Azospirillum brasilense and jasmonic acid as mitigators of water stress in creole corn plants
Azospirillum brasilense y ácido jasmónico como atenuadores del estrés hídrico en plantas de maíz criollo
DOI:
https://doi.org/10.15446/agron.colomb.v42n2.100956Keywords:
production, resistance, signaling, water stress, growth regulator (en)producción, resistencia, señalización, estrés hídrico, regulador de crecimiento (es)
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The aim of this research was to evaluate the action of Azospirillum brasilense and jasmonic acid as mitigators of water stress caused by various irrigation levels in Creole corn crops. The experiment was conducted in a greenhouse using a completely randomized factorial design consisting of 2 levels of A. brasilense (absence and presence) x 3 doses of jasmonic acid x 3 irrigation depths determined by three evapotranspiration (ET0) multipliers (0.6, 0.8, and 1.0 of the evapotranspiration measured in the crop area). The design included 4 replicates, totaling 72 experimental units. Evaluations were carried out at the R6 physiological maturity stage for number of tassels, tassel branch number, number of leaves on the corn cob, and number of ears per plant. Analysis of variance showed significant difference among the variables studied. The irrigation depth of 0.8 of the evapotranspiration showed significant interactions between A. brasilense and jasmonic acid in reducing water stress in creole corn plants. The results for the irrigation depth 0.6 of the evapotranspiration, with the use of mitigators, showed smaller reductions in stress (11.91% reduction compared to 0.8 of the ET0). The treatment of 10 μmol L-1 jasmonic acid was the most favorable for reducing stress and consequently increasing the productivity of creole corn plants, coming closest to the estimated optimal dosage.
El objetivo de esta investigación fue evaluar la acción de Azospirillum brasilense y ácido jasmónico como atenuadores del estrés hídrico provocado por diferentes niveles de riego en el cultivo de maíz criollo. El experimento se llevó a cabo en un invernadero, el diseño experimental fue completamente al azar en un esquema factorial con dos niveles de A. brasilense (ausencia y presencia) x 3 dosis de ácido jasmónico x 3 profundidades de riego determinadas por tres coeficientes multiplicadores de la evapotranspiración (ET0) (0,6, 0,8 y 1,0 de la evapotranspiración medida en el área del cultivo), con 4 repeticiones, para un total de 72 unidades experimentales. Las variables estudiadas fueron: número de panículas, número de ramas de la panoja, número de hojas en la mazorca de maíz y número de mazorcas por planta. Se realizó un análisis de varianza, en el cual se demostró que hubo diferencias significativas entre los tratamientos para las variables estudiadas. La lámina de riego de 0,8 de la evapotranspiración mostró interacciones significativas entre A. brasilense y ácido jasmónico en la reducción del estrés hídrico en plantas de maíz criollo. Los resultados para la lámina de riego de 0,6 de la evapotranspiración, con el uso de atenuadores, mostraron reducciones del estrés (reducción del 11,91% respecto al 0,8 de la ET0). El tratamiento de 10 μmol L-1 de ácido jasmónico fue el que más se acercó a las dosis estimadas y resultó ser el más favorable para la reducción del estrés y consecuente aumento de la productividad de las plantas de maíz criollo
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