CPPU (forchlorfenuron) to the list of PGRs to test. The last experiment took the most effective PGR treatments, Atrimmec at 800 mg·L-1, and Fascination at 800 or 1200 mg·L-1, and compared them to the current production practices of pinching. Large flowering cultivars of clematis were used, including 'Comotesse de Bouchard,' 'Ernest Markham,' and 'Hagley Hybrid.' Atrimmec increased branch numbers and suppressed leader lengths without a mechanical pinch. Results from Fascination varied by cultivar.Master of Science
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Zhang, Yun-Heng. "Biochemistry and molecular biology of binding proteins for plant growth regulators." Thesis, De Montfort University, 2000. http://hdl.handle.net/2086/13254.
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Plant growth regulators have a vital role in plant growth and development. The cellular response to these regulators depends on the presence and the action of specific receptors. The plant growth regulators and their receptors act together in complexes which determine the final effects of the plant growth regulators. In the research reported here, emphasis has been given to the regulation of the activity of the receptors themselves. The regulation of the N-l-naphthylphthalamic acid (N~A) receptor through phosphorylation and dephosphorylation and the regulation of the auxin binding protein (ABP) through gene manipulation have been investigated. NPA, an auxin transport inhibitor, was found to bind specifically to a crude membrane preparation from sugar beet seedling leaf cell suspension cultures. The in vitro binding was optimal at pH 4.5 and 4?C. Binding parameters for NP A binding were determined by Scatchard analysis. The dissociation constant (Kd) and binding protein concentration were found to be 1.71 x 10-7 mol dm-3 and 220 pmoles g-I membrane protein respectively. It was found that the amount of specific 3H-NPA binding was significantly increased by adding Mg2+ A TP to the binding assay solution; treatment of membrane preparations with acid phosphatase, prior to the NP A binding assay, resulted in lower specific binding. A TP activation and phosphatase inactivation were culture stage dependent. Although a considerable effect could be detected when using cells from day 8 (representing the linear phase), the same treatment did not alter the binding if cells from day I (representing lag phase) or day 14 (representing the stationary phase) were used. These observations have strongly highlighted the possible involvement of a phosphorylation and dephosphorylation mechanism in vivo in the regulation of the activity of the NP A receptor. High phosphatase activity was found in the supernatant, but not in the membrane pellet, after 50,000 g centrifugation. The presence of a membrane-bound auxin receptor, ABP, was demonstrated by Scatchard analysis in sugar beet seedlings. The Kd value and the receptor concentration were found to be 2.15 x 10-6 mol dm-3 and 68 pmoles g-I membrane protein. The protein could be solubilised either with the detergent Triton X-I 00 or by acetone-washing, with a recovery of about 40%. An acetone-solubilised ABP preparation could be partially purified by DEAE-Sephacel ion exchange chromatography, NAA-linked AH-Sepharose 4B affmity chromatography or Sephadex G-200 gel filtration. The recovery after any of these chromatographic treatments was very low so that successive chromatography for further purification was unsuccessful. The low level of detectable binding after purification resulted mainly from the low abundance of ABP in the plant material. Non-radioactive labelling and detection techniques were used to show that an ABP-probe hybridized to sugar beet genomic DNA during dot blotting. The present study has indicated that receptor activity could be regulated by a phosphorylation and dephosphorylation mechanism in plants. The investigation has also suggested that the effect of plant growth regulators on plant development could be regulated through the manipulation of the expression of their receptor genes.
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Welsh, Claire Jillian. "Promoting resilience in rain grown cotton systems with plant growth regulators." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/23910.
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Rain grown cotton production is typified by significant climate variability with water limitation a focal constraint. Ensuing system exposure to climate risk results in substantial variability in production area, lint yield, lint quality and profit outcomes. Climate risk management involves manipulating multiple agronomic management and genetic solutions simultaneously; moderating existing limitations to reach the system water-limited yield potential. Such strategies can introduce management diversity to the farming system, but lack application agility, have added implementation costs and system rain-dependency often precludes their implementation. This thesis informs discourse regarding novel adaptive management opportunities utilising plant growth regulators (PGRs), to enable in-season responsive management of limitations under dynamic climatic conditions, offset climate variability and improve system resilience. Ensuing outcomes being increased farm-gate profits, through provision of improved crop resource use efficiencies, lint yield and quality outcomes, with less annualised variability. A scarcity of detailed information exists regarding cotton crop and plant responses to exogenous Gibberellin, Cytokinin and Gibberellin biosynthesis inhibiting PGR treatment scenarios, notably in early growth and under water-limited rain grown production contexts. Understanding these responses can enable future development of frameworks for strategic, predictive applications within rain grown cotton systems.
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Wright, Glenn C. "Use of Plant Growth Regulators for Improving Lemon Fruit Size - 2005." College of Agriculture, University of Arizona (Tucson, AZ), 2005. http://hdl.handle.net/10150/198104.
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Lemons were treated with several plant growth regulators for the 2005-06 season, with the hope of improving fruit size. These PGR’s included CropSet, Accel, Maxim, Messenger and MT350. Although there were some increases in yield, these were just trends, and were not statistically significant. Similarly, there was no improvement in fruit size with application of the treatment
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Bariola, Louis A. "Using Plant Growth Regulators to Control Pink Bollworms and Boll Weevils." College of Agriculture, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/219781.
