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Teses / dissertações sobre o tema "Photoperiodism"

Autor: Grafiati
Publicado: 4 de junho de 2021
Última modificação: 25 de julho de 2025

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1

Last, Kim Sven. "Photoperiodism in the semelparous polychaete Nereis virens sars." Thesis, University of Newcastle Upon Tyne, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324943.

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2

O’Brien, Conor Savage. "Evolution of Photoperiodism in the Threespine Stickleback Gasterosteus aculeatus." Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/12104.

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xvi, 112 p. : ill. (some col.)<br>In seasonal environments, the ability to take advantage of the favorable seasons and avoid or mitigate the effects of the unfavorable ones is essential for organismal fitness. Many polar and temperate organisms use photoperiod (length of day) to time seasonal life history events because photoperiod's regular annual cycle makes it a very reliable indicator of seasonality. This reliability allows organisms to anticipate and properly prepare for seasonal change. Although photoperiodism is widespread in polar and temperate vertebrates, little is known relative to
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3

Robertson, Carol Elaine. "The use of quantitative RT-PCR techniques to examine the expression of PHY-genes : the role of phytochrome A in the photoperiodic induction of flowering in the long-day-plant Sinapis alba and the short-day-plant Pharbitis nil." Thesis, University of Reading, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282609.

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4

Sáenz, de Miera Cristina. "The role of photoperiodic history and internal long-term timing in seasonal neuroendocrinology." Thesis, University of Aberdeen, 2014. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=225273.

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Seasonal physiology has evolved as an adaptive strategy to changing environments with daylength (photoperiod) used as the predominant environmental cue to suit breeding and other functions to the external season. However, seasonal physiological state is determined not only by the photoperiod that is currently in effect but also by the animal's history, allowing changes in physiology in anticipation to the seasons. Many mammals and birds show internally timed, long-term (circannual) changes in seasonal physiology, synchronised to the seasons by changing photoperiods. The importance of history-d
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5

Holm, Karl. "Studies on Natural Variation and Evolution of Photoperiodism in Plants." Doctoral thesis, Uppsala universitet, Evolutionär funktionsgenomik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-119269.

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Photoperiodism refers to the organism’s ability to detect and respond to seasonal changes in the daily duration of light and dark and thus constitutes one of the most significant and complex examples of the interaction between the organism and its environment. This thesis attempts to describe the prevalence of variation in a photoperiodic response, its adaptive value, and its putative genetic basis in a common cruciferous weed, Capsella bursa-pastoris (Brassicaceae). Furthermore, the thesis presents a first comprehensive comparative overview of the circadian clock mechanism in an early land pl
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6

Tan, Ying. "Neurospora crassa - A model system for photoperiodism and circadian rhythm research." Diss., lmu, 2003. http://nbn-resolving.de/urn:nbn:de:bvb:19-47324.

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7

Andersson, Håkan. "Photoperiodism in pigs : studies on timing of male puberty and melatonin /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2000. http://epsilon.slu.se/v90.pdf.

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8

Yang, Jingying. "Photoperiodism and endocrine control of reproduction in the Turkey (Meleagris gallopavo) /." The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487952208107354.

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9

LUBBERS, EDWARD LAWRENCE. "CHARACTERIZATION AND INHERITANCE OF PHOTOPERIODISM IN GUAR, CYAMOPSIS TETRAGONOLOBA (L.) TAUB." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184079.

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Three hundred and thirty lines of guar (Cyamopsis tetragonoloba (L.) taub.) were planted in five locations throughout central and southwestern United States to find diverse photoperiod response types for closer physiological and genetic study. Dates of planting studies were done in 1982 and 1983 in hopes that the photoperiod responses would be obvious in field conditions but they were not. The 1982 dates of planting studies in Arizona, Kansas, and Texas indicated that the date of planting was more important than the selection of cultivar in expectations of high yield even though cultivar selec
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10

Mathias, Derrick Kenneth. "The evolution of a seasonal adaptation in the pitcher-plant mosquito, Wyeomyia smithii /." view abstract or download file of text, 2006. http://proquest.umi.com/pqdweb?did=1276394641&sid=1&Fmt=2&clientId=11238&RQT=309&VName=PQD.

