Aplicação de melatonina sobre algodoeiro submetido a regime de alta temperatura

• Ano de defesa: 2022
• Autor(a) principal: Spolaor, Bruna Oliveira Reinheimer
• Orientador(a): Moro, Adriana Lima
• Banca de defesa: Barbosa, Alexandrius de Morais , Macedo, Ana Claudia
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade do Oeste Paulista
• Programa de Pós-Graduação: Mestrado em Agronomia
• Departamento: Mestrado em Agronomia
• País: Brasil
• Palavras-chave em Português: estresse térmico, fotossíntese, produtividade, germinação polén, Gossypium hirsutum.
• Palavras-chave em Inglês: heat stress, photosynthesis, productivity, pollen germination, Gossypium hirsutum.
• Área do conhecimento CNPq: CIENCIAS AGRARIAS::AGRONOMIA
• Link de acesso: http://bdtd.unoeste.br:8080/jspui/handle/jspui/1436

Cotton is an expanding crop in world trade. Its fibers and seeds are used in the manufacture of fabrics, human and animal food. On the other hand, the crop shows a drop in yield when exposed to high temperatures. The melatonin biomolecule, the melatonin biomolecule (high temperature, however, can increase and increase its productive potential). Activation of the antioxidant system, protection of the photosynthetic apparatus, increase in germination and promotion of rooting are some of the already known characteristics of melatonin (honey). The objective of the present work was to evaluate the effects of exogenous application of melatonin on the germination and reproductive process of cotton under high temperature and field conditions. In the first and second phases, the design was completely randomized, double factorial (melatonin doses x high and ideal temperature (38º/28º and 30º/20º), with 10 replications. In the first phase, germination, honey was applied to seeds of cotton at doses of 0.0, 50 and 100 µM, with a high temperature regime (day and night), followed by germination test, radicle length and dry matter mass evaluation. phenological phases, with a high regime (38º/28º) in the F1 phase for seven days, with later renewing the normal (30º/20º). melatoninized blocks in the B1 and F1 phase of bolls, plant height and productivity. Data were selected for analysis of variance and model means by Tukey's test (p <0.05). In germination tests, the dose of 50 µM mitigates the effects of heat stress damage, potential promoting germination and plant development, promoting biomass gain and root length. Likewise, the same test way in cotton plants, biochemistry and high temperature production in physiology, bio and high temperature plant production in Fittron physiology, the second untested temperature in fittron cotton, the second test way in fittron cotton, the second production of phyto cotton plants, biochemical and high-temperature production in cotton. Improvement in apparatus, plant accumulation, reduction in production grain damage, improvement in germination in pollen grain drop and increase in oxidation, in photos and development of occasional sugar structures, increasing temperature oxidizing high rate regime. In gain, melaton, in increasing plant length, increased boll production, consequently, in fiber and cottonseed productivity. The application of latonin application provides a mitigation of the thermal effects, improving the performance of the culture under the hostile condition, improving the performance of the culture under the hostile condition, increasing the balance capacity and biochemical performance and productivity gain.