Bean rust resistance in the Guatemalan climbing bean germplasm collection

Common bean (Phaseolus vulgaris L.) is the main source of protein, fiber, and iron for Guatemala's poorest households. Bean rust (caused by Uromyces appendiculatus (Pers) Unger) can reduce seed yield up to 100%. There limited information about U. virulence diversity in Guatemala, especially mid-altitude highlands. To address this limitation, 2015, 23 samples were collected Western Guatemalan Highlands characterized as races 63-1 31-1 using differential set. These two races, along with newer race 20-3 found North Dakota, used evaluate reaction 372 climbing accessions from Guatemala. Most resistant: 82% 63-1, 86% 31-1, 90% 20-3. Based on a genome-wide association study (GWAS) 78,754 single nucleotide polymorphisms (SNPs), regions Pv02 (38.13–38.22 Mb) Pv04 (379 kb) associated resistance 20-3; Pv10 (10.71–10.68 11.09 (1.42 63-1; (39.28 (35.92 31-1. The Pv04: 379 kb, 1.42 Mb 39.28 felt close genetic block B-190, containing Ur-5 Ur-14. Moreover, previously unreported factors located Mb), observed population may prove useful improvement. Using these rust-resistant parents crop improvement program will help maintain where pathogen present.