Two Resistant Responses in Cowpea Induced by Different Strains ofXanthomonas campestrispv.vignicola

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Abstract
Twenty-eight cowpea cultivars and plant introductions were identified as resistant to bacterial blight and canker. Two types of resistant responses were observed and characterized. The first response was a rapid confluent necrosis, typical of a normal hypersensitive response, and was expressed against incompatible fluorescent pseudomonads and most strains of Xanithomonas campestris pv. vignicola. The 2nd response was represented by a brown-red discoloration without complete collapse of the tissue. The brown-red reaction was expressed against 2 strains of X. campestris pv. vignicola as well as all other pathovars of X. campestris that were isolated from a variety of hosts other than cowpea.

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