Effect of Burkholderia tropica and Herbaspirillum frisingense strains on sorghum growth is plant genotype dependent

Sorghum is a multipurpose crop that is cultivated worldwide. Plant growth-promoting bacteria (PGPB) have important roles in enhancing sorghum biomass and nutrient uptake and suppressing plant pathogens. The aim of this research was to test the effects of the endophytic bacterial species strain IAC/BECa 99, strain IAC/BECa 128, strain IAC/BECa 141, strain IAC/BECa 135 and strain IAC/BECa 152 on the growth and root architecture of four sorghum cultivars (SRN-39, Shanqui-Red, BRS330, BRS509), with different uses and strigolactone profiles. We hypothesized that the different bacterial species would trigger different growth plant responses in different sorghum cultivars. and significantly increased the plant biomass of cultivars SRN-39 and BRS330. Moreover, cultivar BRS330 inoculated with either strain displayed isolates significant decrease in average root diameter. This study shows that strain IAC/BECa 135 and strain IAC/BECa 152 are promising PGPB strains for use as inocula for sustainable sorghum cultivation.