Abstract
This study was conducted to determine the reactions of 19 sorghum lines, of which 18 had been used for Colletotrichum sublineola pathotype determination to other foliar and panicle diseases in two agroecological zones in Niger. The anthracnose resistant check SC748-5 was infected with leaf blight, oval leaf spot, and zonate leaf spot but free of long smut, rough leaf spot, and target leaf spot. BTx623 and TAM428 which are susceptible to anthracnose were infected with leaf blight, long smut, oval leaf spot and zonate leaf spot. Across locations, all the lines tested were infected with leaf blight, caused by Exserohilum turcicum. PI570726, an accession from Sudan was infected with only leaf blight but free of all the other diseases observed in both locations. This work showed that some of the sorghum anthracnose differentials, especially PI570726 may possess genes for resistance to multiple sorghum diseases and can be utilized as parents in breeding programs in Niger.
Highlights
In the drier regions of Africa and Asia, sorghum (Sorghum bicolor (L.) Moench) supplies the daily calorie intake for hundreds of millions of people [1]
In Africa, sorghum cultivation is integral to the lives of millions of people where the grain and plant parts are utilized in baked foodstuff, porridge, snack foods, nonalcoholic and alcoholic beverages, fiber, and syrup, among other uses [1, 7]
Sorghum cultivation and profitability are hampered by biotic stresses due to fungal and other microorganisms [1, 13]
Summary
In the drier regions of Africa and Asia, sorghum (Sorghum bicolor (L.) Moench) supplies the daily calorie intake for hundreds of millions of people [1]. This study was undertaken to determine the responses of the set of sorghum differentials used to delimit the anthracnose pathogen races to natural disease infection in two locations in Nineteen sorghum germplasms, including the 18 differentials SC326-6, SC414-12E, BTx378, TAM428, Tx2536, SC328C, QL3, BTx398, SC283, Brandes, SC112-14, Theis, BTx623, SC748-5, PI570841, PI570726, PI569979 and IS18760 that had been used to establish Colletotrichum sublineola pathotypes in the United States and Puerto Rico [10] were evaluated for foliar and panicle diseases in two regions, Tillabéri and Maradi in Niger.
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