Morfogénesis en girasol (Helianthus annuus L.) afectada por la aplicación exógena de reguladores del crecimiento vegetal
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Se estudió el efecto de la aplicación exógena de los reguladores de crecimiento vegetal (RCV) N6-Benciladenina (BA), Acido a-Naftalenacético (NAA) y Acido gibérlico (GA3) sobre la morfogénesis en el girasol (Helianthus annuus L). Los RCV fueron aplicados durante el desarrollo incipiente del capítulo, es decir, cuando los primordios florales aún no habían terminado de diferenciarse. Cada planta tratada recibió 45 pg de NAA día⁻¹ durante 10 días, o 45 pg de BA día⁻¹ durante 10 días, o 45 pg de GA3 día⁻¹ durante 5 días. NAA no produjo cambios significativos tanto en el desarrollo del tallo como en la morfología del capítulo. GA3 produjo un aumento en la longitud de los entrenudos y aceleró el desarrollo floral en un 25,0 %. BA fue el que mostró el mayor efecto sobre el desarrollo de las plantas, aumentando la superficie foliar en un 38,0 %, el peso seco del tallo en un 93,0 % y produciendo cambios en la morfología del capítulo y en el desarrollo floral. Las plantas tratadas con BA presentaron un 17,0 % de aumento en el número de primordios florales, el cual se pudo asociar con la significativa expansión de la superficie del receptáculo en una etapa previa.
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