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Wright, Glenn C. "Use of Plant Growth Regulators for Improving Lemon Fruit Size - 2006." College of Agriculture, University of Arizona (Tucson, AZ), 2007. http://hdl.handle.net/10150/223662.
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Lemons were treated with several plant growth regulators for the 2006-07 season, with the hope of improving fruit size. These PGR’s included Bluestim, Accel, Maxim and MT1350. Although there were some increases in yield, these were just trends, and were not statistically significant. Similarly, there was no improvement in fruit size with application of the treatments.
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Walker, Rachel Hannah. "Determining the regulators of petal spot development in Gorteria diffusa." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607968.
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Abdul-Razak, Mubarak Ali. "INFLUENCE OF GROWTH REGULATORS AND FERTILIZERS ON COTTON YIELD AND PLANT BEHAVIOR." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/184196.
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The effect of the plant regulator Mepiquat chloride (PIXᵀᴹ) (1,1-dimethyl-piperidinium chloride), in the early flowering stage, and combinations with soil and foliar application of fertilizers was investigated through seven field experiments conducted in 1982 and 1983 at three University of Arizona experimental locations. Three upland cotton cultivars (Gossypium hirsutum L.), 'Deltapine 55', '61' and '62' were used. Cotton yield, boll properties, fiber properties, leaf chlorophyll content, plant height, plant partitioning and maturity were investigated. Petiole nitrate, leaf area index (LAI) and LAI interrelationship with yield were also included in this study. The use of PIX resulted in an increase in seed cotton yield and boll weight in one of the experiments, while fiber properties did not show any significant response to either PIX or fertilizers. PIX, however, had the tendency to enhance maturity by about 1 week. Use of PIX reduced plant height in all tested cultivars at all locations. The reduction in plant height ranged from 7 to 28% depending on the cultivar, location and the amount of PIX applied. The chlorophyll a and b content of leaves increased significantly as a result of PIX application in two of four tests, while their ratio decreased. Leaf area index between treatments were not significantly different except at one sampling date. In a regression study, however, yield was found to be related positively to LAI when soil and foliar application of fertilizer were added, while it was negative when PIX was applied. Neither PIX nor BALANCEᵀᴹ (1:18:18:1) application affected plant partitioning nor petiole nitrate concentration at most of the sampling dates.
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Snelson, Jonathan Bundy. "Plant Growth and Root Zone Management of Greenhouse Grown Succulents." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/32398.
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Effects of media, soil moisture, fertility rate, and plant growth regulators on plant growth were investigated for 13 taxa of succulents.
Media: Liners were grown in five common greenhouse substrates: 80% peat, 60% bark + 30% peat moss, 80% pine bark/20% Permatil (v/v), 100% composted pine bark, or whole tree substrate until market ready. Overall, higher percentage bark mixes yielded smaller plants, with lower shoot dry weights, shoot heights and widths.
Soil Moisture: Liners were potted into a 60% bark/30% peat soilless potting mix. In group 1 , irrigation to container capacity occurred when volumetric soil moisture content fell below 30%, 20%, or 10%,. Group two (seven species) irrigation thresholds were shifted to 35%, 25%, and 15%. Effects of irrigation rate were significant in three of the 13 species studied, and those effects were species-specific.
Fertility Rate: Liners were potted into60% bark/30% peat substrate. Fertility reatments in group were 0, 50, 100, or 200 mg.L-1 nitrogen. Group 2 plants received treatments of 50, 150, 250, or 350 mg.L-1 nitrogen. Four of the 11 species studied were affected by nitrogen rate, with rates up to 200 mg.L-1 generally producing the largest plants.
PGRs: Seven species were potted into a 60% bark/30% peat substrate. Group one plants were treated with a foliar application of benzyladenine (Configure) at rates of 0, 400, 800, or 1600 mg.L-1. Group 2 plants were treated either BA at 0, 250, 500, or 1000 mg.L-1, dikegulac sodium (Augeo) at 400, 800, or 1600 mg.L-1, or a tank mix of 500 mg.L-1 Configure and 800 mg.L-1 Augeo. BA caused an increase in branches leaders or offsets in two species.Master of Science
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Zhang, Lingqing. "Alkaline phosphatase activities of aureoumbra lagunensis in phosphate-limited and hypersaline conditions /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?BIOL%202007%20ZHANGL.
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Deveson, M. R. "Effects of plant growth regulators on root growth and root/shoot integration in wheat (Triticum aestivum L.)." Thesis, University of Reading, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376235.
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McCarthy, Timothy James. "Studies towards the total synthesis of (+)-ovalifoliene and other plant growth regulators." Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314551.
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Lombard, Petrus Johannes. "A biochemical study of budbreak and plant growth regulators in table grapes." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52617.
