dc.contributor | Restrepo Diaz, Hermann | |
dc.contributor | Gabriel, Garcés Varón | |
dc.creator | Pantoja Benavides, Alvaro Daniel | |
dc.date.accessioned | 2022-08-23T14:48:37Z | |
dc.date.accessioned | 2022-09-21T16:17:36Z | |
dc.date.available | 2022-08-23T14:48:37Z | |
dc.date.available | 2022-09-21T16:17:36Z | |
dc.date.created | 2022-08-23T14:48:37Z | |
dc.date.issued | 2022-08-21 | |
dc.identifier | https://repositorio.unal.edu.co/handle/unal/82016 | |
dc.identifier | Universidad Nacional de Colombia | |
dc.identifier | Repositorio Institucional Universidad Nacional de Colombia | |
dc.identifier | https://repositorio.unal.edu.co/ | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/3391038 | |
dc.description.abstract | El incremento en las temperaturas globales que se ha venido presentando a lo largo de las últimas décadas está afectando los diferentes procesos fisiológicos y bioquímicos de las plantas. Muchos de los cultivos han disminuido sus rendimientos, entre ellos el arroz, el cual ha presentado disminuciones en su rendimiento entre un 6% a un 7%. Se ha observado que la aplicación exógena de diferentes reguladores de crecimiento (fitohormonas), particularmente el uso de auxinas (AUX), giberelinas (GA), citoquininas (CK), y brasinoesteroides (BR) han mostrado potencial para mitigar los efectos de diferentes tipos de estreses abióticos y bióticos en diferentes especies cultivadas, pero en el caso arroz bajo estrés térmico combinado no se ha estudiado al respecto. El objetivo de este trabajo fue evaluar el efecto de la aplicación exógena de diferentes reguladores de crecimiento sobre plantas de arroz expuestas a una condición de alta temperatura diurna y nocturna. En este contexto, se desarrollaron cuatro experimentos, el primero se llevó a cabo en condiciones de invernadero y cámaras de crecimiento el cual tuvo como finalidad conocer cuáles de los reguladores de crecimiento evaluados lograba mitigar los efectos negativos del estrés térmico combinado en diferentes variables fisiológicas y bioquímicas; el segundo y tercer experimento evaluaron que número de aplicaciones de los dos reguladores de crecimiento con la mejor respuesta en el experimento anterior se debía utilizar para mitigar los efectos negativos del estrés térmico combinado en condiciones de invernadero, casa de mallas y cámaras de crecimiento; y el cuarto utilizó la información de los experimentos anteriores y se evaluó en que etapa fenológica (floración o llenado de grano) dichas aplicaciones mitigaban los efectos del estrés térmico combinado en condiciones de casa malla y cámaras de crecimiento. Para esto se evaluaron variables fisiológicas como la fotosíntesis, conductancia estomática, transpiración, uso eficiente del agua, temperatura foliar y parámetros de la fluorescencia de la clorofila en la hoja. Además de variables bioquímicas como el contenido de prolina, producción de malondialdehido y contenido de clorofilas. Adicionalmente para el último experimento las características de la panícula. Los resultados indicaron que: i) El estrés térmico combinado causó afectaciones negativas en plantas de arroz. Lo anterior se evidenció en una menor conductancia estomática, fotosíntesis, transpiración carbono intracelular, CRA, contenido de pigmentos fotosintéticos (clorofila y carotenoides), variables de fluorescencia de la clorofila α, incremento del NPQT y MDA.; ii) El uso de reguladores de crecimiento mitigó los efectos del estrés térmico combinado en las plantas de arroz. Además, la aplicación de estos reguladores de crecimiento generó una respuesta fisiológica positiva lo cual se reflejó en aumento en los valores de conductancia estomática, fotosíntesis, transpiración carbono intracelular, CRA, contenido de pigmentos fotosintéticos (clorofila y carotenoides), variables de fluorescencia de la clorofila α, acumulación de prolina y una reducción en la peroxidación de lípidos (MDA) y del NPQT.; iii) Los mecanismos fisiológicos y bioquímicos medidos ayudaron a ampliar nuestro conocimiento sobre el mecanismo de tolerancia al estrés por calor en genotipos de arroz cultivados en regiones tropicales.; y iv) El uso de reguladores de crecimiento es una herramienta útil en el manejo de condiciones de estrés por calor severo en cultivos de plantas de arroz cuando se esperan períodos de altas temperaturas. (Texto tomado de la fuente) | |
