|GILIO, T - Universidade Estadual De Maringá|
|Pastor Corrales, Marcial - Talo|
Submitted to: Bean Improvement Cooperative Annual Report
Publication Type: Trade Journal
Publication Acceptance Date: 3/30/2017
Publication Date: 4/1/2017
Citation: Hurtado-Gonzales, O.P., Gilio, T., Pastor Corrales, M.A. 2017. Resistant reaction of Andean common bean landrace G19833, reference genome, to 13 races of Uromyces appendiculatus suggests broad spectrum rust resistance. Bean Improvement Cooperative Annual Report. 60:27-28.
Technical Abstract: The Andean common bean landrace G19833 (Chaucha Chuga) was used to obtain the first reference genome of Phaseolus vulgaris. G19833 has also been reported as resistant to various pathogens of common bean. However, little is known about the reaction of G19833 to Uromyces appendiculatus, the fungal causal agent of the common bean rust disease. The objective of this study was to obtain the reaction of G19833 to 13 different virulent races of U. appendiculatus. Ten of these races were Mesoamerican and three were Andean. Together, these races overcome the resistance to all 10 named and mapped resistance genes that confer resistance to U. appendiculatus. Remarkably, landrace G19833 was resistant to all thirteen races used in this study. It is significant that the Andean landrace G19833 had broader resistance to U. appendiculatus races than Mesoamerican common bean landraces PI 181996 (Ur-11), Ouro Negro (Ur-14) and PI 310762 (Ur-Unnamed) and Andean landrace PI 260418 (Ur-Unnamed). These four landraces are known to be resistant to all but one race of the more than 80 races of the rust pathogen maintained at ARS-Beltsville. Based on these results, we are developing segregating populations to study the genetics of rust resistance of G19833 and perhaps discover a new Andean gene or genes. Breeding programs have used more rust resistance genes from Mesoamerican beans than genes from the under-utilized Andean beans. Elucidation of the genetic basis of rust resistance in G19833 will be greatly accelerated when combined with the existing abundant genomic resources developed for G19833.