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Thesis (MSc)--Stellenbosch University, 2002.ENGLISH ABSTRACT: The cultivation of table grapes in the warmer areas of South Africa, indeed worldwide, is complicated by rest breaking problems in spring due to delayed budbreak. In order to overcome these problems rest breaking agents, mainly hydrogen cyanamide, are applied. However, instead of alleviating the problem, additional problems such as uneven budbreak and reduced production are often induced. This study was initiated to further understand the physiological processes occurring during budbreak and how the application of hydrogen cyanamide influences these processes. The following aspects were investigated in this study: a. The effect of hydrogen cyanamide on tissue cytokinin (specifically zeatin riboside) levels of Sultanina table grape vines after application at different times before natural budbreak was studied over two seasons. In 1997, hydrogen cyanamide was applied at three weeks before induced budbreak and in 1998 at six weeks before induced budbreak. One year-old canes were sampled weekly after hydrogen cyanamide application, divided into distal and proximal sections, then further divided into buds, bark and wood tissues and the zeatin riboside (ZR) levels determined. A relatively high amount of chilling coupled to late hydrogen cyanamide application in 1997 led to a large effect on ZR release, but did not lead to significant shifting of the budbreak pattern. Zeatin riboside peaks were observed in buds, internode wood and bark of treated vines compared to control vines. The peaks were higher in distal portions compared to proximal portions in all tissues. The relatively lower chilling and earlier application of hydrogen cyanamide in 1998 had a larger effect on the budbreak pattern while the bud ZR peak was shifted earlier. The distal portion bud ZR . peak was again higher than the proximal portion bud ZR peak. In 1997, as sampling was not initiated early enough, bud ZR peaks were only observed after budbreak, while in 1998 bud ZR peaks were observed before and after budbreak. The effect of these ZR increases on the development of inflorescence primordia, subsequent bunch development and ultimately production, are discussed. b. Free xylem sap was sampled at cane and spur pruned lengths from unpruned canes of Sultanina from budswell until after budbreak in 1999 and from three table grape cultivars, i.e Sultanina, Alphonse Lavalleé and Sunred Seedless, in 2001 and ZR levels determined. The ZR levels in the buds of these three table grape cultivars, pruned to different cane lengths were also determined. One year old canes of these cultivars, were each pruned to long canes (14 buds) and short spurs (2 buds). The ZR content in buds of these canes at distal and proximal positions were determined weekly from budswell until after budbreak in 1999. Xylary ZR peaks occurred before 50% budbreak. Spur xylary ZR levels of all three cultivars followed a similar pattern, although at lower ZR levels than that of the canes. This is similar to previous studies on xylary ZR levels of apple shoots. The high levels of free ZR found in xylem sap at the distal portions of canes support the hypothesis of a cumulative ZR build-up effect as cane length increases. Spur pruning resulted in earlier budbreak and a higher final budbreak than cane pruning. The proximal portions of shoots, whether spur pruned or the proximal portions of canes, showed elevated ZR levels in all cultivars. This difference in ZR levels in bud tissue of different portions of the cane would suggest a difference in ZR consumption or turnover. The results of this study have important management implications for the cultivation of vines in warmer areas in which hydrogen cyanamide is used to alleviate budbreak problems.
AFRIKAANSE OPSOMMING: Die verbouing van tafeldruiwe in die warmer gebiede van Suid-Afrika, soos straks wêreldwyd, word bemoeilik deur rusbreekprobleme in die lente weens vertraagde bot. Rusbreekmiddels, meestal waterstofsiaanamied, word gevolglik toegedien om hierdie probleme te probeer oorkom. In plaas van opheffing van die probleem, veroorsaak hierdie toedienings somtyds addisionele probleme soos ongelyke bot en verlaagde produksie. Hierdie studie is aangepak om die fisiologiese prosesse wat tydens bot plaasvind, beter te verstaan, asook hoe die toediening van waterstofsiaanamied hierdie prosesse beïnvloed. Die volgende is in hierdie studie ondersoek: a. Die invloed van waterstofsiaanamied op lootweefsel sitokinien (naamlik zeatin ribosied, ZR) vlakke van 'n Sultanina tafeldruif wingerd is oor twee seisoene ondersoek na toediening op verskillende tye voor bot. Waterstofsiaanamied is in 1997 drie weke en in 1998 ses weke voor geïnduseerde bot toegedien. Een jaar oue lote is weekliks gemonster na waterstofsiaanamied toediening, verdeel in apikale en basale gedeeltes en verder verdeel in ogies, bas en houtweefsel en die ZR vlakke bepaal. Relatief hoër vlakke koue, gekoppel met later watersiaanamied toediening het in 1997 tot 'n groot effek op ZR vlakke gelei, maar het nie die botpatroon wesentlik verskuif nie. Zeatin ribosied pieke is waargeneem in ogies, internode hout en bas van behandelde wingerd in vergelyking met kontrole wingerd. Die pieke