Abstract:
Pathotyping analysis of 50 Xanthomonas oryzae pv. oryzae
(Xoo) isolates from seven West African countries against 18 rice cultivars
was carried out to identify and characterize Xoo virulence. The study
revealed two major pathotypes (Pta and Ptb) of Xoo virulence. Pta has
29 virulence (Vr) Xoo isolates while Ptb has 21 mildly virulence (MVr)
Xoo isolates. Pta has three subgroup pathotypes (Pta1, Pta2 and Pta3)
and Ptb has two subgroup pathotypes (Ptb1and Ptb2). At country level the
study revealed the presence of Pta1, Ptb1 and Ptb2 in Niger, Pta3, Ptb1
and Ptb2 in Benin and Nigeria, Pta1, Pta3 and Ptb1 in Burkina Faso, Pta1,
Pta3, Ptb1 and Ptb2 in Mali, Pta1, Pta2, Pta3, Ptb1 and Ptb2 in Guinea
and Pta1, Pta2, Ptb1 and Ptb2 in the Gambia. The existence of five subgroups
was likely due to mutations and interactions among isolates that originally
constituted Pta and Ptb pathotypes. The study revealed information on
Xoo virulent population structure in West Africa as well as possible Xoo
pathogen migration between these countries and this provide useful information
for selection and deployment of cultivars with durable resistance to BLB
disease in West Africa.
A. Onasanya, M.M. Ekperigin, F.E. Nwilene, Y. Sere and R.O. Onasanya, 2009. Two Pathotypes of Xanthomonas oryzae pv. Oryzae Virulence Identified in West Africa. Current Research in Bacteriology, 2: 22-35.
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