| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4506674 | Crop Protection | 2011 | 6 Pages |
Sorghum accessions from Uganda were evaluated for grain mold and anthracnose resistance during the 2005 and 2006 growing seasons at the Texas A&M University Research Farm, near College Station, TX. Accession PI534117 and SC719-11E exhibited the lowest grain mold severities of 2.4, whereas, accessions PI534117, PI534144, PI576337, PI297199, PI533833, and PI297210, with SC748-5 were highly resistant to anthracnose in both years. Accessions PI534117, PI297134, PI297156 exhibited low grain mold severities in 2006. Significant negative correlation was recorded between grain mold and percent germination and high temperature in both years. In 2006, daily precipitation recorded significant positive correlation with grain mold. The seed mycoflora was analyzed across sorghum lines and treatments. In 2005, Curvularia lunata and Fusarium thapsinum were the most frequently recovered fungal species with 31 and 21% incidence, respectively, followed by Alternaria spp. (19%) and F. semitectum (13%). In 2006, predominant colonizers were F. thapsinum (58%), followed by Alternaria and F. semitectum with 15 and 10, percent respectively, while C. lunata had a 6% incidence. In this study, PI534117 holds promise for multiple disease resistance, as it had the lowest disease severity of grain mold and was highly resistant to anthracnose in both years. It also has a high germination rate, a high seed weight, and its short stature is more advantageous for the new A-line conversion program.
Research highlights► In this study, inoculation with either the individual fungal species or their mixtures [i.e., F. thapsinum or C. lunata, a mixture of F, thapsinum and C. lunata, or a mixture of Fusarium species (thapsinum, chlamydosporum, proliferatum, semitectum) and C. lunata] did not significantly increase grain mold levels. ► Mycoflora analysis of either inoculated or naturally infected grain mold sorghum seeds revealed that these fungal species F. thapsinum, C. lunata, Alternaria spp, and F. semitectum would be the most important fungal species for evaluating sorghum germplasm for resistance to grain mold in Texas. ► Accessions PI534117, PI534144, PI576337, PI297199, PI533833, and PI297210 from Uganda were highly resistant to anthracnose in both years. ► Accession PI534117 holds promise for multiple disease resistance as it had low grain mold infection and was highly resistant to anthracnose in both years.