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Thesis (Ph. D.)--University of Oregon, 2006.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 96-103). Also available for download via the World Wide Web; free to University of Oregon users.
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11

Mendez, Jocelyn V. "Comparison of photoperiod-sensitive and photoperiod-insensitive oat genotypes." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23921.

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Two experiments were conducted in 1994 and 1995 to compare the field performance of photoperiod sensitive (PS) and photoperiod insensitive (PI) oat (Avena sativa L) genotypes. In the first experiment, bulks of PS and PI lines from four covered oat crosses, as well as the cultivars Sylva, Newman, the PI naked oat cultivar AC Lotta and the breeding line NO820-3L were tested at seven locations across Quebec and Ontario. The second experiment was a seeding. date trial performed at Ste-Anne-de-Bellevue in which individual PS and PI lines of three covered oat crosses were utilized. In the multi-loca
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12

De, Caluwe Joelle. "Modeling the plant circadian clock: a study of light, photoperiodism, and growth." Doctoral thesis, Universite Libre de Bruxelles, 2017. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/251373.

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Le travail présenté dans cette thèse consiste en la création et l'étude des propriétés d'un nouveau modèle computationnel de l'horloge circadienne végétale et de certains processus physiologiques qui en dépendent.L'horloge circadienne est un rythme endogène d'une période d'environ 24 heures que possèdent la plupart des êtres vivants. Il est généré au niveau moléculaire par des boucles de rétroaction transcriptionnelles, traductionnelles et/ou post-traductionnelles. L'horloge permet aux organismes de s'a- dapter à leur environnement. L'horloge des plantes se distingue par un nombre important de
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13

Emerson, Kevin James. "Evolutionary and physiological genetics of biological timing /." Connect to title online (Scholars' Bank) Connect to title online (ProQuest), 2009. http://hdl.handle.net/1794/10286.

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14

Duncan, Neil. "Photoperiodic manipulation and its use in the all year round production of Atlantic salmon, Salmo salar." Thesis, University of Stirling, 1996. http://hdl.handle.net/1893/21632.

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The Atlantic salmon (Salmo salar) has two developmental processes which are clearly seasonal; smoltification is restricted to the spring and maturation to late autumn. In the farming industry the seasonality of juvenile production is primarily responsible for the seasonal production in market-sized fish. Both smoltification and maturation appear to be controlled by mechanisms timed by photoperiod. This thesis investigates the effects of photoperiod on smoltification and maturation. The performance of both out-of-season eggs and particularly smolts are closely examined and the possible applicat
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15

HAUSER, URSULA ESTHER. "PHOTOPERIODIC REGULATION OF THE FEMALE REPRODUCTIVE SYSTEM IN THE SYRIAN HAMSTER (OVARY, PINEAL, HORMONES, PITUITARY)." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183862.

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Female golden Syrian hamsters are seasonally breeding animals, capable of maintaining continuous estrous cycles when the daylength is 12.5 hrs. or longer. In shorter photoperiod (SP) the ovaries of anovulatory animals are characterized by few small growing follicles, an absence of corpora lutea and extensive hypertrophied interstitium. Steroid-histochemical studies revealed that enzymes related to steroidogenesis show intense activity in the interstitial tissue of SP-exposed animals. The major objectives of these studies were to examine SP-induced hormonal and ovarian changes which occur prior
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16

Murphy, Andrew James. "Calmodulin as a regulator of circadian clock function and photoperiodic flowering in Arabidopsis thaliana." Thesis, University of Exeter, 2009. http://hdl.handle.net/10036/99353.