was hoër in apikale gedeeltes in vergelyking met basale gedeeltes in alle weefsels. Die relatief laer koue en vroeër toediening van waterstofsiaanamied in 1998 het 'n groter effek op die botpatroon gehad, terwyl die ogie ZR piek vroeër geskuif is. Die apikale gedeelte se ogie ZR piek was weereens hoër as die basale gedeelte se ogie ZR piek. Monstering was nie vroeg genoeg begin in 1997 nie, aangesien ogie ZR pieke slegs na bot waargeneem is, terwylogie ZR pieke in 1998 voor en na bot waargeneem is. Die effek van hierdie verhoging in ZR vlakke op die ontwikkeling van blom primordia, daaropvolgende tros ontwikkeling en uiteindelik produksie, is bespreek. b. Vry xileemsap is gemonster van langdraer en kortdraer gedeeltes van ongesnoeide lote van Sultanina vanaf ogieswel tot na bot in 1999 en vanaf drie tafeldruif kultivars, naamlik Sultanina, Alphonse lavalleé en Sunred Seedless, in 2001 en die ZR vlakke bepaal. Die ZR vlakke van ogies van hierdie drie kultivars, gesnoei tot verskillende lootlengtes is ook bepaal. Eenjarige lote van hierdie kultivars is gesnoei tot langdraers (14 ogies) en kortdraers (2 ogies). Die ZR vlakke in ogies geleë op apikale en basale gedeeltes van hierdie lote is weekliks in 1999 bepaal vanaf ogieswel tot na bot Xileemsap ZR pieke is waargeneem voor 50% bot. Kortdraer xileemsap ZR vlakke het 'n soortgelyke patroon as die langdraers gevolg vir al drie kultivars, alhoewel teen laer ZR vlakke as die langdraers. Hierdie waarneming is soortgelyk aan vorige studies op xileemsap ZR vlakke van appel lote. Die hoë ZR vlakke gevind in die xileemsap van die apikale gedeeltes van lote ondersteun die hipotese van 'n kumulatiewe opbou van ZR soos die lengte van die loot toeneem. Die snoei van lote as kortdraers het gelei tot vroeër bot en 'n hoër finale bot persentasie as die snoei van langdraers. Die basale gedeeltes van lote het verhoogde ZR vlakke in al drie kultivars getoon, onafhanklik van die feit dat dit vanaf die kortdraer of die basale gedeelte van 'n langdraer was. Hierdie verskil in ZR vlakke in ogie weefsel van verskillende gedeeltes van die loot impliseer 'n verskil in ZR verbruik of omset. The resultate van hierdie studie het belangrike bestuursimplikasies vir die verbouing van wingerd in warmer gebiede, waar waterstofsiaanamied gebruik word om botprobleme te oorkom.
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Grossman, Mara Celeste. "Use of Plant Growth Regulators to Improve Branching of Herbaceous Perennial Liners." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/32830.
Full textAbstract:
The objective of this study is to evaluate the efficacy of PGRs to improve branching during
production of herbaceous perennial liners and finished plants. The effects of benzyladenine (BA)
on the branching and root and shoot growth of Agastache Clayt. Ex Gronov. 'Purple Hazeâ ,
Gaura lindheimeri Engelm. & A. Gray 'Siskiyou Pink', Lavandula à intermedia Emeric ex
Loisel. 'Provence', Leucanthemum à superbum (Bergmans ex J.W. Ingram) Bergmans ex Kent.
'Snowcap', and Salvia à sylvestris L. (pro sp.) 'May Night' was tested. Root dry weight was found
to be highly correlated to root volume and root surface area. In liners, all taxa except Salvia had
increased branching while all except Gaura had reduced rooting. Increased branching was not
evident in most taxa as finished plants. The effects of BA on Aster 'Professor Anton Kippenbergâ
(Symphyotrichum novi-belgii L.'Professor Anton Kippenburg'), Campanula punctata Lam.
'Cherry Bells,' Cosmos atrosanguineus (Hook) Voss., Verbena bonariensis L. 'Lollipop,'
Rosmarinus officinalis L.'Hill Hardy' and Veronica spicata L. â Goodness Grows.â was tested. BA
increased branching of three taxa as liners while roots were not affected. The addition of IBA did
not improve root growth in BA-treated plants. Dikegulac sodium and ethephon were evaluated as
branching enhancers in the same six perennials. Dikegulac increased branching of all except
Campanula while ethephon increased branching in Veronica and Verbena. The effects of
application time of BA on the branching of Agastache Clayton ex Gronov. â Tutti Fruttiâ and
Verbena bonariensis 'Lollipop' was evaluated with application of BA at 0, 7, 14, 17, 20 and 21
days after sticking (DAS); however growth was reduced in plants treated before rooting had
occurred. Agastache finished plants treated at 14 DAS had increased branching whereas
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branching was not affected in Verbena liners or finished plants. The effects of single or multiple
applications of BA and dikegulac sodium on Sedum spectabile Boreau â Autumn Joy,' Gaillardia
aristata Pursh â Gallo Red,â Phlox paniculata L. â Bright Eyes,â Nepeta racemosa Lam. â Walkerâ s
Low,â Delosperma NE Br. â Table Mountain,â and Achillea L. â Moonshineâ were evaluated. Two
applications of PGR was most effective at increasing branching in finished plants. High rates of
dikegulac sodium reduced growth in most plants studied while BA increased branches without
negatively affecting plant growth.Master of Science
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Zhou, Dongfang. "Using Plant Growth Regulators to Improve the Quality of Containerized Herbaceous Peony." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/98808.
