PJB-2007-106
PATHOGENIC VARIATION IN PSEUDOMONAS SYRINGAE AND XANTHOMONAS CAMPESTRIS PV. SESAMI ASSOCIATED WITH BLIGHT OF SESAME
SAMINA BASHIR, M. IRFAN UL-HAQUE, TARIQ MUKHTAR*, GULSHAN IRSHAD AND MUHAMMAD ARSHAD HUSSAIN1
Abstract
The role of Pseudomonas syringae pv. sesami and Xanthomonas campestris pv. sesami, alone and combination, was studied in symptoms development of bacterial blight in sesame. Highest leaf infection of 80.6 % occurred in plants inoculated with both the pathogens together as compared to individual inoculations (P. syringae sesami 75.6%) and (X. campestris pv sesami 50%). The control plants remained asymptomatic and continued to grow healthier. Significant variability among the two pathogens was noted on defoliation (5%) and stem infection (47.16%) respectively, in case of combined inoculation as against 38 % and 36.66 % in individual inoculations. Responses in stem infection were similar, although in some cases stem tended to be more susceptible. Highest stem infection (47.16%) was observed for P+X, followed by X. campestris and P. syringae inoculations showing 43.16 and 26.66% infections respectively. Disease progress was initially slow and the plants treated with P. syringae and X. campestris developed small chlorotic and necrotic areas, but it was severe after two weeks when mixture of P+X was used as inoculum. Initially necrotic spots produced by P. syringae were small in size (1-3 mm in length) as compared to by X. campestris (2-4mm in length) but after 4 weeks of inoculation, the necrotic spots coalesced and caused defoliation in both cases.
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