Erpelding, J.E.
(2010)
Field Assessment of Anthracnose Disease Response for the Sorghum
Germplasm Collection from the Mopti Region.
American Journal of Agricultural and Biological Sciences, 5 (3).
pp. 363-369.
Abstract
Problem statement: Sorghum anthracnose (Colletotrichum sublineolum) is a highly
variable pathogen and new sources of host plant resistance are required for the development of
resistant sorghum varieties. Germplasm collections are an important source of host plant resistance
and screening germplasm will be essential to identify new sources of resistance. Approach: The
sorghum (Sorghum bicolor) collection from the Mopti region of Mali was inoculated with
Colletotrichum sublineolum and evaluated for foliar anthracnose disease response in Isabela, Puerto
Rico during the 2004 and 2005 growing seasons using a partially balanced lattice design with three
replications. Results: A resistant response was observed for 45 of the 97 accessions in the collection
and mean infection severity for the 52 susceptible accessions was 27.6%. An association was
observed between resistance and the administrative district where the germplasm was collected.
More than 50% of the accessions from the Bandiagara and Bankass districts showed a resistant
response. The lowest frequency of resistant germplasm was observed for the Mopti district with 25%
of the accessions showing a resistant response. The susceptible accessions from the Mopti district,
however, showed the lowest mean infection severity. Approximately 44% of the accessions from the
Douentza district showed a resistant response with the susceptible accessions showing the highest
mean infection severity. These results suggest an association between annual rainfall and
anthracnose resistance, with sorghum accessions from drier regions showing greater susceptibility.
Anthracnose resistance also showed an association with sorghum race classification and race guinea
accessions were more frequently resistant as compared to accessions classified as race durra or
durra-bicolor. Conclusion: The results indicated that anthracnose resistant sorghum germplasm is
frequent in the Mopti region of Mali and that ecogeographic origin and sorghum characterization
information can be used to aid in germplasm selection or germplasm acquisition to identify
anthracnose resistant sources.
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