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Discrete changes in the amplitude, frequency, and cellular localisation of calcium ion (Ca2+) transients encode information about numerous stimuli and function to mediate stimulus-specific responses. Cytoplasmic Ca2+ (Ca2+cyt) undergoes circadian oscillations in concentration that appear to be under the control of the same endogenous oscillator that regulates expression of genes in the photoperiodic-flowering pathway. It is currently not known whether these circadian [Ca2+cyt] oscillations are biochemical artefacts or are decoded and function to transduce clock dependent responses. Calmodulin
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17

DePatie, Nicholas. "Expression of Core Circadian Clock Genes Unable to Explain Changes in the Photoperiodic Timer Across Latitudinal and Altitudinal Gradients in Wyeomyia smithii." Thesis, University of Oregon, 2018. http://hdl.handle.net/1794/23149.

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Photoperiodism is the ability of plants and animals to utilize day length or night length to mitigate seasonal exigencies. The circadian clock allows organisms to organize daily demands. Both process are set by light, and for more than 80 years a functional relationship has been pursued. Previous experiments have revealed, through phenotypic expression, that the daily circadian clock and seasonal photoperiodic timer have evolved independently, yet molecular evidence is lacking. Herein, we use the mosquito, Wyeomyia smithii, to understand the relationship between the photoperiodic response, dia
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18

Lee, Chee Wee. "The effects of photoperiod on reproductive performance of turkey males /." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63294.

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19

McStay, Elsbeth. "Photoperiod regulation of molecular clocks and seasonal physiology in the Atlantic salmon (Salmo salar)." Thesis, University of Stirling, 2012. http://hdl.handle.net/1893/11012.

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Recent years have seen considerable advances in the study of biological rhythms and the underlying molecular mechanisms that drive the daily and seasonal physiology of vertebrates. Amongst teleosts the majority of work in this field has focused on the model species the zebrafish to characterise clock genes and the molecular feedback loop that underpins circadian rhythms and physiology. Daily profiles of clock gene expression in a wide variety of tissues and cell types are now relatively well described. However the zebrafish is a tropical species that does not display distinct seasonality and t
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20

Chapman, Brent Maynard. "The effects of photoperiod, pinching, and plant growth regulators on growth and flowering of Abutilon x hybridum." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/101174.

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<i>Abutilon</i> x <i>hybridum</i>, flowering maple has the potential to become a profitable floriculture crop. However, growing guidelines need to be developed in order to produce a proportional, well-branched, and uniform-flowering pot plant. The objective of this research project was to form a foundation on which a commercial growing program could be developed. Growing flowering maple under short-day conditions (SD) significantly reduced plant height. Plants grown under SD were nearly half as tall as those plants grown under long-day conditions (LD). Also, plants grown under SD flowered an
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21

Ikeda, Kento. "Role of the clock gene period in the circadian rhythm and photoperiodism of the silkmoth Bombyx mori." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/264645.

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22

McAllan, B. M. "The regulation of seasonal reproductive cycles in "Antechinus" : photoperiodic and pineal correlates /." Title page, contents and abstract only, 1987. http://web4.library.adelaide.edu.au/theses/09SM/09smm114.pdf.

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23

Sprague, Matthew. "Environmental influences on the physiological and behavioural growth responses in salmonids : with reference to the growth-dip phenomenon." Thesis, University of Stirling, 2006. http://hdl.handle.net/1893/212.

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Photoperiod manipulations are widely used throughout the Atlantic salmon (Salmo salar) farming industry as a means of producing a product of uniform quality all-year round. However, farmers still remain sceptical over their effectiveness to regulate growth and maturation during the on-growing stage. Furthermore, reports of a characteristic growth-dip following light exposure suggest that light may negatively affect the physiological performance of fish in the short-term. Thus, this thesis investigates the effects of light characteristics (spectral quality, intensity and photoperiod) on growth
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24

De, Jager Pieter Herodes. "Effect of photoperiod on sexual development, growth and production of quail (coturnix coturnix japonica)." Thesis, Port Elizabeth Technikon, 2003. http://hdl.handle.net/10948/227.

