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Dissertations / Theses on the topic 'Dwarfism in plants'

Author: Grafiati

Published: 4 June 2021

Last updated: 28 July 2025

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1

Ouzounis, Theoharis. "Storage nitrogen manipulations in sweet cherry (Prunus avium L.) on dwarfing rootstocks." Diss., Connect to online resource - MSU authorized users, 2008.

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2

Cooper, Curtis Steven. "Meteorologies of Brown Dwarfs and Extrasolar Giant Planets." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/195544.

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This dissertation explores the consequences of atmospheric dynamics for observations of substellar mass objects (SMOs). Discussed first is the growth of cloud particles of various compositions in brown dwarfs of different surface gravities and effective temperatures. The structure of these objects is calculated with a one-dimensional radiative transfer model. To determine particle sizes, the timescales for microphysical growth processes, including nucleation, coagulation, and coalescence, are compared to the timescale for gravitational sedimentation. The model also allows for sustained uplifti

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3

Gallardo, José. "Physics of low mass stars, brown dwarfs and extrasolar planets." Lyon, École normale supérieure (sciences), 2007. http://www.theses.fr/2007ENSL0412.

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4

Rodriguez-Barrera, Maria Isabel. "Ionization in atmospheres of brown dwarfs and giant gas planets." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/11363.

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Recent observations of ultra-cool objects suggest that the gas in their uppermost atmospheres is heated, ionised and magnetised to levels that radio and X-ray emission is possible. The aim of this work is to identify which low mass objects are most susceptible to plasma and magnetic processes by the effect of thermal ionisation and Lyman continuum photoionisation from the irradiation of external sources in different environments. I focus my work on very low mass, ultra-cool objects (late M-dwarfs, brown dwarfs and giant gas planets: T[sub]eff = 1000 . . . 3000 K) to analyse the electrostatic a

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5

Tan, Xianyu, and Adam P. Showman. "Effects of Latent Heating on Atmospheres of Brown Dwarfs and Directly Imaged Planets." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/624643.

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The growing number of observations of brown dwarfs (BDs) has provided evidence for strong atmospheric circulation on these objects. Directly imaged planets share similar observations and can be viewed as low-gravity versions of BDs. Vigorous condensate cycles of chemical species in their atmospheres are inferred by observations and theoretical studies, and latent heating associated with condensation is expected to be important in shaping atmospheric circulation and influencing cloud patchiness. We present a qualitative description of the mechanisms by which condensational latent heating influe

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6

Amirsadeghi, Sasan. "Phenotypic analysis of plant dwarfing induced by overexpression of a tobacco Myb gene." Thesis, University of Leicester, 2000. http://hdl.handle.net/2381/29807.

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The tobacco NtmybAS1 gene encodes a novel anther-specific member of the Myb family of transcription factors. Overexpression of NtmybAS1 driven by the CaMV35S promoter in tobacco resulted in dramatic alterations in plant architecture leading to a semi-dominant dwarf phenotype. Northern blot analysis demonstrated a direct relationship between the severity of dwarf phenotype and the level of NtmybAS1 transcripts, which clearly indicated that the NtmybAS1-induced dwarfing is gene dosage dependent. Analysis of cell morphology demonstrated that a severe reduction of cell elongation in hypocotyls was

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7

Lindgren, Sara. "Metallicity determination of M dwarfs." Doctoral thesis, Uppsala universitet, Observationell astrofysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-332102.

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M dwarfs constitute around 70% of all stars in the local Galaxy. Their multitude together with their long main-sequence lifetimes make them important for studies of global properties of the Galaxy such as the initial mass function or the structure and kinematics of stellar populations. In addition, the exoplanet community is showing an increasing interest for those small, cold stars. However, very few M dwarfs are well characterized, and in the case of exoplanetary systems the stellar parameters have a direct influence on the derived planet properties. Stellar parameters of M dwarfs are diffic

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8

Biller, Beth A., Johanna Vos, Esther Buenzli, et al. "Simultaneous Multiwavelength Variability Characterization of the Free-floating Planetary-mass Object PSO J318.5−22." IOP PUBLISHING LTD, 2018. http://hdl.handle.net/10150/627034.

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We present simultaneous Hubble Space Telescope (HST) WFC3+Spitzer IRAC variability monitoring for the highly variable young (similar to 20 Myr) planetary-mass object PSO J318.5-22. Our simultaneous HST + Spitzer observations covered approximately two rotation periods with Spitzer and most of a rotation period with the HST. We derive a period of 8.6. +/-. 0.1 hr from the Spitzer light curve. Combining this period with the measuredvsinifor this object, we find an inclination of 56 degrees.2. +/-. 8 degrees.1. We measure peak-to-trough variability amplitudes of 3.4%. +/-. 0.1% for Spitzer Channel

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9

Hodosán, Gabriella. "Lightning on exoplanets and brown dwarfs." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/12079.

