Different pathotypes were defined among the 26 isolates and differential cultivars were proposed to define the pathotypic composition of Xam populations in three ECZs in Colombia. A highly significant interaction was also detected when cultivar behaviour was rated as area under the disease progress curve (AUDPC) after stem inoculation. The stem inoculation technique was selected as a method for resistance screening of cassava cultivars for bacterial blight resistance. Cultivar × isolate interaction was highly significant (P < 0♰01) after stem inoculation, but not after leaf inoculation. Leaf inoculation and stem puncture were used in order to detect possible specific interactions between cultivars and isolates. A set of 26 Xam isolates from three edaphoclimatic zones (ECZs) in Colombia was selected for inoculation on a set of 17 potential cassava differentials. Although Colombian isolates of Xam differ in DNA polymorphism and pathogenicity, no suitable host differentials have been identified to demonstrate physiological specialization. manihotis (Xam) is a destructive disease occurring in most cassava growing-areas. Cassava bacterial blight, caused by Xanthomonas axonopodis pv.
0 Comments
Leave a Reply. |