Full textAbstract:
Herbaceous peonies (Paeonia lactiflora Pall.) are common perennials used both in gardens and the landscape as well as for cut flowers. Peonies require a chilling period to break dormancy but not for flower bud differentiation. For all studies discussed in this dissertation, two peony cultivars, Sarah Bernhardt and Inspecteur Lavergne, small (3–5 eye) crowns from Holland were potted in 3.8-L pots in mid-November of 2017 and 2018. Our overall objective was to determine if we could manipulate chilling time, along with application of gibberellic acid (GA3) and growth retardants, to produce marketable containerized peonies from a small crown in a single season (November to May).
We evaluated chilling, GA3 and a growth retardant (uniconazole; UNZ) under controlled chilling and greenhouse forcing conditions. All potted plants were held outdoors at Battlefield Farms (Rapidan, VA, 38˚ N) for 4 weeks [in 2017, 400 chilling units (CU) according to Fulton Chilling Model] or in a 10°C cooler for 5.5 weeks (in 2018, 400 CU) to root, then placed in a 5°C cooler for 3, 4 or 5 weeks (total 752, 869 or 986 CU). GA3 was applied as a 0 or 100 mg·L-1 drench at 250 ml/pot after the plants were moved into the Virginia Tech greenhouse (Blacksburg, VA, 37˚ N) for forcing. Uniconazole drenches were applied to each cultivar under each chilling treatment at 355 ml/pot at 0, 15, or 20 mg·L-1 at 7 days after the GA3 drench applications. Three weeks chilling at 5°C (752 CU total) provided sufficient chilling for 'Sarah Bernhardt' and 'Inspecteur Lavergne'. Application of GA3 reduced production time and resulted in a greater number of shoots, and, in three of the four studies, increased the number of flowering shoots in three of the four studies. Substrate drench application of 15 mg·L-1 UNZ prior to spring emergence reduced plant width moderately resulting in improved compactness of both cultivars.
We evaluated the effects of plant growth retardants applied with different methods at different stages of production on the growth and development of containerized peony under nursery conditions. All potted plants were placed in an unheated coldframe at the Virginia Tech Urban Horticulture Center (Blacksburg, VA, 37˚ N) for one month after potting to promote rooting and then were moved outdoors to a gravel pad to receive natural chilling from November to February. In 2017–18, substrate drenches of UNZ at 0, 15, 30 or 45 mg·L-1 or paclobutrazol (PBZ) at 0, 30, 60 or 90 mg·L-1 at 237 mL/pot were applied about 4 weeks after potting for both cultivars in mid-December 2017. In 2018–19, fall drenches of uniconazole at 0, 15, 30 or 45 mg·L-1 at 237 mL/pot were applied about 4 weeks after potting in mid-December 2018, or spring sprenches of uniconazole were applied at 0, 15, 30 or 45 mg·L-1 at 840 mL·m-2 in March 2019 after 50% shoot emergence for each cultivar. Plant growth retardant applications had little effect on plant growth of either cultivar, but treated plants were of a darker green color compared to the control plants. In addition, higher rates of uniconazole applied as a fall drench increased the number of flowering shoots of both cultivars and the percentage of plants flowering for 'Sarah Bernhardt' in the second season of the study where plants were more protected from spring freezes. Fall paclobutrazol drenches or spring uniconazole sprenches had little effect on flowering.
To determine the best timing for spring GA3 applications under nursery conditions, we applied three models based on natural chilling accumulation. The models were a modified Fulton Chilling Model (FCM) for herbaceous peonies, Blackberry Chilling Model 5 (BCM5) for blackberry, or a visual development model (VDM) which was 10% of plants showing shoot emergence in the spring. We choose 1,000 CU for the first two chilling models as the chilling required to break dormancy and promote normal plant growth and flowering. All plants were held in an unheated coldframe at the Virginia Tech Urban Horticulture Center for one month after potting to promote rooting, then were moved outdoors to a gravel pad to receive natural chilling over the winter months. Drenches of 0 or 100 mg·L-1 GA3 were applied at 250 mL/pot to each cultivar under each chilling model when the specific conditions were met. Due to greater winter injury in the 2017–18 season, results varied by year. In the 2017–18 season, GA3 applied according to BCM5 reduce days to emergence for both cultivars and reduce the plant width of 'Inspecteur Lavergne', and later application according to BCM5 and VDM reduced plant length and diameter of 'Sarah Bernhardt'. Reductions in plant size may have been due to greater winter injury due to the earlier emergence of GA3 treated plants. In the 2018–19 season, earlier GA3 drench applications tended to reduce days to emergence for both cultivars and the FCM application reduced days to bud for 'Inspecteur Lavergne', but GA3 drench applications had no effect on plant size. GA3 can be applied after chilling (1,000 CU) using a suitable chilling model such as FCM for peonies, or BCM5, or VDM, but GA3 had little effect on plant development under nursery conditions.
