Obtaining wild sunflower (Helianthus annuus L.) plants for bioassays with herbicides

 

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Autores: Cisneros-López , Ma. Eugenia, Valdez-Hernández, Miguel Ángel, Ortiz-Chairez, Flor Elena, Espinosa-Ramirez, Martín, Garza-Cedillo, Rubén Darío, Galicia-Juarez, Marisol
Formato: artículo original
Estado:Versión publicada
Fecha de Publicación:2024
Descripción:Introduction. The wild sunflower or polocote (Helianthus annuus L.) is the main annual weed in the cultivation of sorghum and corn in northern Tamaulipas, Mexico. To date, there is little information about this species to carry out bioassays with herbicides. Objetive. Establish a methodology for obtaining polocote seedlings for bioassays with herbicides from seed to multiplication in the nursery. Materials and methods. The polocote seed was collected in January 2023, within the INIFAP Experimental Field, in Río Bravo, Tamaulipas. Afterwards, the initial germination test was carried out on filter paper and viability with Tetrazolium, latency was confirmed due to low germination (12 %) and high viability (86 %). Twelve treatments were used to break it using ethanol (70 %) and water (75, 25), as a control only water, at 5 oC and 20 ºC on paper, filter, cotton and Peat moss in Petri dishes for seven days and then at (± 25 ºC). With the previous results, the nursery phase was established with four schemes with pre-germinated seed transplantation and two with direct sowing. Results. The best treatment to break dormancy was immersion in water at 5 ºC for seven days on cotton with 73 %. The best methods to obtain plants were trays with seedlings and transplanting into black open-air pots with 75 and 50% survival, respectively. The shade inhibited the growth of the plants. Direct sowing, with or without seed prehydration, was unfavorable for germination and emergence. Conclusion. Obtaining wild sunflower seedlings was higher when the seed was subjected to water pre-treatment and subsequent transplanting into trays or open-air bags.
País:Portal de Revistas UCR
Institución:Universidad de Costa Rica
Repositorio:Portal de Revistas UCR
Lenguaje:Español
OAI Identifier:oai:portal.ucr.ac.cr:article/59522
Acceso en línea:https://revistas.ucr.ac.cr/index.php/agromeso/article/view/59522
Palabra clave:seed dormancy
broadleaf weed
prehydration
polocote
latencia
semilla
maleza de hoja ancha
prehidratación