dc.description.abstract | The increase in global temperatures that has been occurring over the last decades is affecting the different physiological and biochemical processes of plants. Many crops have decreased their yields, including rice, which has shown decreases in its yield between 6% and 7%. It has been observed that the exogenous application of different growth regulators (phytohormones), particularly the use of auxins (AUX), gibberellins (GA), cytokinins (CK), and brassinosteroids (BR) have shown the potential to mitigate the effects of different types of abiotic and biotic stresses in different cultivated species, but in the case of rice under combined heat stress, this has not been studied. The objective of this work was to evaluate the effect of the exogenous application of different growth regulators on rice plants exposed to high daytime and nighttime temperature conditions. In this context, four experiments were developed. The first was carried out under greenhouse conditions and growth chambers, with the purpose to find out which of the evaluated growth regulators managed to mitigate the negative effects of combined heat stress on different physiological and biochemical variables. The second and third experiments evaluated what number of applications of the two growth regulators with the best response in the previous experiment should be used to mitigate the negative effects of combined heat stress in a greenhouse, shade house, and growth chamber conditions. The fourth experiment used the information from the previous experiments and evaluated at which phenological stage (flowering or grain filling) the foliar applications mitigated the effects of combined heat stress in conditions of shade house and growth chambers. For this, physiological variables such as photosynthesis, stomatal conductance, transpiration, efficient use of water, leaf temperature, and chlorophyll fluorescence parameters in the leaf were evaluated. In addition, biochemical variables such as proline content, malondialdehyde production, and chlorophyll content were measured. Additionally, for the last experiment, the characteristics of the panicle also were measured. The results indicated that: i) The combined heat stress caused negative effects on rice plants. This was evidenced in lower stomatal conductance, photosynthesis, intracellular carbon, transpiration, RWC, the content of photosynthetic pigments (chlorophyll and carotenoids), fluorescence variables of chlorophyll α, increase in NPQT and MDA.; ii) The use of growth regulators mitigated the effects of combined heat stress on rice plants. In addition, the application of these growth regulators generated a positive physiological response, which was reflected in an increase in the values of stomatal conductance, photosynthesis, intracellular carbon, transpiration, RWC, the content of photosynthetic pigments (chlorophyll and carotenoids), fluorescence variables of the α-chlorophyll, proline accumulation and a reduction in lipid peroxidation (MDA) and NPQT.; iii) The measured physiological and biochemical mechanisms helped to expand our knowledge on the mechanism of tolerance to heat stress in rice genotypes grown in tropical regions; and iv) The use of growth regulators is a useful tool in managing severe heat stress conditions in rice plant crops when periods of high temperatures are expected. | |
dc.language | spa | |
dc.publisher | Universidad Nacional de Colombia | |
dc.publisher | Bogotá - Ciencias Agrarias - Maestría en Ciencias Agrarias | |
dc.publisher | Escuela de posgrados | |
dc.publisher | Facultad de Ciencias Agrarias | |
dc.publisher | Bogotá, Colombia | |
dc.publisher | Universidad Nacional de Colombia - Sede Bogotá | |
dc.relation | RedCol | |
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dc.rights | Atribución-NoComercial-SinDerivadas 4.0 Internacional | |
dc.rights | http://creativecommons.org/licenses/by-nc-nd/4.0/ | |
dc.rights | info:eu-repo/semantics/openAccess | |
dc.title | Efecto de reguladores de crecimiento en la mitigación de estrés térmico en arroz (Oryza sativa) | |
dc.type | Tesis | |