Genetic analysis of anthracnose resistance in ‘Pitanga’ dry bean cultivar

Abstract

With 3 tablesAbstractAnthracnose, caused by Colletotrichum lindemuthianum, is a major disease of dry bean and results great yield losses. The objective of this work was to characterize the anthracnose resistance gene present in the Andean cultivar ‘Pitanga’. This cultivar was crossed with the cultivars Michelite, Michigan Dark Red Kidney, Cornell 49‐242, Mexico 222, PI 207262, TU, AB 136, G 2333, BAT 93, SEL 1308, H1 line, Ouro Negro, Jalo Vermelho and Jalo Listras Pretas to obtain F1 and F2 populations. These populations were then inoculated with races 23, 64, 65, 73 and 2047 of C. lindemuthianum. The segregation ratio was 3 resistant : 1 susceptible, which shows that resistance inheritance is controlled by a single dominant gene. The results from allelism tests in fourteen F2 populations fit a 15 resistant : 1 susceptible ratio, which indicates that the resistance present in the ‘Pitanga’ cultivar is dominant and independent from genes and alleles already characterized: Co‐1, Co‐2, Co‐3, Co‐42, Co‐5, Co‐6, Co‐7, Co‐9, Co‐10, Co‐11, Co‐12 and Co‐13. The authors suggest the symbol Co‐14 to represent the gene present in the ‘Pitanga’ cultivar.