|Vidigal filho, P|
|Pastor corrales, Marcial - Talo|
Submitted to: Crop Science
Publication Type: Peer reviewed journal
Publication Acceptance Date: 6/1/2008
Publication Date: 6/1/2008
Citation: Goncalves-Vidigal, M.C., Vidigal Filho, P.S., Pastor Corrales, M.A. 2008. A New Anthracnose Resistance Gene in Andean Common Bean Cultivar Jalo Listras Pretas. Crop Science. 49:133-138. Interpretive Summary: Anthracnose is one of the most widespread and economically important diseases of common bean worldwide. Planting anthracnose resistant beans offers the most effective strategy to manage anthracnose. However, the highly variable anthracnose pathogen has many different strains that may render susceptible a previously resistant bean cultivar. Bean cultivars that combine anthracnose resistance genes from beans with Andean and Mesoamerican origin provide the best option for durable resistance to anthracnose. However, for a long time, only one Andean anthracnose gene has been available. We present here Jalo Listras Pretas, an Andean common bean cultivar that has a new gene for anthracnose resistance. This gene will make it possible to broaden the narrow genetic base of the bean crop and to develop new combinations of Andean and Mesoamerican resistant genes to effectively protect the bean crop from anthracnose. This information will be of particular use to bean breeders.
Technical Abstract: Anthracnose is one of the most widespread and economically important diseases of common bean worldwide. Most anthracnose resistance genes in common bean are from beans of the Mesoamerican gene pool. The resistant reaction of the Andean common bean cultivar Jalo Listras Pretas to races 9, 64, 65 and 73 of Colletotrichum lindemuthianum, suggested that it had different alleles than Co-1 and Co-12, the only described anthracnose resistance alleles. The objectives of this study were to determine the inheritance of anthracnose resistance in Jalo Listras Pretas and to demonstrate through allelism tests that Jalo Listras Pretas has a new Andean anthracnose resistance gene. F2 populations from crosses between Jalo Listas Pretas and Mexico 222 and Cornell 49242 were used to study the inheritance of resistance. The segregation of the F2 populations fitted a ratio of 3R:1S, suggesting that Jalo Listras Pretas carries a single dominant gene. Allelism tests were conducted with F2 populations derived from crosses between Jalo Listras Pretas and MDRK (Co-1), Kaboon (Co-12), Perry Marrow (Co-13), Widusa (Co-15), Michelite (Co-11), Cornell 49242 (Co-2), Mexico 222 (Co-3 ), TU (Co-5 ), AB 136 (Co-6), PI 207262 (Co-43, Co-9), MSU 7 (Co- 7), BAT 93 (Co-9), Ouro Negro (Co-10 ) and Jalo Vermelho cultivars (Co-12). These tests results revealed that the gene present in Jalo Listras Pretas is independent from the all the Mesoamerican and Andean anthracnose resistance genes evaluated here. On the basis of the independence of this gene from those previously characterized, we are proposing the symbol Co-13 to designate the monogenic inheritance observed in Jalo Listras Pretas