We also evaluated GA3 effects on peony bud differentiation and development during controlled chilling and early forcing, as well as effects on growth and flowering. All potted plants were held in a 10°C cooler for 5.5 weeks (400 CU) to root, then placed in a 5°C cooler for 4 weeks (total 869 CU). GA3 was applied at 0 or 100 mg·L-1 pre-chilling or post-chilling as a 250 ml/pot drench. Bud differentiation and development of excised buds were evaluated using a stereomicroscope at potting, after rooting (before chilling), after 1, 2, 3 or 4 weeks of chilling, and at 5, 10 or 15 days after the beginning of forcing. All buds were removed from the sample plants, measured for bud length and diameter, and dissected under a stereomicroscope to assess differentiation stages. Root dry weights and crown dry weights were also determined after rooting, after chilling, and at 15 days of forcing. Ten plants of each treatment were grown in the Virginia Tech greenhouse after chilling until flowering. GA3 applications did not advance the bud development stage because most of buds were already in the reproductive stages before dormancy, but GA3 enhanced bud elongation during chilling and the early forcing period. Our findings suggest that GA3 applications can reduce the time to emergence and flowering, as well as increase the numbers of shoots and flowering shoots. GA3 applied right after rooting in, prior to the chilling period, or before greenhouse forcing, resulted in earlier emergence and flowering with higher quality plants. However, earlier applications, pre-chilling, tended to produce plants with more shoots.
Overall, our experiments indicate that three weeks of chilling at 5°C (752 CU total) is a sufficient chilling regime for forcing 'Sarah Bernhardt' and 'Inspecteur Lavergne' peonies, and 1,000 CU of naturally accumulated chilling is sufficient for nursery production. GA3 applications can reduce the time to emergence and flowering, as well as increase the numbers of total shoots and flowering shoots. Timing of GA3 application is flexible; it can be applied right after rooting, before the chilling period, just before greenhouse forcing, or after shoots have begun to emerge. Plant growth retardant applications had a little effect on the growth of tested cultivars, but all plants treated with growth retardants are generally darker green in color. Additionally, growth retardant applications have some positive effects on flowering.Doctor of Philosophy
Herbaceous peonies (Paeonia lactiflora Pall.) are common perennials used both in gardens and the landscape as well as for cut flowers. Peonies require a chilling period to break dormancy but not for flower bud differentiation. For all studies, two peony cultivars, Sarah Bernhardt and Inspecteur Lavergne, 3 to 5 eye small crowns from Holland were potted in 3.8-L pots in mid November of 2017 and 2018. Our overall objective was to determine if we could manipulate chilling time, along with application of gibberellic acid (GA3) and growth retardants, to produce marketable containerized peonies from a small crown in a single season (November to May). We evaluated chilling, GA3 and a growth retardant (uniconazole) under controlled chilling and greenhouse forcing conditions. We evaluated the effects of plant growth retardants (uniconazole or paclobutrazol) applied with different methods (fall drenches or spring sprenches) at different stages of production on the growth and development of containerized peony under nursery conditions. To determine the best timing for spring GA3 applications under nursery conditions, we applied three models based on natural chilling accumulation. We also evaluated GA3 effects on peony bud differentiation and development during controlled chilling and early forcing, as well as growth and flowering. Overall, 3 weeks chilling at 5°C [752 chilling units (CU) total] is a sufficient chilling regime for forcing 'Sarah Bernhardt' and 'Inspecteur Lavergne' peonies, and 1000 CU naturally accumulated chilling is sufficient for nursery production. GA3 applications can reduce the time to emergence and flowering, as well as increase the numbers of shoots and flowering shoots. Timing of GA3 application is flexible, it can be applied right after rooting, after the chilling period, or after shoots have begun to emerge. Plant growth retardant applications had little effect on plant growth of either cultivar, but all plants treated with growth retardants were darker green in color. Additionally, growth retardant applications had some positive effects on flowering.
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Ibrahim, Mohammed. "Physiological and metabolic responses of two rose varieties to plant growth regulators." Thesis, Ibrahim, Mohammed (2018) Physiological and metabolic responses of two rose varieties to plant growth regulators. PhD thesis, Murdoch University, 2018. https://researchrepository.murdoch.edu.au/id/eprint/45991/.
Full textAbstract:
Rose (Rosa hybrida) is one of the most popular cut flowers with a worldwide production of more than 300 million stems per year. The perfume industry, which relies on a range of scented rose varieties, is also an important industrial application for roses. Among the numerous types of roses are some recent varieties including Hybrid Tea and Floribunda roses. The major problem in Australia is accelerated pre- and post-harvest flower drop and senescence, caused by deficiencies in endogenous plant growth regulators (PGRs). PGRs play important roles in the growth and development of flowers, especially in aromatic plants, stimulating the emission of volatile organic compounds (VOCs). The PGRs benzyladenine (BA) and naphthalene acetic acid (NAA) which belong to cytokinin and auxin group of PGRs respectively, are used by the floriculture industry as important growth regulators for promoting rose growth and development. However, it is still unknown that how these regulators and their application dosages influence rose plants. Therefore, this thesis aimed to evaluate and determine the efficacy of various concentrations of BA and NAA on arrange of morphological and physiological characteristics of roses to increase flowers longevity in two rose varieties (Floribunda and Hybrid Tea). In addition, this study was conducted to understand how different concentrations of BA and NAA effect the metabolic changes in different rose tissues together with a comparison of VOCs changes.
