Submitted to: National Fusarium Head Blight Forum Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 11/1/2004
Publication Date: 12/11/2004
Citation: Zhang, X., Jin, Y., Dill-Macky, R., Anderson, J. 2004. Proceedings of the 2nd International Symposium on Fusarium Head Blight. December 11-15, 2004. Orlando, Florida. Interpretive Summary:
Technical Abstract: The use of resistant cultivars in wheat will be one of the major components in managing Fusarium Head Blight (FHB or scab). Systematic screening of spring wheat germplasm in the USDA National Small Grain Collection was initiated in 1998. Diverse sources of resistance have been identified in the spring wheat germplasm. Continued efforts are being made to identify additional sources of resistance, and to characterize and introgress resistance into adapted germplasm. This report summarizes the research approaches and progress in the 2004 spring wheat germplasm screening project. In 2004 materials at different stages of FHB screening were planted in multiple and inter-related nurseries (field and greenhouse) following Zhang et al. (2000) with some modification. The newly introduced materials were planted in non-replicated single-row plots and evaluated for FHB reaction in the Preliminary Screening Nursery (PSN). Materials selected from 2003 FHB nursery were planted in the Elite Germplasm Nurseries (EGN). The EGN entries were planted in single row plots with two replicates/location. The EGN materials were blocked based on year of selection and maturity groups within year of selection. The primary FHB screening nursery was in St. Paul, MN. Materials entering third year EGN were also planted in a FHB screening nursery in Crookston, MN. The St. Paul nursery was inoculated with a macroconidial suspension twice starting at anthesis. The Crookston nursery was inoculated with Fusarium-colonized corn kernels. The nurseries were mist irrigated until disease assessment. In 2004, a total of 384 accessions of spring wheat, originated primarily from Russia, eastern Europe, and Heilongjiang and Sichuan provinces of China were planted in the PSN nursery. The EGN consisted of 254 entries, with 105 accessions selected from the 2001 PSN, 64 accession selected from the 2002 PSN, 85 accessions from the 2003 PSN. Thirty accessions were selected as putative sources of resistance from the PSN. Severe lodging occurred in the St. Paul nursery and it was not harvested, thus the usefulness of the data from the 2004 St. Paul field nursery will be limited. The Crookston nursery was hand-harvested. Disease index and VSK of the third year screening materials will be presented. Field selections were screened in the greenhouse by single floret inoculation. Similar to our previous findings, many of the lines exhibiting moderate resistance in the field were highly susceptible to point-inoculation in the greenhouse.