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Pathovar-specific monoclonal antibodies for Xanthomonas campestris pv. oryzae and for Xanthomonas campestris pv. oryzicola



Pathovar-specific monoclonal antibodies for Xanthomonas campestris pv. oryzae and for Xanthomonas campestris pv. oryzicola



Phytopathology 79(3): 322-328



Monoclonal antibodies (mAbs) were produced that were specific for Xanthomonas campestris pv. oryzae. Monoclonal antibody Xco-1 reacted with all 178 tested strains of X. c. oryzae from diverse geographical locations, including strains isolated from the recent blight outbreak on rice in Texas and Louisiana. A second mAb, Xco-2, reacted with most (87%) strains of X. c. oryzae, which included all but one of 92 Philippine strains. A third mAb of X. c. oryzae (Xco-5) reacted only with the 29 strains from Texas and Louisiana, and not with any other strain of X. c. oryzae; however, Xco-5 also reacted weakly with strains of X. c. oryzicola. An mAb specific for X. c. oryzicola was generated. None of the mAbs reacted with 130 xanthomonads of other pathovars and species, including 11 epiphytic xanthomonads from rice leaves, or with 89 strains of other genera. Based on immunofluorescence and immunoelectron microscopy, these mAbs detected surface antigens. The Xco-1 and Xco-2 epitopes were heat-sensitive and heat-resistant, respectively, and the Xco-2 epitope was found in the lipopolysaccharide fraction. Culture conditions were critical for expression of the Xco-5 epitope.

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