Desempenho agronômico e morfologia radicular de híbridos de sorgo submetidos à inoculação com bactérias solubilizadoras de P, sob condição de restrição hídrica

Abstract

Several strategies have been studied to improve the efficiency of available agricultural resources. Therefore, this work aims to understand what are the influences and benefits that the inoculation of bacteria can provide to grain sorghum hybrids when subjected to water restriction. Two trials were carried out, one in a greenhouse and the other in the field. The treatments consisted of four grain sorghum hybrids submitted to treatments with and without inoculation of phosphorus-solubilizing bacteria (Bacillus subtilis and Bacillus megaterium), in environments with and without water restriction. In the greenhouse test, root system characteristics, chlorophyll content and shoot dry mass were evaluated, while in the field test, flowering, chlorophyll content, chlorophyll fluorescence, stomatal conductance, leaf surface area, diameter of stem, mass of a thousand grains, grain yield and water use efficiency were taken. The inoculation of Bacillus subtilis and Bacillus megaterium bacteria showed no effect on the root and shoot morphology of sorghum hybrids in a water-restricted environment. Root length CR and surface area of 0-1 mm roots did not show reduction in the water-restricted environment and may be important characteristics in the study of drought tolerance. Under field conditions, bacterial inoculation only had an effect on chlorophyll content (TC) at 64 days after sowing and stem diameter.