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Lightning is an important electrical phenomenon, known to exist in several Solar System planets. Amongst others, it carries information on convection and cloud formation, and may be important for pre-biotic chemistry. Exoplanets and brown dwarfs have been shown to host environments appropriate for the initiation of lightning discharges. In this PhD project, I aim to determine if lightning on exoplanets and brown dwarfs can be more energetic than it is known from Solar System planets, what are the most promising signatures to look for, and if these "exo-lightning" signatures can be detected fro

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10

Pinilla, P., L. H. Quiroga-Nuñez, M. Benisty, et al. "Millimeter Spectral Indices and Dust Trapping By Planets in Brown Dwarf Disks." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/625749.

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Disks around brown dwarfs (BDs) are excellent laboratories to study the first steps of planet formation in cold and low-mass disk conditions. The radial-drift velocities of dust particles in BD disks higher than in disks around more massive stars. Therefore, BD disks are expected to be more depleted in millimeter-sized grains compared to disks around T Tauri or Herbig Ae/Be stars. However, recent millimeter observations of BD disks revealed low millimeter spectral indices, indicating the presence of large grains in these disks and challenging models of dust evolution. We present 3 mm photometr

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11

Cheetham, Anthony Craig. "High Resolution Imaging and the Formation of Stars and Planets." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/13630.

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Understanding the formation of stellar and planetary systems is one of the great challenges of contemporary astrophysics. This thesis describes progress towards understanding these processes, through advancement of techniques to enable high resolution imaging of faint companions and other structures in the immediate environs of young stars. To ensure optimal performance in an era of large segmented telescopes, techniques to precisely cophase the mirror segments are required. In this thesis we propose the Fizeau Interferometric Cophasing of Segmented Mirrors algorithm, and present the results

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12

Deshpande, Rohit. "Search for gas giants around late-M dwarfs." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4640.

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The absolute radial and rotational velocities of our targets were also calculated. Values of rotational velocities indicate that M dwarfs are, in general, slow rotators. Using our result and that from literature, we extended our study of rotational velocities to L dwarfs. Our observations show an increase in rotational velocities from late M to L dwarfs. We also find that the mean periods of M dwarfs are less than 10 hours. In order to improve our precision in measuring relative radial velocity (RV), we employed the use of deconvolution method. With this method we were able to ameliorate relat

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13

Lahti, Megan E. "The Status of Dwarfed Populations of Short-Horned Lizards (Phrynosoma hernandesi) and Great Plains Toads (Anaxyrus cognatus) in the San Luis Valley, Colorado." DigitalCommons@USU, 2010. https://digitalcommons.usu.edu/etd/809.

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The San Luis Valley is a large valley formation in Colorado surrounded on either side by mountain ranges exceeding 4,267 m. Within the Valley, two of the 14 amphibian and reptile species are dwarfed: the short-horned lizard (Phrynosoma hernandesi) and the Great Plains toad (Anaxyrus cognatus). Since its initial reporting in 1968 and confirmation in 1981, no research further investigating this dwarfism has been conducted. I collected morphological measurements to determine the extent and patterns of dwarfism of both species. I then investigated the genetics of both species using mitochondri

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14

Zhou, Yifan, Dániel Apai, Ben W. P. Lew, and Glenn Schneider. "A Physical Model-based Correction for Charge Traps in the Hubble Space Telescope’s Wide Field Camera 3 Near-IR Detector and Its Applications to Transiting Exoplanets and Brown Dwarfs." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/625388.

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The Hubble Space Telescope Wide Field Camera 3 (WFC3) near-IR channel is extensively used in time-resolved observations, especially for transiting exoplanet spectroscopy as well as. brown dwarf and directly imaged exoplanet rotational phase mapping. The ramp effect is the dominant source of systematics in the WFC3 for time-resolved observations, which limits its photometric precision. Current mitigation strategies are based on empirical fits and require additional orbits to help the telescope reach a thermal equilibrium. We show that the ramp-effect profiles can be explained and corrected with

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15

Hubeny, Ivan. "Model atmospheres of sub-stellar mass objects." OXFORD UNIV PRESS, 2017. http://hdl.handle.net/10150/624422.

