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Evaluation of Selected Sorghum Lines and Hybrids for Resistance to Grain Mold and Long Smut Fungi in Senegal, West Africa

Louis K. Prom, Research Plant Pathologist, USDA-ARS, Southern Plains Agricultural Research Center, Crop Germplasm Research Unit,
2881 F & B Road, College Station, TX 77845 USA ; Ramasamy Perumal, Assistant Professor, Sorghum Breeding, Kansas State University,
Agricultural Research Center, Hays 67601 USA ; Ndiaga Cissé, Sorghum Geneticist, Centre National de la Recherches Agronomique, BP
53, Bambey, Senegal, West Africa ; and Christopher R. Little, Department of Plant Pathology, Kansas State University, Manhattan 66506
Accepted for publication 6 March 2014. Published 20 June 2014.

Abstract Grain mold in sorghum [Sorghum bicolor (L.) Moench] is a major
problem worldwide. Damage caused by this fungal disease complex
includes a reduction in yield (loss of seed mass), grain density, and
germination. Long smut is another important fungal disease in sorghum
and is a threat to food security in West Africa. Studies identifying
potential sources of resistance for these two diseases in Senegal are
limited. The objective of this research was to assess the vulnerability of
selected breeding lines and hybrids from the United States to grain mold
and long smut in two locations in 2009 and 2010. Four sorghum lines
(Sureno, RTx2911, SC719-11E, and IS18760) and four hybrids (Sorghum
Partners NK6638, Asgrow A571, AN600 × RN610, and Pioneer 83G19)
exhibited low grain mold severity at both locations. The cultivars 3694
and SC748-5 and one hybrid, Novartis 2030/C, were resistant to long
smut infection at both locations. Lines BTx623 and RTx430 were found
to be highly susceptible to long smut, and therefore the available
commercial sorghum hybrids involving these two parental lines’ genetic
backgrounds are likely to be vulnerable to long smut. There are no
differential responses between lines and hybrids for both grain mold and
long smut disease severity. None of the lines or hybrids showed resistance
to both diseases.

Prom, L. K., Perumal, R., Cissé, N., and Little, C. R. 2014. Evaluation of selected sorghum lines and hybrids for resistance against grain mold and long
smut fungi in Senegal, West Africa. Plant Health Progress doi:10.1094/PHP-RS-13-0128