|Fourie, Deidre - ARC, SOUTH AFRICA|
Submitted to: Bean Improvement Cooperative Annual Report
Publication Type: Research Notes
Publication Acceptance Date: October 1, 2005
Publication Date: February 1, 2006
Citation: Miklas, P.N., Fourie, D. 2006. Halo blight resistance in host differential cultivar ZAA 12 is conditioned by three major gene loci. Bean Improvement Cooperative Annual Report. 49:69-70. Technical Abstract: Halo bacterial blight caused by Pseudomonas syringae pv. phaseolica (Psp) is a serious seed-borne disease limiting common bean production worldwide. Genetic resistance provides the most effective means for combating this disease. Our objective was to study the inheritance of halo blight resistance in ZAA 12 which is the most resistant host differential cultivar conditioning resistance to 7 of 9 differential races of the pathogen. Preliminary results for the inheritance of halo blight resistance in ZAA 12 (A43) support the findings of Teverson (1991) that: i) two independent dominant genes Pse-3 and Pse-2 condition resistance to Races 3 and 4, and ii) two independent dominant genes Pse-4 and Pse-2 condition resistance to Race 5. A new finding from this study is that a single gene Pse-2 (or gene cluster) conditions resistance to Races 2, 7, 8, and 9. The recessive gene pse-5 described by Teverson (1991) has not been observed in tests conducted thus far. If pse-5 is present in ZAA 12 then it must be tightly linked with Pse-2 gene. Available (I gene and SW13 SCAR, and SB10 SCAR for Pse-3) and newly developed markers linked with the genes will be generated and used to further study and confirm the inheritance of halo blight resistance in ZAA 12 and other sources.