Boersma, J. G., Conner, R. L., Balasubramanian, P. M., Navabi, A., Yu, K. and Hou, A. 2014. Combining resistance to common bacterial blight, anthracnose, and bean common mosaic virus into Manitoba-adapted dry bean (Phaseolus vulgaris L.) cultivars. Can. J. Plant Sci. 94: 405-415. Resistance to common bacterial blight (CBB) is generally absent in dry bean cultivars. In order to transfer CBB resistance into dry bean cultivars grown in Manitoba, crosses were made between CBB-resistant navy bean OAC Rex and susceptible cultivars Black Violet (black bean), AC Pintoba (pinto bean) and Morden003 (an anthracnose-resistant navy bean). The F1 progeny were back-crossed to the recurrent susceptible parents for four generations and selections were made based on inoculation tests and molecular markers. The BC4F3 populations were evaluated in CBB field disease nurseries for 3 yr at Morden, MB, and Harrow, ON. Three of the 114 BC4F3 navy bean lines were shown to have improved resistance to both CBB and anthracnose, whereas approximately 50% of the lines exhibited strong resistance to anthracnose. Meanwhile, 11 black bean and 7 pinto bean lines were selected with resistance to CBB and four of the seven pinto beans were also putatively resistant to bean common mosaic virus (BCMV). There was good agreement between the presence of molecular markers and field resistance to CBB and anthracnose. The resistant lines recovered in this research possess desirable yield potential and seed characteristics, and can be used in crossing for future dry bean improvement.
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Vol. 94 • No. 2