Submitted to: National American Phytopathology Meetings
Publication Type: Abstract Only
Publication Acceptance Date: May 7, 2010
Publication Date: June 1, 2010
Citation: Funnell-Harris, D.L., Pedersen, J.F., Sattler, S.E. 2010. Soil and Rhizosphere Populations of Fluorescent Pseudomonas spp. Associated with Field-grown Plants are Affected by Sorghum Genotype. Phytopathology 100: S37-S38 Technical Abstract: Sorghum [Sorghum bicolor (L.) Moench] is valued for bioenergy, feed and food. Potential of sorghum genotypes to support differing populations of root- and soil-associated fluorescent Pseudomonas spp. or Fusarium spp., in two soils, was assessed. Pseudomonads and Fusarium spp. were assessed from roots and soil of field-grown sorghum along with biological control traits including hydrogen cyanide (HCN) and 2,4-diacetylphlorogluconol (phl) production. In dryland field conditions, RTx433 roots had greater numbers of pseudomonads than Redlan before anthesis but similar numbers after. There were no differences in numbers of pseudomonads from dryland soil or roots or soil of irrigated plants. Percentages of HCN-producing root isolates and phl soil isolates declined on irrigated Redlan plants, but percentages of HCN-producers increased in dryland conditions. Redlan roots had greater percentages of Fusarium isolates in the Gibberella fujikuroi species complex. Results indicated that sorghum genotype affected rhizosphere populations of fluorescent Pseudomonas spp. and Fusarium spp. across soil environments.