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We present an outline of basic assumptions and governing structural equations describing atmospheres of sub-stellar mass objects, in particular the extrasolar giant planets and brown dwarfs. Although most of the presentation of the physical and numerical background is generic, details of the implementation pertain mostly to the code COOLTLUSTY. We also present a review of numerical approaches and computer codes devised to solve the structural equations, and make a critical evaluation of their efficiency and accuracy.

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16

Hardegree-Ullman, Kevin Karlyle. "Kepler Planet Occurrence Rates for Mid-Type M Dwarfs as a Function of Spectral Type." University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1533214839813619.

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17

Beatty, Thomas G. "Extrasolar Planet Detection and Characterization With the KELT-North Transit Survey." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406116607.

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18

Ricci, L., H. Rome, P. Pinilla, S. Facchini, T. Birnstiel, and L. Testi. "VLA Observations of the Disk around the Young Brown Dwarf 2MASS J044427+2512." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/625755.

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We present multi-wavelength radio observations obtained with the VLA of the protoplanetary disk surrounding the young brown dwarf 2MASS J04442713+2512164 (2M0444) in the Taurus star-forming region. 2M0444 is the brightest known brown dwarf disk at millimeter wavelengths, making this an ideal target to probe radio emission from a young brown dwarf. Thermal emission from dust in the disk is detected at 6.8 and 9.1 mm, whereas the 1.36 cm measured flux is dominated by ionized gas emission. We combine these data with previous observations at shorter sub-mm and mm wavelengths to test the prediction

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19

Hallakoun, N., (许偲艺) S. Xu, D. Maoz, et al. "Once in a blue moon: detection of ‘bluing' during debris transits in the white dwarf WD 1145+017." OXFORD UNIV PRESS, 2017. http://hdl.handle.net/10150/625505.

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The first transiting planetesimal orbiting a white dwarf was recently detected in K2 data of WD 1145+017 and has been followed up intensively. The multiple, long and variable transits suggest the transiting objects are dust clouds, probably produced by a disintegrating asteroid. In addition, the system contains circumstellar gas, evident by broad absorption lines, mostly in the u' band, and a dust disc, indicated by an infrared excess. Here we present the first detection of a change in colour of WD 1145+017 during transits, using simultaneous multiband fast-photometry ULTRACAM measurements ove

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20

Murcia, Riaño Nubia. "DETECCIÓN Y CARACTERIZACIÓN AGRONÓMICA DE VIROIDES DE CÍTRICOS. IDENTIFICACIÓN Y CARACTERIZACIÓN MOLECULAR Y BIOLOGÍCA DE VARIANTES DEL VIROIDE DEL ENANISMO DE LOS CÍTRICOS CDVd." Doctoral thesis, Universitat Politècnica de València, 2009. http://hdl.handle.net/10251/6343.

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Los cítricos son huéspedes naturales de diferentes especies de viroides, todos pertenecientes a la familia Pospiviroidae. Estudios preliminares para detectar viroides en especies y variedades comerciales dieron resultados erráticos, excepto cuando se utilizaba la especie indicadora cidro Etrog como huésped bioamplificador. Para evitar el uso de este huésped en los ensayos de detección, se desarrolló un método basado en la hibridación northern. El protocolo desarrollado consistía en: (i) extracción de ácidos nucleicos de muestras de corteza recolectadas en diferentes épocas y/o almacenadas en d

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21

van, Hooijdonk Benedict Michael. "The physiological basis of vigour control by apple rootstocks - an unresolved paradigm : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Plant Physiology at Massey University, Palmerston North, New Zealand." Massey University, 2009. http://hdl.handle.net/10179/1137.

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For millennia, scions have been grafted onto dwarfing apple rootstocks to reduce final tree size. However, it is unclear how scion architecture is first modified by the dwarfing apple rootstock, the time from grafting when this occurs and the endogenous hormonal signalling mechanisms that may cause the initial modifications in growth that then define the future architecture of the scion. In this study, the dwarfing (M.9) rootstock significantly decreased the mean total shoot length and node number of ‘Royal Gala’ apple scions by the end of the first year of growth from grafting when compared w

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22

Astudillo-Defru, Nicola. "Recherche de planètes habitables autour de naines M." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAY022/document.

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Depuis la première détection d'une planète extrasolaire autour d'une étoile de type solaire par Mayor et Queloz (1995), plus de 1500 planètes ont été découverts. Actuellement il existe un énorme intérêt à découvrir et caractériser des planètes semblables à la Terre, en particulier celles situées dans la zone habitable de leur étoile hôte (définie comme la distance à l'étoile hôte où la température de la planète permet l'existence d'eau liquide à la surface). La détection de planètes de type terrestre, et la recherche de biomarqueurs dans leurs atmosphères sont parmi les principaux objectifs de

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23

Soares, Bárbara Maria Teixeira Basto. "Composition of terrestrial planets orbiting M dwarfs." Master's thesis, 2021. https://hdl.handle.net/10216/138036.