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The aim of the study was to determine the effect of photoperiod on production of quail in South Africa. Day old chicks were randomly divided into two groups. One group (n=74) received continuous light (LL) while the other group (n=77) received 13 h of light (LD) per day. Traits measured were sexual characteristics (age at sexual maturity and testis weight, egg production and egg weight) and growth (body weight) development in males and females respectively. Significant differences in growth existed between sexes; females were 171.44±17.15 and 182.91±17.75 g compared to the 151.77±13.20 and 155
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25

Rondon, Josimara Nolasco. "Autoecologia de Bauhinia holophylla Steud. (Leguminosae-Caesalpiniolideae), na Reserva Biologica e Estação Experimental de Moji Guaçu, SP." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/315250.

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Orientador: Lilian Beatriz Penteado Zaidan<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Biologia<br>Made available in DSpace on 2018-08-07T09:17:44Z (GMT). No. of bitstreams: 1 Rondon_JosimaraNolasco_D.pdf: 1536546 bytes, checksum: 297d7328b9b2a132fca75bfad73844c8 (MD5) Previous issue date: 2006<br>Resumo: Uma população de Bauhinia holophylla Steud. localizada no cerrado sensu stricto da Reserva Biológica e Estação Experimental de Moji Guaçu (RBEE de Moji Guaçu) foi estudada quanto a sua fenologia reprodutiva, expectativa de vida foliar, predação de sementes, germina
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26

Chew, Yin Hoon. "Multi-scale whole-plant model of Arabidopsis growth to flowering." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8008.

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In this study, theoretical and experimental approaches were combined, using Arabidopsis as the studied species. The multi-scale model incorporates the following, existing sub-models: a phenology model that can predict the flowering time of plants grown in the field, a gene circuit of the circadian clock network that regulates flowering through the photoperiod pathway, a process-based model describing carbon assimilation and resource partitioning, and a functional-structural module that determines shoot structure for light interception and root growth. First, the phenology model was examined on
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27

Konagaya, Tatsuro. "Ecophysiological study on the alternative life cycles of males in the Japanese common grass yellow Eurema mandarina." Kyoto University, 2018. http://hdl.handle.net/2433/232289.

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28

Matsuda, Naoki. "Physiological study on the transgenerational timing mechanism in an aphid." Kyoto University, 2020. http://hdl.handle.net/2433/253117.

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29

Gillanders, S. W. "A comparison of the circadian control of locomotor activity and photoperiodism in Drosophila melanogaster, wild-type and period mutants." Thesis, University of Edinburgh, 1993. http://hdl.handle.net/1842/14915.

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Mutant <i>Drosophila melanogaster</i> flies with drastically altered free-running periods of locomotor activity (<i>period</i> mutants) were used to investigate the relationship between circadian control of overt rhythm production and photoperiodic time measurement. Comparison of the free-running rhythms of wild-type, short period and long period mutants revealed that alterations in this periodicity resulted from a decrease in the active phase (short <i>period</i> mutant) or an increase in the inactive phase (long <i>period</i> mutant) when compared with wild-type. Light phase response curves
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30

Johnson, Kerry. "Photoperiod induction, Gibberellic acid, mulch and row cover effects on fresh cut flower production of three Rudbeckia hirta L. cultivars." Diss., Mississippi State : Mississippi State University, 2006. http://sun.library.msstate.edu/ETD-db/ETD-browse/browse.

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31

Al-Khamees, Sami A. "Photoperiod effects on circadian rhythms and puberty onset in African catfish Clarias gariepinus." Thesis, University of Stirling, 2009. http://hdl.handle.net/1893/1819.

