Thesis (M.S.)--Montana State University--Bozeman, 2005. / Typescript. Chairperson, Graduate Committee: Jeffrey C. Mosley. Includes bibliographical references (leaves 525-59).

Thesis (Ph.D.) - University of Queensland, 2005. / Includes bibliography.

Thesis (M.S.)--University of Missouri-Columbia, 2004. / Typescript. Includes bibliographical references. Also available on the Internet.

Thesis (M. Sc. (Zoology and Entomology))--Rhodes University, 2006.

Thesis (Ph.D. (Zoology and Entomology)) - Rhodes University, 2007.

Thesis (M.Sc.(Agric.))(Plant Production)--University of Pretoria, 2006. / Includes bibliographical references. Available on the Internet via the World Wide Web.

The thesis describes characteristics of rapeseed and its life cycle. Its main objective is to approach the problematics of weeds in the spring formo of rapeseed on the lands of agricultural company AGRO Dolní Bukovsko. Small-plot experiment was founded on cadastral area Bzí near Dolní Bukovsko, in direction to Týn nad Vltavou. The problems in cultivation of cultural plants are caused by weeds, which are negatively affecting the quality of production as well as the economics of cultivation. Evaluation of weeds was carried out by the counting method in the period since March to August 2016. Number of the weed plants which were found on the particular location was regularly registered and evaluated. In the conclustion it is possible to state that long-term regulation of weed occurence has to be undertaken in time, thoroughly and has to be based on complete protection. Complete protection consists of direct and indirect methods of regulation. As one of the many but most effective possibilities it is possible to use herbicide preparations

The aim of this thesis is to expand knowledge about how to control very dangerous weeds occurring on arable land in forests grown rapeseed. When growing crops are placed great demands on the quality of both production and the economy growing. Modern technologies of cultivation and the production system measures its influence reached the amount of seeds and harvest quality. The possibility of using herbicides to control the occurrence of plant very dangerous weed species in stands grown at conventional oilseed farming is offered as one of the many and very effective control measures against the occurrence of monocot and dicotyledonous weeds.

Made available in DSpace on 2015-05-14T16:53:07Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-12-12Bitstream added on 2015-05-14T16:59:24Z : No. of bitstreams: 1 000819494.pdf: 730304 bytes, checksum: c24a03c0d2e555a0ddbac4bad206675a (MD5) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / Durante o processo de germinação da semente várias enzimas estão presentes em reações metabólicas importantes durante a respiração, como por exemplo, malato desidrogenase e álcool desidrogenase. Além disso, para que a germinação aconteça, são necessárias a expansão e a posterior divisão das células do embrião, nesses processos estão envolvidos os genes actina e ciclina, respectivamente. São importantes ainda, os mecanismos de proteção das sementes contra estresses abióticos durante a germinação, dentre eles podem ser citadas a presença de proteínas de choque térmico, relacionadas com a tolerância à dessecação e de enzimas como a glutationa-S-transferase, consideradas antioxidantes. Objetivou-se com este estudo avaliar o perfil de expressão de genes associados com a respiração, citoesqueleto, ciclo celular e estresse no embrião de sementes de Solanum lycocarpum durante a germinação. As sementes de lobeira foram avaliadas com relação a sua qualidade fisiológica, determinando-se: porcentagem de germinação, índice de velocidade de germinação, tempo médio de germinação, frequência de germinação. Além disso, determinou-se uma curva de embebição. O RNA do embrião das sementes foi extraído aos 1, 5, 10 e 15 dias de embebição em água seguido da síntese de cDNA. A expressão gênica foi realizada usando-se a técnica de PCR em tempo real. Os genes estudados no embrião foram malato desidrogenase (MDH), álcool desidrogenase (ADH2), actina (ACT7), ciclina (CDC2), proteína de choque térmico (HSPS17.6), glutationa-S-transferase (GST). A partir dos resultados obtidos conclui-se que, durante o processo de germinação de sementes de lobeira, existe variação no perfil de expressão de ... / During the process of seed germination various enzymes are present in important metabolic reactions during respiration, such as malate dehydrogenase and alcohol dehydrogenase. In addition, for germination to take place, is necessary expansion and subsequent division of the cells of the embryo, which requires the involved of the genes cyclin and actin, respectively. Mechanisms associated with seed protection against abiotic stresses during germination, among which may be mentioned is the presence of heat shock proteins related to desiccation tolerance and enzymes such as glutathione-S-transferase, considered as antioxidant. The aim of this study was to evaluate the expression profile of genes associated with respiration, cytoskeleton, cell cycle and stress in the embryo of seeds of Solanum lycocarpum during germination. Lobeira seeds were evaluated with respect to their physiological quality, determining: germination percentage, speed of germination, means germination time, frequency of germination and was also given a curve of soaking. The RNA from the embryo of the seeds was extracted at 1, 5, 10 and 15 days of imbibitions in water, followed by cDNAS synthesis The gene expression was carried out using the technique of real time PCR. The genes studied in the embryo were malate dehydrogenase (MDH), alcohol dehydrogenase (ADH2) and actin (ACT7), cyclin (CDK2), heat shock protein (HSPS17.6), glutathione-S-transferase (GST). From the results obtained we concluded that, during the process of germination of lobeira, there is variation in the expression of genes associated with respiratory, stress protection and expansion and cell division