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24

Heller, René [Verfasser]. "Theoretical studies on brown dwarfs and extrasolar planets / verf. von René Heller." 2010. http://d-nb.info/1009324217/34.

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25

Hermes, James Joseph Jr. "A search for periodic variations in pulse arrival times in DA white dwarfs." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-08-1998.

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We present updated observations of a pilot survey of 14 pulsating DA white dwarfs, monitored for evidence of center-of-mass motion caused by a planetary companion. We have nearly doubled the number of periodicites for which we can produce O-C diagrams that document pulse arrival times from our stars, and have implemented a method to minimize the apertures we use in our reductions in order to reduce sky noise. In addition to a previously published candidate, GD66, we have identi fed at least four more systems worthy of rigorous observational follow-up. We have also implemented a method, a gen

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26

Tang, T. "Physiological and genetic studies of an alternative semi-dwarfing gene Rht18 in wheat." Thesis, 2016. https://eprints.utas.edu.au/23074/1/Tang_whole_thesis_ex_prop_mat.pdf.

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Conventional semi-dwarfing genes Rht-B1b and Rht-D1b have successfully improved grain yield of wheat. This study investigates the physiology and genetics of a new semi-dwarfing gene, Rht18. Isogenic lines including Tall, semi-dwarf (Rht-D1b/B1b or Rht18) and Double dwarf (Rht18+Rht-D1b/B1b) were developed. There was no difference in developmental stage between semi-dwarfs from the time of terminal spikelet to maturity. However, Rht18 slowed the growth of the spike and distal internodes to reduce plant height by 20-35% compared with Tall lines. Dry matter was relocated from the stem to the spik

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27

Thies, Ingo [Verfasser]. "On the origin and nature of brown dwarfs and massive planets / vorgelegt von Ingo Thies." 2011. http://d-nb.info/1014092701/34.

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28

Su-Feng, Roan, and 阮素芬. "Investigation and Evaluation of Plant Character and Establishment of Dwarfing Pear Selection Model of ''Bird'' Pear Seedlings (Pyrus. sp.)." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/48797221669736190344.

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博士<br>國立臺灣大學<br>園藝學研究所<br>88<br>Investigation and Evaluation of Plant Characters and Establishment of Dwarfing Pear Selection Model of ‘Bird’ Pear Seedlings (Pyrus sp.) Abstract Open pollinated ''Bird'' pears were collected from Chuo-lan, Da-hu and San-wan for a series of experiments. The experiments were to be conducted by the order of (1) to survey fruit characters, (2) to conduct seed germination experiment, (3) to survey and assess the growth and the development of the seedling, (4) to evaluate the stability and relationship between plant height and other plant

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29

(6714896), Xiangying Mao. "INVESTIGATING THE FUNCTIONAL ROLE OF MED5 AND CDK8 IN ARABIDOPSIS MEDIATOR COMPLEX." Thesis, 2019.

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<p>The Mediator (Med) complex comprises about 30 subunits and is a transcriptional co-regulator in eukaryotic systems. The core Mediator complex, consisting of the head, middle and tail modules, functions as a bridge between transcription factors and basal transcription machinery, whereas the CDK8 kinase module can attenuate Mediator’s ability to function as either a co-activator or co-repressor. Many Arabidopsis Mediator subunit has been functionally characterized, which reveals critical roles of Mediator in many aspects of plant growth and development, responses to biotic and abiotic stimuli

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30

Ingraham, Patrick. "Détection et caractérisation de naines brunes et exoplanètes avec un filtre accordable pour applications dans l'espace." Thèse, 2013. http://hdl.handle.net/1866/9194.

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Cette thèse porte sur la capacité à détecter des compagnons de faible intensité en présence de bruit de tavelures dans le contexte de l’imagerie à haute gamme dynamique pour l’astronomie spatiale. On s’intéressera plus particulièrement à l’imagerie spectrale différentielle (ISD) obtenue en utilisant un étalon Fabry-Pérot comme filtre accordable. Les performances d’un tel filtre accordable sont présentées dans le cadre du Tunable Filter Imager (TFI), instrument conçu pour le télescope spatial James Webb (JWST). La capacité de l’étalon à supprimer les tavelures avec ISD est démontrée expériment

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