Evidence of variability in the structure and recruitment of rhizospheric and endophytic bacterial communities associated with arable sweet sorghum (Sorghum bicolor (L) Moench)

Our results suggest that specific bacterial taxa with potential N-fixing capacities are consistently detected in sorghum-created rhizospheric and endophytic environments, irrespective of environmental factor effects

Jean-Baptiste Ramond; Freedom Tshabuse; Cyprien W. Bopda; Don A. Cowan; Marla I. Tuffin

2013

Scholarcy highlights

  • Sorghum is the world‟s fifth most cultivated cereal crop after wheat, rice, maize and barley, with a global production of 60 million tons, and is the second most cultivated cereal grain in Africa after maize
  • Using molecular tools), the soil and endophytic ebacterial community structures associated with Sorghum bicolor L., cultivated in farms from three South African provinces were examined
  • Rhizosphere and rhizoplane communities presented a higher bacterial species richness than the endophytic communities, as previously observed for maize and Populus deltoides associated communities. These results confirmed that rhizospheric environments are “microbial hot-spots” while endophytic communities are relatively low in prokaryote diversity
  • Since endophytic microbial communities are typically characterized by a low taxonomic diversity, and since DGGE is less sensitive than Terminal-Restriction Fragment Length Polymorphism, the polymerase chain reactions products from similar plant-tissue samples were pooled prior to load on DGGE gels
  • The presence ofbacterial taxa reliably associated with sorghum in South Africa is significant as they could be directly used as bio-inoculants, and possibly engineered with enhanced PGP activities to introduce various crop improvements
  • With a worldwide annual growth rate of 10% in the “microbial inoculant” market, the sorghum-specific microorganisms identified in this study have significant potential in agricultural biotechnology as crop improvement tools

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