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ARS Home » Plains Area » College Station, Texas » Southern Plains Agricultural Research Center » Crop Germplasm Research » Research » Publications at this Location » Publication #388825

Research Project: Identification of Resistance in Sorghum to Fungal Pathogens and Characterization of Pathogen Population Structure

Location: Crop Germplasm Research

Title: Pathogenic variability of Colletotrichum sublineolum isolates on sorghum differentials under greenhouse conditions in Jimma, Ethiopia

Author
item TSEDALEY, BINYAM - ASSOSA UNIVERSITY
item ADUGNA, GIRMA - JIMMA UNIVERSITY
item LEMESSA, FIKRE - JIMMA UNIVERSITY
item Prom, Louis

Submitted to: Archives of Phytopathology and Plant Protection
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/18/2021
Publication Date: N/A
Citation: N/A

Interpretive Summary: Globally, anthracnose is one of the most important fungal diseases of sorghum, causing yield losses of up to 70% in severely infected fields. Control of this disease can be challenging due to many races in the pathogenic population. Among the isolates tested in the greenhouse, isolate CsAs7 caused the most infection at the beginning and later in the trial among the sorghum lines. PI570726 and SC748-5 were resistant to the isolates and these two lines could be used as good sources of resistance genes for breeding programs for sorghum anthracnose management.

Technical Abstract: Sorghum anthracnose caused by Colletotrichum sublineolum is one of the most destructive diseases affecting sorghum production in Ethiopia. Pathogenic variability of C. sublineolum isolates on some sorghum differentials under greenhouse condition was evaluated in Jimma, Ethiopia. Highly significant (P<0.001) differences among sorghum differentials, C. sublineolum isolates and their interactions on incubation period, aggressiveness, virulence index, virulence, the first and final anthracnose severity assessments, disease infection rate and AUDPC were studied. Among the interactions, the interaction between CsAs7 (isolate from Assosa zone field 7) and sorghum differentials had the shortest mean incubation period (3.5 days), highest first and final anthracnose severity, highest virulence index, fastest disease infection rate and highest AUDPC as compared to others. This isolate showed the most aggressive and virulent reaction than others followed by CsJm5. The interaction of PI570726 and SC748-5 sorghum differentials and all C. sublineolum isolates produce 100 and 80% resistant reactions respectively, and they could be used as good sources of resistance genes for breeding programs for sorghum anthracnose management.