Effect ofBurkholderia tropicaandHerbaspirillum frisingensestrains on sorghum growth is plant genotype dependent

Abstract

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 Kosakonia radicincitans strain IAC/BECa 99, Enterobacter asburiae strain IAC/BECa 128, Pseudomonas fluorescens strain IAC/BECa 141, Burkholderia tropica strain IAC/BECa 135 and Herbaspirillum frisingense 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. Burkholderia tropica and H. frisingense 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 Burkholderia tropica strain IAC/BECa 135 and H. frisingense strain IAC/BECa 152 are promising PGPB strains for use as inocula for sustainable sorghum cultivation.

Associative diazotrophic bacteria inoculated in sugarcane cultivars: implications on morphophysiological attributes and plant nutrition

“…In addition to biological nitrogen fixation, many associative diazotrophic bacteria can act in the synthesis of plant growth, regulating substances, and other processes (Santi et al, 2013;Chaves et al, 2015;Schlemper et al, 2018). The production of indole acetic acid (IAA) by the strains used in our study (G. diazotrophicus, H. seropedicae, H. rubrisubalbicans, B. tropica, and A. amazonense) was recently reported by Chaves et al (2015).…”

“…The increased micronutrient uptake by crops inoculated with diazotrophic bacteria may be related to several factors. These bacteria can promote the root system growth or lead to changes in its architecture depending on the phytohormone production, increasing the contact surface of the plant with soil nutrients and/or acting in the release of compounds that reflect in the increased availability of nutrients in the rhizosphere (Pii et al, 2015;Dinesh et al, 2018;Schlemper et al, 2018).…”

“…Most of these associative diazotrophic bacteria are also referred to as plant growth-promoting rhizobacteria (PGPR). In addition to the biological N fixation (BNF), some of these bacteria present other benefits to plants, such as the production of plant growth regulator (auxins), solubilization of inorganic phosphates, siderophore production, and/or action as control agents (Carvalho et al, 2011;Santi et al, 2013;Cassán et al, 2014;Pii et al, 2015;Schlemper et al, 2018).…”

Effects of growth‐promoting bacteria on soybean root activity, plant development, and yield

“…The effects of PGPR and their metabolites on soybean root volume and length allowed us to identify combinations of microorganisms that may affect cell division and differentiation, thus leading to changes in root system architecture. This effect was confirmed by Berendsen et al (2015) and by Schlemper et al (2018) in studies on PGPR in Arabidopsis thaliana and sorghum (Sorghum), respectively. The authors observed an increase in the numbers of both root primordia and lateral roots, indicating that root sites and lateral root outgrowth areas were affected by inoculation.…”

“…() and by Schlemper et al. () in studies on PGPR in Arabidopsis thaliana and sorghum ( Sorghum ), respectively. The authors observed an increase in the numbers of both root primordia and lateral roots, indicating that root sites and lateral root outgrowth areas were affected by inoculation.…”