Made available in DSpace on 2015-05-14T16:53:28Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-11-28Bitstream added on 2015-05-14T16:58:47Z : No. of bitstreams: 1 000819421.pdf: 1106360 bytes, checksum: 5c77ecd7e8d903d4bd0d99105ccb5bbd (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Este estudo teve como objetivo avaliar o efeito da profundidade de semeadura e da intensidade luminosa na emergência e no crescimento de Acanthospermum australe, Urochloa decumbens, Urochloa humidicola, Urochloa plantaginea, Senna occidentalis, Senna obtusifolia, Cenchrus echinatus, Desmodium tortuosum, Euphorbia heterophylla, Ipomoea grandifolia, Ipomoea quamoclit, Raphanus raphanistrum e Sida rhombifolia. Cada espécie constituiu um experimento e o delineamento experimental utilizado foi o inteiramente casualizado, com quatro repetições. Os tratamentos foram dispostos em um esquema fatorial 6x4, sendo o fator A correspondente a seis profundidades de semeadura (0,5; 1,0; 2,0; 4,0; 8,0 e 12,0 cm) e o fator B quatro intensidades luminosas (100%, 70%, 50% e 30% da intensidade luminosa solar) obtidas através do uso de sombrites. Foi avaliada diariamente a capacidade de emergência das plântulas por um período de 26 dias a partir da semeadura para que se obtivesse a porcentagem de emergência e o Índice de Velocidade de Emergência (IVE). A altura das plantas e o tempo até a indução floral também foram avaliadas, além da massa seca das plantas no florescimento. As características pertinentes a cada tratamento de intensidade luminosa, como: a temperatura do ar, umidade relativa do ar e a temperatura do solo nas profundidades estudadas foram determinados, além da radiação fotossinteticamente ativa, que foi quantificada com um quantômetro. Todos os resultados foram submetidos a análises de variância pelo Teste F e as médias dos tratamentos comparadas pelo Teste de Tukey a 5% de probabilidade. As plantas de U. decumbens, U. plantaginea, C. echinatus, A. australe, S. occidentalis, S. obtusifolia, R. raphanistrum, I. grandifolia, I. quamoclit e E. heterophylla emergiram em semeaduras de até 12,0 cm de profundidade, enquanto as / This study aimed to evaluate the effect of sowing depth and light intensity on germination and growth of Acanthospermum australe, Urochloa decumbens, Urochloa humidicola, Urochloa plantaginea, Senna occidentalis, Senna obtusifolia, Cenchrus echinatus, Desmodium tortuosum, Euphorbia heterophylla, Ipomoea grandifolia, Ipomoea quamoclit, Raphanus raphanistrum and Sida rhombifolia. Each species represents an experiment, which conducted in a completely randomized design, with four replications. The treatments were arranged in a 6x4 factorial design, with the first factor corresponding to six different sowing depths (0.5, 1.0, 2.0, 4.0, 8.0 and 12.0 cm) and the factor B to four light intensities (100%, 70%, 50% and 30% of the solar light intensity) obtained by the use of agricultural nets. Seed emergency was evaluated daily for a period of 26 days from sowing to obtain the germination percentage and the EVI (Emergence Velocity Index). The plant height and blooming time were also recorded, in addition to the dry mass of plants at flowering. The relevant characteristics of each light intensity treatment, such as air temperature, relative humidity and soil temperature at depths studied were verified The photosynthetically active radiation was also quantified through the use of a quantometer. All results were submitted to variance analysis by F Test and the treatment means were compared by Tukey test at 5% of probability. The plants of U. decumbens, U. plantaginea, C. echinatus, A. australe, S. occidentalis, S. obtusifolia, R. raphanistrum, I. grandifolia, I. quamoclit and E. heterophylla emerged in sowing depth up to 12.0 cm, while plants of U. humidicola and D. tortuosum did not emerged at 12.0 cm depth with a light intensity lower than 50% and 70%, respectively. Plants of S. rhombifolia did not emerge in 12.0 cm depth on full light condition. Shading increased the time to flowering of all species evaluated ...