|GILIO, THIAGO - Universidade Estadual De Maringá|
|Pastor Corrales, Marcial - Talo|
Submitted to: Bean Improvement Cooperative Annual Report
Publication Type: Trade Journal
Publication Acceptance Date: 3/7/2016
Publication Date: 6/22/2016
Citation: Hurtado-Gonzales, O.P., Gilio, T., Pastor Corrales, M.A. 2016. Unraveling the broad resistance in Common Bean cultivar Mexico 235 to Uromyces appendiculatus. Bean Improvement Cooperative Annual Report. 59:101-102.
Technical Abstract: The Mesoamerican common bean cultivar Mexico 235 (M235) is known to have a broad spectrum of resistance to the hypervirulent bean rust pathogen (Uromyces appendiculatus). This cultivar is resistant to 83 of 94 races of the rust pathogen maintained in Beltsville, MD. These 83 races overcome nine of the 10 named and mapped Ur genes (Ur-3, Ur-4, Ur-5, Ur-6, Ur-7, Ur-9, Ur-11, Ur-12, Ur-13, and Ur-14) as well as other very important sources of resistance including PI 260418, PI 310762, and Compuesto Negro Chimaltenango. The rust resistance in M235 is conferred by the Ur-3 gene and another or possibly two additional rust resistance genes. The Ur-3 gene was originally described in dry bean Aurora (1) which is resistant to only 55 of the same 94 races. Hence, the additional gene(s) in M235 provides resistance to 28 races to which Aurora is susceptible. Although M235 was used as source of rust resistance of many released cultivars, no genetic study has been conducted describing the gene(s) conditioning this resistance. The objective of this study was to conduct an in-depth analysis to elucidate the complex rust resistance of M235 using differential races of U. appendiculatus on a F2 segregating population.