This work in this thesis developed and optimized the headspace solid-phase microextraction (HS-SPME) with three-phase fibre 50/30μm divinylbenzene/carboxen/polydimethylsiloxane (DVB/CAR/PDMS) coupled with gas chromatography-flame ionization detection (GC-FID) and gas chromatography-mass spectrometry (GC-MS) method for exploring and analysing VOCs emitted from the intact and excised flowers, leaves, and stems as well as from the rhizosphere and whole plants of the two rose varieties.
This study has optimized different environmental factors involved in the performance of the two rose varieties was conducted, and three physiological characteristics photosynthesis rate, respiration rate, and chlorophyll content were assessed. Three different concentrations (0, 100 and 200 mg/L) of BA and NAA were applied to the two rose varieties, and different morphological and physiological characteristics were evaluated. For physiological effects (photosynthesis rate and chlorophyll index) studies, application of 200 mg/L of both BA and NAA were shown to increase plant height, numbers of branches and flowers, stem and flower diameters, length of flower stems and flower longevity, compared to the control. However, for the respiration rate, the control plants had significantly superior performance to the plants treated with 100 and 200 mg/L BA and NAA, for both rose varieties.
The VOC profiles of the two rose varieties were characterized by the optimized HS-SPME-GC method. The effects of different concentrations (0, 100 and 200 mg/L) of BA and NAA on the VOCs emitted from different rose tissues for the two rose varieties were determined. The highest amounts extracted, and evaluated from the sum of peak areas were achieved after the application of 200 mg/L BA and NAA in both varieties. Of the emitted VOCs, 20 were significantly different in treated compare to non-treated Floribunda and Hybrid Tea roses from different rose tissues. Moreover, five compounds 4-heptyn-2-ol, cis-muurola-4(14)5-diene, γ -candinene, y-muurolene and prenyl acetate increased significantly after applications of 200 mg/L of BA and NAA. These five compounds have great potential to develop commercially important new rose growth regulators. The actual dosages of BA applied to the leaves was determined using filter paper as 11.16 mg/cm2 and 7.17 mg/cm2 for Hybrid Tea and Floribunda respectively. In conclusion, the application to rose plants of different concentrations of BA and NAA can promote a number of changes to both morphological and physiological parameters, and in turn have a significant effect on metabolite changes in different rose tissues. Application BA and NAA method could be applied to other floriculture plants to increase the flowers production in rose or other ornamental plants.
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Rethwisch, Michael D., Michael D. Kruse, and Justin Parker. "Effects of Aerially Applied Plant Growth Regulators on Alfalfa Quality and Yields." College of Agriculture, University of Arizona (Tucson, AZ), 1996. http://hdl.handle.net/10150/202434.
Full textAbstract:
Plant growth regulators were aerially applied on April 26, 1996, to two alfalfa fields, one (Cibola) in its first year of production and the other field (CUF 101) in its third year. The first year field was approximately 50% through the cutting cycle and the third year field was approximately 30% through the cutting cycle when applications were made. No statistical differences were noted in hay tonnage the first cutting after application. Yield increases due to treatments were noted in the second cutting and maximum increases ranged from 277 -461 lbs of hay per acre. No yield or quality differences were noted the third cutting after application. The two fields differed in their response. The lowest rates of plant growth regulators produced higher yields in the first year field, but these treatment rates had greatly lowered hay quality the previous cutting. These effects were not noticed in the third year stand field. Increased hay tonnage was noted in the third year field from the 16 oz/acre rates, but was not evident in the first year field. Hay quality was usually highest in the check the first two cuttings after treatment. It is unknown if the differences noted between the two fields are due to different age of plants, variety and/or stage of growth when treatments were applied.
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Rethwisch, Michael D., Greg Hurtado, and Rosario Hurtado. "Comparison of Various Plant Growth Regulators on Pima S-7 Cotton Yields." College of Agriculture, University of Arizona (Tucson, AZ), 1996. http://hdl.handle.net/10150/210772.
Full textAbstract:
All plant growth regulators and nutritional products applied to Pima S-7 cotton during bloom economically increased lint yields, with increases ranging from 80 - 261 lbs. /acre. Greatest increase was noted with Boll-Set Plus, a product that contains raised levels of calcium and zinc. Cytokin and Boll -Set Plus significantly increased yields at one location. A lint yield increase of approximately 40 lbs/acre was noted when Tech-Flo Alpha was added to Cytokin. A single application of Foliar Triggrr resulted in equal yields as two applications of the Cytokin plus Tech-Flo Alpha.
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Mohr, Peter G., and lswan@deakin edu au. "Abscisic acid regulation of plant defence responses during pathogen attack." Deakin University. School of Biological and Chemical Sciences, 2004. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20060927.120049.
