Silício e bioagentes na supressão da brusone foliar em arroz
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2014-02-24
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Universidade Federal de Goiás
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Rice is considered a cereal that has the potential to eradicate hunger and malnutrition. However, during its cultivation, is submitted to biotic and abiotic stresses, which lowers productivity in key growing regions, followed by the rising cost of inputs such as fertilizers and pesticides. The aim of this work was to study the effect of silicon, alone and in combination with bioagents on growth promotion and leaf blast suppression of on upland rice. Two experiments, E1 and E2 were conducted in a factorial design in the greenhouse conditions. E1: aimed to select the best treatments for plant growth promotion and rice blast (Magnaporthe oryzae) suppression. It was composed by 5 plots (control; 1 ton SiCaMg.ha-1; 2 ton SiCaMg.ha-1; 4 ton SiCaMg.ha-1; 8 ton SiCaMg.ha-1), 5 subplot (control; Burkholderia pyrrocinia; Pseudomonas fluorescens, Trichoderma asperellum; mixture of all these three bioagents) and 8 replication. E2: aimed to investigate the defense mechanisms of the best treatment selected in E1. It was composed of 2 plots (control; 2 ton SiCaMg.ha-1) and subplot 3 (control; Trichoderma asperellum; mixture of all these three bioagents) and 4 replication. Silicon fertilization and bioagents interaction proved to be promising. In E1, T. asperellum combined with 2 ton.ha-1 of SiCaMg plant fertilization increased 45.63% of plant growth and, the combination of all three bioagents with 2 ton ha of SiCaMg plants fertilization was the best treatment reducing 96% of leaf blast. In E2, the two best treatments in E1 statistically increased QUI, GLU, POX and FAL activity as well AS content in the absence of Magnaporthe oryzae. However, 24 and 48 hours after challenger inoculation with M. oryzae, only QUI and GLU activity and AS content statistically increased in the treatment that combined all three bioagents and 2 ton.ha-1 of SiCaMg plants fertilization. Leaf blast reduction through the activation of defense mechanisms elected the combination silicon fertilization and bioagents as important strategies for sustainable rice disease management.
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SOUZA, A. C. A. Silício e bioagentes na supressão da brusone foliar em arroz. 2014. 48 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2014.