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Photoperiod manipulation is routinely used in the aquaculture industry with the aim to enhance growth by manipulating the timing of reproduction in several commercially important temperate fish species. However, there are clear gaps in our understanding of how photoperiod is perceived by the circadian axis and transmitted to the brain to alter reproduction. Furthermore, due to the wide range of environments inhabited by fish, it is unlikely that one single organization exists. It is therefore believed that comparative studies of temperate species “models” with tropical species such as the Afri
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32

Taylor, John Frank. "The effects of photoperiod manipulation on growth and reproduction in rainbow trout (Oncorhynchus mykiss)." Thesis, University of Stirling, 2004. http://hdl.handle.net/1893/12323.

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Photoperiod is an important signal involved in the timing and co-ordination of many processes such as growth and reproduction in salmonids. Both growth and reproduction appear to be controlled by endogenous rhythms, which under natural conditions, is entrained by the seasonal changes in daylength, that is accurately reflected by the diel pattern of melatonin. This thesis investigates the influence of photoperiod on growth and reproduction in rainbow trout (Oncorhynchus mykiss), and examines the effect on plasma insulin-like growth factor-I (IGF-I). These studies aim to further our scientific u
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33

Rutterford, Zoë Susan. "The barley circadian clock in relation to photoperiod response." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609468.

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34

Magiero, Emanuelle Cavazini. "Fisiologia da floração e atividade alelopática de Artemisia annua L. cultivar Artemis cultivada em clima subtropical úmido." Universidade Tecnológica Federal do Paraná, 2009. http://repositorio.utfpr.edu.br/jspui/handle/1/237.

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A Artemisia annua L. (Asteraceae) é uma planta herbácea, nativa da Ásia e aclimatada no Brasil. As folhas apresentam até 1,4% do peso seco em artemisinina, sendo fonte abundante desta lactona sesquiterpênica que, conjuntamente aos seus derivados semi-sintéticos, apresentam ação efetiva contra as cepas resistentes das espécies de Plasmodium causadoras da malária. A artemisinina também está sendo testada com sucesso no tratamento de câncer e apresenta-se efetiva contra inúmeros parasitas que afetam a saúde humana e animal. Os objetivos deste trabalho foram determinar as épocas de plantio e colhe
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35

Doong, Tzyy-Jye. "Regulation of Gibberellin Metabolism by Environmental Factors in Arabidopsis Thaliana." Columbus, Ohio : Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1034085989.

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Thesis (Ph. D.)--Ohio State University, 2002.<br>Title from first page of PDF file. Document formatted into pages; contains xi, 148 p.; also contains graphics (some col.). Includes abstract and vita. Advisor: James Metzger, Dept. of Horticulture and Crop Science. Includes bibliographical references (p. 132-148).
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36

Covington, Michael Fulton. "ELF3 and the light resetting mechanism of the circadian clock in Arabidopsis thaliana /." view abstract or download file of text, 2002. http://wwwlib.umi.com/cr/uoregon/fullcit?p3061940.

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37

Doyle, Alice. "Understanding maturity : insights into the mechanisms underpinning maturity in gadoids." Thesis, University of Stirling, 2016. http://hdl.handle.net/1893/25265.

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Marked shifts in the life history traits of fish have been reported in many exploited fish stocks, with a particular trend towards decreasing size and age at maturity. Though other environmental and behavioural factors have been implicated, the key driver of these changes links to fishing pressure, through both the direct selective effects of fishing itself, and indirectly through the manipulation of important biological and environmental factors. Although reproduction itself has been well described in teleosts, the mechanisms of environmental and endogenous entrainment of maturation remain un
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38

Corrêa, Simone Toni Ruiz. "Adaptação do modelo LINTUL (Light Interception and Utilization) para estimação da produtividade potencial da cultura de soja." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/11/11136/tde-11022009-100352/.