Full textAbstract:
The plant hormone, abscisic acid (ABA), has previously been shown to have an impact on the resistance or susceptibility of plants to pathogens. In this thesis, it was shown that ABA had a regulatory effect on an extensive array of plant defence responses in three different plant and pathogen interaction combinations as well as following the application of an abiotic elicitor. In unique studies using ABA deficient mutants of Arabidopsis, exogenous ABA addition or ABA biosynthesis inhibitor application and simulated drought stress, ABA was shown to have a profound effect on the outcome of interactions between plants and pathogens of differing lifestyles and from different kingdoms. The systems used included a model plant and an important agricultural species: Arabidopsis thaliana (Arabidopsis) and Peronospora parasitica (a biotrophic Oomycete pathogen), Arabidopsis and Pseudomonas syringae pathovar tomato (a biotrophic bacterial pathogen) and an unrelated plant species, soybean (Glycine max) and Phytophthora sojae (a hemibiotrophic Oomycete pathogen), Generally, a higher than basal endogenous ABA concentration within plant tissues at the time of avirulent pathogen inoculation, caused an interaction shift towards what phenotypically resembled susceptibility. Conversely, a lower than basal endogenous ABA concentration in plants inoculated with a virulent pathogen caused a shift towards resistance. An extensive suppressive effect of ABA on defence responses was revealed by a range of techniques that included histochemical, biochemical and molecular approaches. A universal effect of ABA on suppression or induction of the phenylpropanoid pathway via regulation of the key entry point gene, phenylalanine ammonia-lyase (PAL), when stimulated by biotic or abiotic elicitors was shown. ABA also influenced a wide variety of other defence-related components such as: the development of a hypersensitive response (HR), the accumulation of the reactive oxyden species, hydrogen peroxide and the cell wall strengthening compounds lignin and callose, accumulation of SA and the phytoalexin, glyceollin and the transcription of the SA-dependent pathogenesis- related gene (PR-1). The near genome-wide microarray gene expression analysis of an ABA induced susceptible interaction also revealed an yet unprecedented insight into the great diversity of defence responses that were influenced by ABA that included: disease resistance like proteins, antimicrobial proteins as well as phenylpropanoid and tryptophan pathway enzymes. Subtle differences were found in the number and type of defence responses that were regulated by ABA in each type of plant and pathogen interaction that was studied. This thesis has clearly identified in plant/pathogen interactions previously unknown and important roles for ABA in the regulation of many defence responses.
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Hood, L. R. "Multiple Plant Growth Regulator Use on Short Staple Cotton." College of Agriculture, University of Arizona (Tucson, AZ), 1993. http://hdl.handle.net/10150/209534.
Full textAbstract:
A field trial was initiated during the 1992 growing season to evaluate the activity of Cytokin and Piz applied alone or in combination to short staple cotton. The Cytokin treatment significantly increased lint yield over the other treatments. There were no statistically significant differences between the non-treated check and any other treatment. The Cytokin treatment increased lint yield an average of 81 pounds over the check plots. Fruit retention remained high throughout the season, indicating that Pix would not normally have been needed.
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Hood, L. R. "Multiple Plant Growth Regulator Use on Short Staple Cotton." College of Agriculture, University of Arizona (Tucson, AZ), 1995. http://hdl.handle.net/10150/210271.
Full textAbstract:
A field trial was conducted during the 1992 & 1993 growing seasons to evaluate the activity of Cytokin and Pic applied alone or in combination to short staple cotton. The Cytokin treatment significantly increased tint yield over the other treatments in 1992. There were no statistically significant seed cotton differences between the non - treated check and any treatment in 1993. Fruit retention remained high throughout 1992 and very high throughout the 1993 season. Under high fruiting conditions, use of a plant growth regulator would not normally be recommended.
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Dalgleish, Harmony J. "Belowground bud banks as regulators of grassland dynamics." Diss., Manhattan, Kan. : Kansas State University, 2007. http://hdl.handle.net/2097/312.
Full text
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Norton, E. R. "Scheduling Techniques for the Use of Pentia Plant Growth Regulator." College of Agriculture, University of Arizona (Tucson, AZ), 2005. http://hdl.handle.net/10150/198162.
Full textAbstract:
A single field study was conducted at the University of Arizona Safford Agricultural Center during the 2004 season to evaluate the utilization of a feedback technique that is based upon plant growth and development to schedule applications of the new plant growth regulator (PGR) from BASF, Pentia. A simple three treatment study was constructed consisting of a control treatment (no Pentia application), a scheduled treatment (application of 16 oz/acre at first bloom regardless of plant growth), and a feedback treatment (applications based upon plant growth and development). Application decisions on the feedback treatment were made using height to node ratios (HNR) as a measure of plant vigor. Treatment applications were made on the scheduled regime on 14 July with a one time 16 oz/acre application. The feedback regime received an application (16 oz/acre) of Pentia five days later on 19 July. An additional application (16 oz/acre) was made on the feedback treatment on 3 August due to continued high HNR levels. Significant differences in plant vigor were observed post application among the three treatments as measured by end of season HNR ratios. Yield results indicated positive lint yield response to Pentia application with both the scheduled and feedback treatment producing statistically higher yields than the control. Differences between the feedback and scheduled treatments were not statistically different however a slight yield increase was observed in the scheduled treatment. The second Pentia application made to the feedback treatment was not necessary. End of season HNR measurements indicate that the additional 16 oz/acre application suppressed growth to below the average baseline for HNR. These results indicate that potential positive response to PGR applications, specifically Pentia, under conditions of high vigor.
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