Tratamento de sementes com fosfito de manganês e enxofre: efeitos na soja e no desenvolvimento de fitopatógenos

Abstract

With the growing world population and possible climate change that can be observed in the coming decades, there are major concerns related to the production of soybean system, making it necessary to develop techniques that promote sustainability. Seed treatment has great potential to be developed in soybeans and is used in order to promote initial protection of plants against various plant parasites organisms and environmental stresses, as well as providing in some cases physiological effects that promote grain production increase . Thus, the aim was to use of manganese and sulfur phosphite (FMnS) for seed treatment and evaluate its effects on the development of soy and plant pathogens. The experiments were performed in Unit 2 of the Federal University of Grande Dourados, with the Agricultural Microbiology Laboratory of Phytopathology FCA-UFGD located in the municipality of Dourados - MS. We evaluated the germination, emergence, early development, nodulation and behavior under water stress of plants grown from seeds treated with isolated FMnS or in combination with fungicides. We also performed experiments in order to verify the in vitro effect of FMnS on fungi Sclerotinia sclerotiorum, Rhizoctonia solani, Colletotrichum truncatum and Macrophomina phaseolina and seed treatment in the presence of C. truncatum and S. sclerotiorum. It was concluded that the use of FMnS seed treatment although affect plant emergence, promoted increase in shoot dry weight, dry weight of root and root zone of plants grown in ideal conditions of water availability; no deleterious effects to the plant symbiosis with bacterium nodulation; promoted in vitro control of S. sclerotiorum, R. solani, C. truncatum and M. phaseolina; and promoted a lower incidence of C. truncatum and S. sclerotiorum on soybean seedlings.