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Em 2007 o complexo de soja foi responsável por 19 por cento do total das exportações do agronegócio brasileiro, gerando mais de U$11 bilhões em divisas. Projeções indicam que até 2020 o Brasil deverá produzir 105 milhões de toneladas de soja, ou 81 por cento a mais do que a atual produção. Apesar de incidir sobre a produtividade a maior expectativa de crescimento, espera-se que a expansão significativa em área ocorra nas regiões de baixa latitude dos Cerrados, e em especial, no estado do Mato Grosso. É fundamental a determinação de estratégias que considerem produção, dimensões econômicas e am
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Weil, Zachary M. "Social And Temporal Determinants Of Brain, Behavior And Immune Function." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1219085420.

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40

FANTINI, ELIO. "Genetic selection for flowering time traits during speciation of tomato." Doctoral thesis, Università degli Studi di Verona, 2010. http://hdl.handle.net/11562/343262.

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SINTESI Negli ultimi dieci anni, un network di informazioni sulla famiglia delle Solanacee è stato creato all’interno progetto internazionale SOL (International Solanaceae Genome Project), il cui scopo finale è quello di spiegare come un insieme comune di geni/proteine può portare a una vasta gamma di organismi morfologicamente e ecologicamente distinti come quelli della famiglia delle Solanacee. Questo taxon comprende più di 3000 specie, molte delle quali si sviluppano nella regione andina- amazzonica dell’America meridionale. Il loro habitat varia enormemente, dalle foreste pluviali ai des
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41

Hoffman, Christopher John. "THE EFFECT OF PHOTOPERIOD AND TEMPERATURE UPON ADULT ECLOSION OF THE SWEETPOTATO WHITEFLY, BEMISIA TABACI (GENNADIUS)." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275371.

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42

Martinez, Chavez Carlos Cristian. "Photic Entrainment and onset of puberty in Nile tilapia Oreochromis niloticus niloticus." Thesis, University of Stirling, 2008. http://hdl.handle.net/1893/354.

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Despite teleosts being the largest and most diverse group of vertebrates, fish models currently used to study photoperiodic effects on fish physiology have been limited to a few species, most of which are temperate seasonal breeders. The overall aim of this work was to expand our knowledge on circadian biology and environmental physiological effects in Nile tilapia (Oreochromis niloticus niloticus), a continuous breeding species of tropical-subtropical origin. The circadian light axis of Nile tilapia is described with regards to melatonin production. Circadian melatonin profiles of fish under
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43

Davie, Andrew. "Effects of photoperiod manipulation on growth and reproduction in Atlantic cod (Gadus morhua L.)." Thesis, University of Stirling, 2005. http://hdl.handle.net/1893/109.

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Sexual maturation during commercial culture of Atlantic cod (Gadus morhua L.) represents a significant production bottleneck restricting the profitability of the industry. Such problems in other species have traditionally been addressed by artificial manipulation of photoperiod cycles, however little research exists in this field in cod. This thesis therefore investigates the interactions between artificial photoperiod manipulation, sexual maturation and somatic growth in this species. In the first experiment, populations of Atlantic cod (hatched, spring 1999) were maintained on either a simul
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44

Earl, Colin R. "The regulation of the timing of melatonin secretion in the sheep." Title page, summary and table of contents only, 1989. http://web4.library.adelaide.edu.au/theses/09PH/09phe12.pdf.

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Includes bibliographical references (leaves 166-195) Addresses the nature of the central mechanisms involved in the regulation of the circadian pattern of secretion of the pineal hormone melatonin in the highly seasonal Suffolk breed of sheep. Provides new information on the behaviour of the onset and offset of melatonin secretion under different photoperiodic conditions.
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Lara, Márcio André Stefanelli. "Respostas morfofisiológicas de genótipos de Brachiaria spp. sob duas intensidades de desfolhação e modelagem da produção de forragem em função das variações estacionais da temperatura e fotoperíodo: adaptação do modelo CROPGRO." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/11/11139/tde-24052011-093743/.

