Variation in anthracnose resistance within the Sudanese sorghum germplasm collection
2005
Erpelding, J.E. (USDA-Agricultural Research Service. Puerto Rico (USA). Tropical Agriculture Research Station) | Prom, L.K. | Rooney, W.L.
Three hundred sorghum accessions from the Sudanese germplasm collection were evaluated to assess their response to sorghum anthracnose (Colletotrichum sublineolum). The germplasm evaluation was conducted during the 2002 growing season in Texas, USA and the Commonwealth of Puerto Rico using an augmented, or replicated, control experimental design with artificial inoculation to identify anthracnose resistant accessions. Nearly one half (137) of the accessions showed a highly resistant or resistant response at both locations. Ten accessions conditioned a moderately susceptible response and 13 were susceptible or highly susceptible to the disease. Variation in the disease response between locations was observed for 142 accessions. Twenty accessions that showed resistant reactions in the Commonwealth of Puerto Rico exhibited susceptible reactions in Texas, USA while seven accessions that were resistant in Texas, USA exhibited susceptible reactions in the Commonwealth of Puerto Rico. These results suggest pathotype variation for the pathogen between locations. Genetic variation for anthracnose resistance, or different mechanisms of resistance in the host, may also be present. Therefore, the factors influencing infection response need to be elucidated to efficiently utilize the germplasm. Because of the level of variation and the large number of the resistant accessions observed in the Sudanese collection, this germplasm would be a valuable source for the identification of additional genes for anthracnose resistance
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