Different soaking times and niacin concentrations affect yield of upland rice under water deficit conditions
Diferentes tiempos de remojo y concentraciones de niacina afectan el rendimiento de arroz de tierras altas bajo condiciones de déficit hídrico
DOI:
https://doi.org/10.15446/agron.colomb.v37n2.72765Keywords:
Oryza sativa L., vitamin B3, biostimulant, abiotic stress, seed priming (en)Oryza sativa L., vitamina B3, bioestimulante, estrés abiótico, condicionamiento de semillas (es)
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this grain have great importance. The objective of this study was to evaluate the influence of rice seed immersion in a niacin solution on plant development, physiology and production. The
treatments were defined by a combination of two immersion times for the seeds (12 h and 24 h) in four niacin concentrations (0.00, 100, 200 and 300 mg L-1) distributed in five replicates. Characteristics relating to seedling emergence, plant vegetative
development, relative indices of chlorophyll and grain yield were evaluated. We verified that the immersion of the seeds for 12 h gave higher relative indices of chlorophyll, whereas immersion for 24 h increased the speed of emergence and the number of tillers and panicles. The doses of niacin positively affected the relative chlorophyll indices and the production characteristics, up to a maximum concentration of 172.57 mg L-1. We concluded that the immersion of rice seeds for 24 h increased the speed of seedling emergence, leaf number, and panicles per area. However, the relative indices of chlorophyll in leaves decreased. The use of niacin promoted the numbers of spikelets per panicle, fertility of the spikelets and the weight of 1000 grains, besides increasing the relative index of chlorophyll in the leaves of rice plants.
vegetativo y productivo del arroz de tierras altas sometido la
inmersión de las semillas en niacina. Los tratamientos se definieron por la combinación de dos tiempos de remojo (12 y 24 h) en cuatro concentraciones de niacina (0.00, 100, 200 y 300 mg L-1), distribuidos en cinco repeticiones. Se evaluaron las características relacionadas con la emergencia de las plántulas y el desarrollo vegetativo de las plantas, los índices relativos de
clorofila y el rendimiento de grano. Se verificó que la inmersión de las semillas durante 12 h proporciona índices relativos más altos de clorofila, mientras que la inmersión durante 24 horas aumenta la velocidad de emergencia, el número de macollas y
panículas. Las dosis de niacina afectaron los índices relativos de clorofila y las características de producción positivamente, hasta la concentración máxima de 172.57 mg L-1. Se concluyó que la inmersión de las semillas de arroz durante 24 h aumenta la velocidad de emergencia de las plántulas, el número de hojas
y las panículas por área. Sin embargo, los índices relativos de
clorofila en las hojas disminuyen. El uso de niacina promueve
ganancias en el número de espiguillas por panícula, la fertilidad
de las espiguillas y el peso de mil granos, además de aumentar
el índice relativo de clorofila en las hojas de las plantas de arroz.
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