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Para poder compreender e descrever o crescimento das plantas forrageiras é necessário ter conhecimento acerca de seus aspectos agronômicos e morfofisiológicos e suas respostas aos fatores edafoclimáticos. O desenvolvimento de ferramentas que viabilizem a racionalização dessas inter-relações é de grande importância para a comunidade científica, ao facilitar a explicação da dinâmica do crescimento, e para o pecuarista dando opções de planejamento e auxílio à tomada de decisão na propriedade pecuária. O objetivo deste trabalho foi avaliar as respostas agronômicas e morfofisiológicas de cinco genó
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Martín, Matas Guiomar. "Identification of suppressors of the constitutive photomorphogenic phenotype of pifq: from chloroplasts to rhythmic growth." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/350563.

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Plants germinated in the dark under the soil surface, undergo skotomorphogenic development. Once they emerge from the soil surface perceive light for the first time. Then, seedlings switch from skotomorphogenic to photomorphogenic development, a process that is known as seedling deetiolation. At this moment, seedlings rapidly form the photosynthetic apparatus to start to produce energy and avoid photodamage. In addition, seedlings adapt their morphology to enhance light capture for photosynthesis, inhibiting hypocotyl elongation and stimulating cotyledon separation and expansion. At the molecu
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Williamson, Michelle Leigh. "Differential responses of tillers to floral induction in perennial ryegrass (Lolium perenne L.) : implications for perenniality : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Plant Biology at Massey University, Palmerston North, New Zealand." Massey University, 2008. http://hdl.handle.net/10179/842.

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Development of sustainable practices is an important goal in agriculture. One possibility involves the development of perennial cereal crops, but the mechanisms of perenniality first need to be understood. While in annual cereals flowering structures die following seed production, in perennial grasses, perenniality is achieved by maintaining at least one shoot in a vegetative state. There are two views on perennating tiller origin in perennial grasses: some authors suggest that all over-wintering tillers flower in spring and summer, leaving spring-initiated tillers to perennate, while others i
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Berghauer, Erika Mary. "Photoperiodic response of commercial calibrachoa cultivars." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0007015.

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Carvalho, Rogério Falleiros. "Uso de mutantes fotomorfogenéticos no estudo da competência para regeneração in vitro em micro-tomateiro (Lycopersicon esculentum CV Micro-Tom." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/11/11144/tde-19022004-103113/.

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Paralelamente ao modelo Arabidopsis thaliana, o tomateiro (Lycopersicon esculentum) tem sido crescentemente utilizados em abordagens genéticas de questões fisiológicas. Uma das principais vantagens de Arabidopsis como “planta de laboratório” tem sido seu pequeno porte e ciclo de vida curto. Contudo, a cultivar Micro-Tom (MT) de tomateiro possui tamanho muito reduzido (8 cm) e pode produzir até 5 gerações por ano. Mutantes fotomorfogenéticos em tomateiro deficientes na síntese do cromóforo do fitocromo (au), mutantes deficientes na síntese das apoproteínas PHYA e PHYB1 (fri e tri, respec
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Clokie, Benjamin Gregory James. "Impact of lighting conditions on the developmental physiology of Atlantic salmon (Salmo salar)." Thesis, University of Stirling, 2017. http://hdl.handle.net/1893/27240.

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The Atlantic salmon (Salmo salar) lifecycle is punctuated by distinct ontogenic stages which are routinely manipulated commercially by photoperiod regimes to enable year-round production. As such, light plays a critical role throughout the production cycle, however, it remains poorly characterised and light spectrum and intensity have not been defined optimally yet. This thesis was therefore set out to test the effects of narrow bandwidth light (Blue-&lambda;(max) 444 nm, Green-&lambda;(max) 523 nm, Red-&lambda;(max) 632 nm and White) and intensity in freshwater (FW). Fry-parr development, out
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